Metro Detroit locksmith work.

The questions below come straight from the calls and texts our dispatchers field every day from customers across Metro Detroit. They are written to help you make a good decision before you hire any locksmith — not just us.

The locksmith industry in Southeast Michigan has more than its share of bad actors. Walk through any consumer-protection bulletin from the Michigan Attorney General's office or the Better Business Bureau's Metro Detroit chapter and you will find the locksmith trade consistently in the top ten complaint categories — usually right next to roofing contractors and tow-truck operators.

The single most important filter is the company name. A real locksmith gives you a business name on the phone, and the same name appears on the truck, the paperwork and the invoice. If a locksmith answers with a generic phrase like "locksmith service," refuses to give you a company name, or sends someone whose paperwork shows a different name, hang up and call someone else. Our name and number are on every page of this site, and you are welcome (encouraged, really) to ask us anything before you book.

The second filter is how the phone call goes. There are only so many ways a residential lockout, a rekey, or an automotive key replacement can play out, and a competent dispatcher asks the right questions and can explain what the job involves after a one-minute conversation. If someone offers a teaser service-call price with the promise that everything else will be worked out on arrival, you are talking to a lead-aggregation operation, not a locksmith. The final bill will be whatever the contractor on your driveway thinks they can extract. Walk away from these calls before the technician shows up; once a truck is on the way the pressure to pay something to make them leave is real and they know it.

The third filter is the company's street address and review pattern. Real locksmith shops have a physical address that matches their service area, a long review history with photos and named technicians, and a phone number that, when you call it during normal business hours, is answered by a person who knows the trade. A locksmith whose Google profile is a residential apartment, whose reviews are all five stars from accounts that have reviewed nothing else, and whose phone routes to a national 800-number is — at best — a marketing operation flipping calls to subcontractors. The work might still get done, but the accountability is gone the moment a problem comes up.

The fourth filter is hardware brand and method of entry. Ask the dispatcher how the technician plans to open your lock. A real locksmith will name a method: picking, bumping, shimming, manipulation, or non-destructive bypass. A scam operation will dodge the question or say "we will figure it out on site." Ask, also, what brand of lock you have and what the technician knows about it. If they can name a few common Kwikset, Schlage, Yale, or Baldwin model lines and describe the difference between them in plain language, they are real. If they cannot, they are not.

What drives the cost deserves one more paragraph. A lockout is mostly time and skill, and the time of day matters. A rekey depends on how many cylinders you have. A smart-lock install depends on the lock and the door. Automotive work depends on the year, make and model. None of this requires a technician on your driveway to work out: a good dispatcher asks these questions before any truck rolls. If they cannot, ask why, and consider that an answer in itself. For a price on your job, call (313) 236-4558.

For commercial customers a slightly different filter applies. You want a locksmith who can produce a one-page proposal with parts itemized by manufacturer and model, labor lines, warranty terms, and the company name on the letterhead. The proposal should be signable as a purchase order or a small services agreement. If your locksmith of choice cannot produce that document on request, they are an emergency-only contractor and you need a different vendor for planned commercial work — master-key planning, access-control installs, multi-door rekeys, panic-hardware retrofits. The same locksmith may be excellent at after-hours lockouts and unsuitable for ten-door commercial buildouts; those are different skill levels and the marketplace rewards specialization. We do both — but we are honest about the difference, and we are happy to recommend other reputable Metro Detroit shops for the rare job that is outside our wheelhouse.

Clear paperwork is the fifth filter and the one most customers forget about. Ask for a plain description of the job before work starts and a written invoice when it ends, with the company name, the technician, the parts and the work performed. Paperwork protects you in the small percentage of cases where something genuinely goes wrong on the job: a damaged door, a stripped frame, a key broken in a way that requires hardware replacement. It also tells you who was in your home (locks contain a lot of trust, and a locksmith with access to your home has had access to a great deal of it). The honest shops put everything in writing without being asked. The scam operations will get vague or hang up.

