Walk up to almost any business after a break-in, a lost master key, or a lock that seized on the coldest morning of the year, and the same realization lands: the lock was the cheapest part of the door and the one that decided whether the building was open, secure, and legal that day. On a commercial property the lock is doing far more than keeping honest people out. It controls who moves through the building, it has to let people escape in a fire without hunting for a key, and it has to survive tens of thousands of cycles a year without loosening or jamming.
That is a lot to ask from a piece of hardware most owners never think about until it fails. This guide walks through the real types of commercial door locks, how the grading system works, what the different lock functions actually do, and how Ontario’s egress and accessibility rules shape what you are allowed to install. Whether you run a storefront in Toronto, a warehouse in Mississauga, a medical clinic in Vaughan, or a multi-tenant building anywhere in the GTA, the goal is the same: pick a lock that matches how the door is used, keeps people safe, and does not become a weekly service call.
What is a commercial door lock?
A commercial door lock is heavy-duty locking hardware built for the traffic, security, and code demands of a business or institutional building. It differs from a residential lock in three ways: it is cycle-tested to survive far more daily use, it is graded to a published performance standard, and it is designed to work inside a code-driven system of egress, fire, and accessibility rules rather than just on a single front door.
In practice that means thicker metal, replaceable cylinders, and a mechanism rated for a specific building function. A lock on a busy retail entrance might see two thousand cycles a day between staff, deliveries, and customers. A residential deadbolt would be worn out in months. This is also why commercial locks are chosen as part of the whole opening rather than in isolation, alongside the commercial door hardware that surrounds them, from hinges and closers to exit devices.
The main types of commercial door locks
Most commercial openings use one of a handful of lock families. The right one depends on the door material, how much security you need, and whether people need to get through quickly. Here is how they break down.
Cylindrical (bored) locks
Cylindrical locks, sometimes called bored locks, are the workhorse of commercial buildings. The lock body sits inside a round hole bored through the door face, with a latch running to the edge. You see them everywhere as lever-handle sets on office doors, classrooms, back rooms, and interior corridors. They install quickly, cost less than a mortise lock, and are easy to service or rekey. For most interior commercial doors, a Grade 1 or Grade 2 cylindrical lever set is the practical default.
Mortise locks
A mortise lock is a rectangular lock body that fits into a pocket, the mortise, cut into the edge of the door. It is heavier, stronger, and holds more functions in one case than a bored lock, which is why you find mortise locks on main entrances, hotel rooms, and high-traffic doors that need both a latch and a deadbolt working together. They cost more and take more skill to install, but they last, and the deadbolt-plus-latch combination in a single body is hard to beat for a busy front door.
Storefront and hook-bolt deadlocks
Narrow-stile aluminum glass doors, the kind on nearly every retail storefront, use a different lock entirely. There is not enough room in the thin vertical stile for a standard mortise or bored lock, so these doors take a narrow deadlock, often with a hook bolt or a pivoting deadbolt that throws into the frame. The Adams Rite MS-style deadlock with a roughly one-and-one-eighth-inch backset is the common reference point here. If your storefront glass door will not lock cleanly or the key spins without throwing the bolt, that narrow deadlock is usually the culprit, and it is a specialty of any shop that handles commercial glass door repair and aluminum storefront repair.
Deadbolts
A commercial deadbolt adds a solid bolt that throws deep into the strike, independent of the latch. Single-cylinder versions take a key outside and a thumbturn inside. Double-cylinder versions need a key on both sides, which improves security on doors with glass nearby but raises a real egress problem, since anyone inside needs a key to get out. That trade-off matters in Ontario, and we come back to it in the code section below. One-sided deadbolts exist for back doors that should never be a public exit.
Interconnected locks
An interconnected lock ties a latch and a deadbolt together so that turning the inside lever retracts both at once. It gives you the security of a deadbolt with single-motion egress, which is why it shows up on secondary exits and smaller commercial back doors where a fast, key-free exit is required but you still want a deadbolt for after hours.