Last filter: written guarantees. The locksmith trade has labor and parts warranties exactly like any other building trade. Reputable shops guarantee labor for at least 90 days against workmanship issues and pass through the manufacturer's warranty on hardware — typically 1 year for entry-level locks, up to lifetime mechanical for premium hardware. If a locksmith cannot describe their warranty in plain language, or if "all sales final" appears anywhere on their invoice, that is a tell. Real shops back their work because they expect to be in business in five years and they expect you to call them again. Scam operations expect you to never call them again. Their paperwork reflects it.

If you apply all five filters (a real company name, a straight answer on the phone, a real local address, named methods of entry and hardware knowledge, and clear paperwork with a written warranty) you will eliminate the vast majority of the bad actors before any truck arrives. There are several reputable shops in Metro Detroit and we are happy to be compared to any of them. What no honest shop can match is a teaser lead-generation ad, because the number in the ad is not a real number and the company behind it is not a real locksmith. We hope this guide saves you from learning that the expensive way. Call any locksmith, including us, with these questions ready, and the conversation will be short.

A short word on after-hours work. Roughly one in three locksmith calls in Metro Detroit comes in between 9pm and 6am, and the after-hours premium is one of the most-abused line items in the trade. An honest after-hours charge reflects the real cost of having a technician out at night. It should be explained on the phone before a truck is sent, and it should never be an escalation that surprises you on the invoice. If you call a locksmith at 2am and the dispatcher cannot explain the after-hours charge before sending a truck, the conversation should end there. The premium is real; the gouging is not.

On drilling: a competent locksmith opens almost every residential lock without drilling. Drilling is the technique of last resort — used for high-security cylinders that resist picking, locks with a deliberate anti-bypass design (Medeco, Mul-T-Lock, Abloy Protec), or locks that have been damaged from previous failed entry attempts. A typical Kwikset, Schlage, or Yale residential lock should never need to be drilled. If a locksmith arrives at a standard residential lockout and immediately reaches for a drill, they are either undertrained or running a scam. The drill destroys the lock and forces a hardware sale. Ask, on the phone before the truck rolls, whether drilling will be required. If the answer is "maybe" for a standard residential cylinder, call another locksmith.

On automotive work: car keys are a different trade than building locks. The skills overlap but only partly. Modern transponder keys, proximity fobs, and push-to-start systems require manufacturer-specific programming equipment and a current subscription to a key-programming database. Not every locksmith carries that equipment. A locksmith who does not specialize in automotive will often subcontract the work or refer you to a colleague who does — that is the honest response. A locksmith who insists they can program any car key without asking you the year, make, and model is bluffing. The right answer to "can you make me a key for a 2021 Honda Civic with push-to-start" is "yes, we have the AKL programmer for that platform, the all-key-lost procedure for a 2021 Honda takes about ninety minutes onsite, and we'll need the VIN before we roll." If you get vaguer answers than that, find an automotive locksmith.

On safes: safe work is the most specialized end of the locksmith trade and the area where the most underqualified work happens. Real safe technicians belong to the Safe and Vault Technicians Association (SAVTA) and have invested in dialer scopes, change-key kits, and manipulation experience that takes years to develop. A locksmith who shows up at a residential gun safe and immediately starts drilling the dial is, again, choosing destruction over skill — the safe will work after the drill but the relocker will be triggered, the boltwork will need replacement, and the bill will be far higher than manipulation would have been. If you have a safe to open and the locksmith on the phone cannot describe a non-destructive opening approach, call someone else. SAVTA maintains a public directory and most large metros have at least one qualified safe technician.

On smart locks: the smart-lock category has matured a great deal since the early Yale and Kwikset Bluetooth experiments. A modern Wi-Fi or Matter smart lock from August, Yale Assure, Schlage Encode, Level, or Aqara is genuinely a better lock for most homes than a basic deadbolt — fewer keys to manage, audit logs that tell you when each family member came home, the ability to give the dog walker a code that only works on Tuesdays from 10 to 11. But the installation is unforgiving. A smart deadbolt that is mounted on an out-of-square door, or driven through a strike plate that does not align, will run its motor against resistance every time it engages, drain its batteries in weeks, and eventually strip its drive gear. A real locksmith installing a smart lock will adjust the strike, plane the door if needed, set the bolt throw precisely, and walk you through the app pairing. A scam locksmith will hand you the lock half-installed and leave. Ask what the install includes before the truck rolls.

On rekeying: rekeying is the technique of changing the pins inside an existing lock so that the old key no longer works and a new key does. It usually costs far less than replacing the lock, because only the pins change. It is also faster, less invasive (no door modification), and just as secure when done correctly. After buying a home, after a roommate moves out, after losing a key, after a contractor returns the loaner — rekeying is almost always the right answer. Replacement is only necessary when the existing lock is damaged, has reached end-of-life on its mechanical wear, or is being upgraded to a different security grade. A locksmith who insists on replacement for every job is either undertrained on rekey procedure or running a hardware-sales scheme. Either way, the work costs you more than it should.

On master-key systems: a master key system is a careful pinning design that lets one master key open every lock in a building while individual change keys open only the locks assigned to them. It is the single most useful security tool for any business with multiple employees and multiple zones — managers carry the master, employees carry their change keys, the cleaning crew carries a sub-master that opens only common areas. Designing a master system is engineering work, not a quick job. The locksmith needs a floor plan, a list of access groups, a count of doors per group, and a plan for future growth. The pinning charts are then computed (often with software) and the cylinders are pinned to the chart. A locksmith who can produce a master-key chart and walk you through it is a real commercial locksmith. A locksmith who promises to "just master all the locks together" without producing a chart is going to give you a system with security holes — keys that open more than they should, or change keys that accidentally open each other's locks (a defect known in the trade as a "cross-key"). Ask to see the chart before any work begins.

On access control: the commercial access-control market has consolidated in the last five years around a handful of cloud-managed platforms. Brivo, Avigilon Alta (formerly Openpath), Kisi, Verkada Access, and Salto KS dominate the small-to-mid-business segment. Each platform has tradeoffs — Brivo has the longest install base and the most integrations; Alta has the cleanest mobile credential experience; Kisi has the simplest pricing; Verkada bundles cameras and access on one pane of glass; Salto KS works with offline-capable battery-powered locks for buildings without wired infrastructure. The locksmith you hire for access-control work should be a certified installer for at least one of these platforms and should be able to explain the others honestly — including telling you when your building is a better fit for a competitor's product than the one they sell. A locksmith who only sells one platform and dismisses all others is selling, not consulting. We work with several platforms and pick the right one for the building.

On warranties and recalls: the lock industry has occasional recalls and frequent silent revisions. A Kwikset SmartKey cylinder from 2008 is not the same lock as a Kwikset SmartKey cylinder from 2022 — the keyway has been hardened, the bumping-resistant features have been redesigned, and the warranty terms have been tightened. A locksmith who is current with the industry will know which hardware revisions to install in your home, which legacy products to avoid (the original 2008 SmartKey is bypassable in under a minute with a screwdriver — a fact the manufacturer eventually acknowledged), and how to file warranty claims with the manufacturer on your behalf when something fails. If you bought hardware online and want it installed, ask the locksmith if they will honor the manufacturer warranty through their account. Many will, because dealing with the manufacturer directly as a consumer is painful.

On finishes and matching: hardware finish is one of the most-asked questions on remodel jobs and one of the more frustrating ones in practice. The industry uses BHMA codes for standard finishes — 605 is bright brass, 606 is satin brass, 612 is satin bronze, 613 is oil-rubbed bronze, 619 is satin nickel, 625 is bright chrome, 626 is satin chrome, 716 is dark bronze powder coat — and the same code from two different manufacturers will not look identical. Schlage's 619 looks slightly different from Yale's 619 because the underlying alloy and the finishing process differ. If you are matching new hardware to existing locks in a home, bring a sample to the locksmith or have them order matching samples first. Returns on installed hardware in the wrong finish are at the locksmith's discretion and rarely possible.

On lock grades and what they actually mean: the ANSI/BHMA grade system runs from Grade 3 (light residential) to Grade 1 (commercial-duty). The grade is determined by lab-testing the lock against three criteria: cycle count (how many open-close cycles before failure), strength (how much force the lock resists before destruction), and durability (corrosion, vandalism, abuse). A Grade 1 deadbolt has been tested to 250,000 operating cycles, 360 pounds of static load on the bolt, and ten strike-impact tests at 75 foot-pounds. A Grade 3 deadbolt has been tested to a tenth of that. The price gap between a Grade 3 Kwikset at the big box store and a Grade 1 Schlage at a locksmith supply is small; the difference in real-world security is much larger. Buy the Grade 1.

On weather and environment: Southeast Michigan winters are hard on outdoor hardware: freeze-thaw cycles, road salt tracked onto steps and porches, and the occasional Detroit wind event do real damage over a decade. Brass and stainless-steel cylinders outlast zinc-die-cast cylinders by a factor of two or three in a Metro Detroit winter. If your front door takes the weather head-on or sits next to a salted walk, ask your locksmith for solid-brass or stainless hardware on the exterior locks. The premium is small and the lifetime is long.

On hardware sources: a real locksmith stocks hardware from a wholesale distributor and passes through the manufacturer warranty. A scam locksmith carries cheap aftermarket clones, often counterfeit, that look like name-brand hardware but fail within a year. Ask, when the technician arrives, where the hardware was sourced from. Real locksmith inventory comes in branded boxes with intact factory seals and includes a manufacturer warranty card. Loose hardware in unbranded plastic bags is a tell. Counterfeit hardware is widespread on overseas marketplaces and a meaningful share of bargain-priced "Schlage" or "Kwikset" locks sold online are not authentic.

On the second opinion: if a locksmith on your driveway names a number that surprises you, you can decline the work and call another shop. You are not obliged to accept a job just because the truck rolled. The first locksmith may still bill you for the visit, and that is the cost of a second opinion. It is almost always worth paying. A locksmith who refuses to leave without payment for work you declined is crossing a line; if it happens to you, call your local police non-emergency line.

On scope creep: a locksmith arrives for a lockout, opens the door, then suggests rekeying every lock in the house, replacing the deadbolt, adding a smart lock, and upgrading the strike plates. Some of those suggestions may be legitimately useful; some are upselling. The honest way to handle this is for the locksmith to complete the original job, present the additional recommendations separately and in writing, with no pressure to accept, and leave. If the upsell becomes high-pressure, the locksmith has crossed a line. You are allowed to say no, pay for the original job, and have the technician leave. Document the interaction in writing afterward — a short email summarizing what happened — and consider filing a complaint with the Michigan Attorney General's consumer protection team if the pressure was severe. The trade polices itself in part through these complaints; honest locksmiths benefit when scam operations are reported.

Worth mentioning one more time: our phone is (313) 236-4558. Our shop is in Metro Detroit. Whether or not you end up hiring us, we hope you take this guide with you. The next time you need a locksmith in Metro Detroit, ask the questions above. The trade is full of good people; you just have to know how to find them.

The locksmith trade has its own vocabulary and most of it never makes it onto the invoice in a form a homeowner can understand. Here is a short, opinionated glossary of the terms we use most often on the phone and on the truck. If you are calling around, knowing these terms will make every conversation shorter and every answer easier to compare.

Company name: the business name a locksmith gives you on the phone. It should match the name on the truck, the paperwork and the invoice. A generic answer like "locksmith service" is a red flag, because it usually means a call center that will send whoever is cheapest that hour. Ask for the company name before any truck rolls.

Cylinder — the round, removable core of a lock that contains the pins. When a locksmith says "rekey the cylinder," they mean swap the pins inside that round core to match a different key. Most modern deadbolts have an exterior cylinder and an interior thumbturn. A double-cylinder deadbolt has a key cylinder on both sides — less common in residential because of fire-code concerns about quick exit during emergencies.

Deadbolt — a lock whose bolt is moved by direct mechanical action of the key or thumbturn, with no spring mechanism. The defining feature is that the bolt cannot be pushed back into the lock by force alone. Deadbolts are graded by ANSI/BHMA — Grade 1 is commercial-duty, Grade 2 is heavy residential, Grade 3 is light residential. The grade tells you how many cycles the lock is rated for and how much kick-in force it will resist. Spend the money on Grade 1 or Grade 2 for any door that opens to the outside.

Keyway — the shape of the slot in the lock that accepts a particular key blank. Kwikset KW1, Schlage SC1, and Yale Y1 are the three most common residential keyways in Southeast Michigan. A key cut for one keyway will not enter another — this is by design, to prevent key duplication across manufacturer ecosystems. If you have a Kwikset front door and a Schlage back door, you cannot put them on one key without rekeying both locks to a common keyway, which sometimes requires replacing one of the lock cylinders entirely.

Master key — in a properly designed system, a single key that opens multiple locks that each have their own individual change keys. A master-key system has a hierarchy: change keys at the bottom (one per lock), sub-masters in the middle (open a group of locks), and the grand master at the top (opens everything). Designing a master system requires a written pinning chart and careful planning to avoid "cross-keys" — accidental keys that open more than they should. Never let a locksmith master a building without producing the chart first.

Restricted keyway — a key blank that the manufacturer controls distribution of, so that copies cannot be made at a hardware store kiosk. Medeco, Mul-T-Lock, ASSA, and Abloy all sell restricted keyways under various names. The benefit is real key control — the only way to get a duplicate is to contact the original locksmith with proper authorization. The tradeoff is cost and a slightly longer lead time when you do need a new key. For high-stakes residential or any commercial setting with employee turnover, restricted keys are worth it.

Bump key — a specially-cut key that exploits a weakness in pin-tumbler locks by transferring kinetic energy through the pins, briefly aligning them at the shear line and allowing the lock to turn. Bumping became famous around 2005 when videos showing the technique went viral. Modern high-security locks include anti-bump features — spool pins, serrated pins, or a sidebar mechanism — that make the technique nearly impossible. If your front-door lock is more than ten years old and you have not upgraded to a bump-resistant model, it is overdue.

Pick-resistant — a marketing term for locks whose pin design makes picking slow and unreliable. True high-security locks (Medeco, Mul-T-Lock, Abloy Protec, BiLock) have additional mechanical features beyond pin design — sidebars, rotating pins, multi-axis keys — that resist picking for tens of minutes even by trained operators. A "pick-resistant" Kwikset SmartKey is a different category of lock than a Medeco M3 and the cost reflects it. For any door that is your last line of defense, the price difference is worth it.

Strike plate — the metal plate mounted on the door frame that the deadbolt extends into. The strike plate is, surprisingly often, the weakest point in a residential lock installation. Builder-grade strike plates are held in by two short screws into the door jamb — a determined kick will rip them out of the frame within seconds. A proper security strike plate uses four three-inch screws that drive past the jamb into the framing studs behind it, plus a deeper bolt pocket. Upgrading a strike plate takes inexpensive parts and about twenty minutes of labor and is the single highest-leverage residential security upgrade most homes can make.

Mortise lock — a lock body that mounts inside a rectangular pocket cut into the edge of the door, rather than through a round hole bored through the face. Mortise locks are heavier, more secure, and easier to service than tubular cylindrical locks, and they remain the standard for commercial doors and high-end residential. The pocket cut is the limiting factor — a door not pre-cut for a mortise lock requires a router and an experienced installer to retrofit. If your home has a mortise lock, you have a serious lock; treat it well and it will outlast the house.

Transponder key — a car key with a small RFID chip embedded in the plastic head. The chip transmits a unique ID to a receiver near the ignition; the car's computer compares the ID against an authorized list and only allows the engine to start if there is a match. Transponder systems were introduced around 1995 in response to skyrocketing vehicle theft rates and they cut grand-theft-auto numbers dramatically over the next decade. Modern proximity fobs use the same underlying technology with additional encryption and rolling-code features that defeat replay attacks.

AKL — "all keys lost," the automotive locksmith term for the situation where the customer has no working key at all and the technician must program a new key from scratch. AKL procedures are vehicle-specific and require manufacturer programming equipment plus, on many late-model vehicles, a security delay (typically 30 to 60 minutes) before the new key can be enrolled. The delay is anti-theft; there is no way to bypass it. If a locksmith's plan for an AKL job does not account for the security delay, the locksmith has not done this on your vehicle before.

EEPROM — the small non-volatile memory chip inside many car immobilizer modules that stores the list of authorized key IDs. Some older vehicles allow EEPROM-direct programming — the locksmith desolders the chip, reads it, modifies it, and re-flashes it — as an alternative to dealer programming. The technique is fading as manufacturers move to encrypted, sealed modules that resist EEPROM-direct work. For most cars from 2018 onward, dealer-equivalent programming via OBD is the only path and the locksmith must have a current subscription to the manufacturer's security gateway.

Smart credential — a digital key delivered to a phone or wearable, typically over Bluetooth or NFC. The major smart-lock and access-control platforms support smart credentials with varying levels of security and convenience. Apple Home Key and Google Home credentials are now widely supported. Cloud-issued credentials can be granted, revoked, and audited remotely — the operational advantage over physical keys is large for any building with more than a handful of doors or any household with more than a handful of users. The tradeoff is dependency on the cloud platform; choose a vendor with a credible long-term roadmap.

Schlage Primus — Schlage's high-security keyway, used widely in Michigan institutional settings (schools, hospitals, government buildings). Primus keys have a secondary milling on the side of the blade that engages a finger pin in the lock, providing UL 437 listing for pick and drill resistance. Primus is a restricted keyway; duplicates must be ordered through an authorized Schlage dealer with signature authorization on file. For commercial customers wanting institutional-grade key control without the cost of Medeco, Primus is the standard recommendation.

Panic hardware — also called exit devices or crash bars, the horizontal push-bar mechanisms required by fire code on commercial exit doors. Panic hardware must allow egress with a single motion and without prior knowledge of the door operation. Grade 1 panic hardware (the only grade legal on most commercial exits) is rated for at least 1,000,000 cycles. Common manufacturers include Von Duprin, Sargent, Yale, and Detex. Retrofitting panic hardware to an existing commercial door is a precise job — the strike, the door reinforcement, and the closer all need to be reconciled with the new bar. If your commercial building has a panic-bar issue, do not delay; the fire inspector will not.

Electric strike — a strike plate with a solenoid that releases the keeper on command, allowing a door equipped with a regular lockset to be buzzed open from inside the building or via an access-control system. Electric strikes come in fail-safe (locked when power is applied, unlocked when power fails) and fail-secure (locked when power fails) configurations. The choice depends on whether the door is on a life-safety egress path; fire code requires fail-safe on egress, fail-secure is typical elsewhere. A competent locksmith doing access-control work will know the difference and will pull the relevant code section if you ask.

Magnetic lock — a flat electromagnet mounted on the door frame that holds the door closed against an armature plate on the door itself. Maglocks are quieter than electric strikes and can be sized up to 1,500 pounds of holding force. They require continuous power, an REX (request-to-exit) sensor, and fire-alarm tie-in for egress code compliance. Maglocks are not appropriate for every door — they require a flat steel frame to mount on, and they consume noticeably more power than alternatives — but for glass-store-front doors and aluminum-storefront entries they are often the only practical option.

Door closer — the hydraulic mechanism mounted at the top of a door that returns the door to closed after each opening. Door closers are graded by ANSI/BHMA and sized to the door weight; an undersized closer will fail to close the door fully, an oversized closer will slam the door so hard the lock cannot latch. Closer adjustment is one of the most-neglected pieces of building maintenance — a poorly-adjusted closer can leave a door cracked open all night, defeating every lock on the premises. A few minutes of locksmith time to tune the closer is one of the highest-value commercial maintenance calls available.

Pin-tumbler lock — the most common lock mechanism in use globally, invented by Linus Yale Jr. in the 1860s and substantially unchanged since. A row of spring-loaded pins of varying lengths sits above the plug; when the correct key is inserted, the cuts on the key blade push each pin stack to exactly the shear line, allowing the plug to rotate. Pin-tumbler is mechanical, low-power, weather-tolerant, and well-understood. It has known weaknesses (picking, bumping) but the high-security variants address those weaknesses without abandoning the underlying mechanism. The pin-tumbler will outlive every smart lock currently for sale.

Disc-detainer lock — an alternative lock mechanism using rotating discs rather than pins. Disc-detainer locks (Abloy is the most famous manufacturer) resist picking by traditional methods because there is no spring tension on the discs to give the picker tactile feedback. They are common in commercial padlock applications and in some European residential markets. The tradeoff is cost and a smaller dealer network in the United States; if you have a disc-detainer lock you need serviced, find a locksmith who handles them before the lock fails.

Wafer lock — a simpler mechanism using flat wafers rather than round pins, common in low-security applications like file cabinets, mailboxes, and older automotive locks. Wafer locks are easy to pick and easy to impression and should not be relied on for any meaningful security. If you are still using a wafer lock to protect anything valuable, upgrade.

Tubular lock — the round pin arrangement found in coin-operated machines, vending equipment, and some bicycle locks. Tubular locks have a circular pin pattern that, for many years, was considered pick-resistant. A series of inexpensive bypass tools released in the late 1990s changed that picture; a modern tubular lock is roughly as secure as a wafer lock. If your business relies on tubular locks for cash boxes or vending, plan an upgrade.

Bittings — the specific depth pattern cut into a key, expressed as a series of numbers. A typical Schlage key has five bittings, each with a depth from 0 to 9, giving 100,000 theoretical key differs (in practice limited by mechanical-cutting-step constraints). When a locksmith decodes a lock to make a new key, they are reading the bittings; when a locksmith pins a lock to a specific key, they are matching the pin stacks to the bitting pattern. Bitting codes are sensitive information and should never be written on tags attached to keys.

Impressioning — a locksmith technique for making a working key without disassembling the lock, by inserting a blank, manipulating it inside the keyway, and reading the marks the pins leave on the blank. Impressioning is a slower technique than picking but produces a working key at the end — useful when the customer needs a key, not just an open lock. Impressioning is also one of the rarer locksmith skills; it takes years to develop reliably.

Locksmith van inventory — a working locksmith truck carries a deep inventory: blanks for the common keyways, pin kits for major manufacturers, replacement deadbolts in standard finishes, smart locks from two or three brands, automotive transponder blanks for the most-requested vehicles, programming equipment, picks, drill bits, key-cutting machines (manual and code-cutting), and a thousand small parts. A truck stocked to this level can complete most jobs on the first visit. A truck stocked below this level — the typical lead-aggregator subcontractor truck — carries enough to get the door open and not much more. Ask, on the phone, whether the locksmith stocks the part you need. If they cannot answer, they do not.

Service call: the visit itself, a technician driving to you with a stocked truck. What a visit costs depends on the time of day, the distance and the job, and an honest shop explains it on the phone before the truck rolls. A teaser service-call price advertised on a website is a marketing number used to win the click; the real number arrives on the driveway. For a price on your job, call (313) 236-4558.

Written invoice: the document that closes every job. It should list the company name, the technician, the work performed and the parts installed. Keep it for your records, your landlord or HOA, and any warranty claim. A locksmith who will not put the work in writing is telling you something.

Locksmith association memberships — ALOA (Associated Locksmiths of America) and SAVTA (Safe and Vault Technicians Association) are two of the main trade associations for locksmiths in the United States. Membership is not legally required but it is a positive signal: associations require continuing education, enforce a code of ethics, and offer apprenticeship paths. A locksmith with current ALOA membership has invested in their training and reputation in a way that lead-aggregator subcontractors do not. Ask the dispatcher; the question is short.

UL listing — Underwriters Laboratories rates locks, safes, and security hardware against destructive-attack standards. UL 437 is the standard for high-security cylinders; a UL 437 lock has resisted standardized picking, drilling, and pulling attacks for at least ten minutes under laboratory conditions. UL TL-15 and TL-30 are ratings for safes, indicating a working safecracker with tools was unable to open the safe in fifteen or thirty minutes respectively. For most homes a UL 437 cylinder on the front door and a UL RSC (Residential Security Container) rated gun safe are appropriate; commercial environments may need higher ratings. A locksmith who can match the UL rating to the threat model is doing real consulting; one who upsells the highest rating regardless of threat is selling.

Key control — the policy framework around who can request, receive, and duplicate keys for a system. Real key control is a written document, signed by the responsible party (building owner or facility manager), that names the authorized requesters and the duplication rules. The locksmith keeps the signed authorization on file and refuses to duplicate restricted keys for anyone not on the list. Buildings without written key control eventually leak keys to unauthorized parties — former employees, former tenants, former contractors — and the leak is invisible until something goes wrong. A short conversation with your locksmith about key control is one of the most cost-effective security upgrades available for any business.

Pinning chart — the engineering document that specifies which pins go in which positions for every lock in a master-key system. A pinning chart looks like a spreadsheet, with one row per lock and one column per pin position. The cells contain the pin lengths (in the manufacturer's numbering system) and the resulting key bittings. The chart is the locksmith's permanent record of the system; it is also what allows the same system to be expanded or rekeyed years later without redesigning from scratch. Any commercial master-key system without a pinning chart is a system without continuity. If your business has a master-key system and you do not know where the chart is, ask your locksmith to recreate it.

That is the working vocabulary of an Metro Detroit locksmith. If you can use these terms on the phone, the answers you get back will be clearer and easier to compare across shops. If a locksmith stumbles over any of them, you have learned something useful about who you are about to hire.

One last note on the trade. The locksmith industry is older than most of the houses it services. The mechanisms have evolved across centuries — warded locks gave way to lever locks gave way to pin-tumblers gave way to high-security cylinders gave way to smart credentials — but the underlying job is unchanged. A locksmith is the person you call when the system that controls who enters a space has stopped working, or needs to start working differently. The work happens at the boundary between the physical world and the trust relationships of the people who own and use the space. It is a serious responsibility and the locksmiths who take it seriously are the ones worth hiring. Everyone else is selling something else under a locksmith's name. With a little vocabulary and the filters in the buyer's guide above, the difference becomes easy to spot. Thank you for reading. Whether you call us, call another reputable Metro Detroit shop, or fix the problem yourself with the information in these pages, we are glad you came by. Stay safe, lock your doors, and keep a spare key with a neighbor you trust. If a future version of this guide would help you on a more specific topic — commercial access-control selection, automotive transponder programming workflows, master-key planning for multi-tenant properties, or head-to-head smart-lock comparisons across the major brands — let us know on the contact form and we will write it up. The locksmith trade is happy to share what it knows; that is how the honest end of the trade out-competes the scam operations, one well-informed customer at a time. We will keep the writing here updated as the standards, hardware, and software evolve, and we are always glad to hear feedback from readers who spotted something we got wrong or something we should add.