Exit devices and panic hardware
On doors serving larger occupant loads and on most fire exits, the “lock” is really an exit device, the horizontal push bar that releases the latch when someone pushes through. Panic hardware and fire-rated exit devices are their own category, sized to the door and tied to the building’s egress plan. They carry locking functions on the outside, from always-locked to keyed access, while the inside always releases with a single push. If your building has push-bar exits, treat them as life-safety hardware, not just locks, and check them against the fire-rated door and exit checklist.
Electrified locking: electric strikes and mag locks
When a lock needs to talk to an access-control system, you move into electrified hardware. An electric strike replaces the fixed strike plate in the frame and releases the latch on an electrical signal, so a card reader or buzzer can let someone in while the door stays mechanically latched. Magnetic locks, or mag locks, use an electromagnet to hold the door shut and release when power is cut, which makes wiring and egress design critical. Electric mortise and cylindrical locks build the electrification into the lock body itself. These options let you buzz in a delivery, log entries, and revoke a lost credential in seconds instead of rekeying, and they pair naturally with automatic door operators on accessible entrances.
Keypad, keyless, and smart locks
Keypad and keyless locks drop the physical key in favour of a code, and smart locks add a phone credential, remote unlock, and an audit trail. For a small office or a shared industrial space, a commercial keypad lock removes the headache of collecting keys when someone leaves. The important caveat is grade and build quality. Plenty of keypad locks sold online are residential-grade under a commercial-looking finish, and they will not survive a high-cycle door. Match the electronics to a commercial-rated chassis and you get convenience without giving up durability.
| Lock type | Where it is used | Security | Notes |
|---|---|---|---|
| Cylindrical (bored) | Offices, classrooms, interior doors | Moderate to high | Fast to install and rekey, cost-effective |
| Mortise | Main entrances, high-traffic doors | High | Latch and deadbolt in one heavy body, long life |
| Storefront hook-bolt deadlock | Aluminum glass storefront doors | Moderate to high | Narrow backset, purpose-built for thin stiles |
| Deadbolt | Back doors, added security | High | Double-cylinder raises egress concerns |
| Interconnected | Secondary exits, small back doors | High | Single-motion egress with a deadbolt |
| Exit device / panic hardware | Fire exits, high-occupancy doors | High | Life-safety hardware, single-push egress |
| Electric strike / mag lock | Access-controlled entrances | High | Ties into card readers, needs egress wiring done right |
| Keypad / smart lock | Small offices, shared spaces | Varies with grade | Keyless codes and audit trail, buy commercial-rated |
Commercial lock grades: what Grade 1, 2, and 3 mean
Commercial locks are rated to performance standards published by the Builders Hardware Manufacturers Association, the body accredited by ANSI to write these benchmarks. The ANSI/BHMA A156 series sets progressive grades for locks and related hardware, and the grade tells you how much abuse the lock is built to take. Grade 1 is the highest level, followed by Grade 2, then Grade 3. According to BHMA’s product grade level documentation, these grades represent tested performance benchmarks confirmed through independent laboratory testing, with Grade 1 being the most durable.
The practical translation matters more than the number. Grade 1 is the standard for heavy commercial and institutional doors that take constant use. Grade 2 covers medium-duty commercial doors, plenty of offices and light retail. Grade 3 is really a residential and light-duty rating that does not belong on a busy commercial entrance, even though it gets sold that way. When someone searches for a “heavy duty commercial door lock,” Grade 1 is what they are describing whether they know the term or not.
| Grade | Duty level | Typical use |
|---|---|---|
| Grade 1 | Heavy duty | Main entrances, schools, hospitals, high-traffic commercial doors |
| Grade 2 | Medium duty | Offices, light retail, moderate-traffic interior doors |
| Grade 3 | Light / residential | Not recommended for busy commercial entrances |
Lock functions: not every lock does the same job
Two locks can look identical and behave completely differently, because commercial locks are built around functions. The function decides which side is locked, whether a key is needed, and what happens when the door closes. Getting the function right is what keeps a storeroom secure while a classroom stays lockable from inside during a lockdown.
| Function | How it behaves | Best for |
|---|---|---|
| Passage | Never locks, latch only | Corridors, doors that only need to latch |
| Privacy | Locks from inside, no key | Washrooms, single-occupant rooms |
| Entrance / office | Lockable from inside or by key, often with a push-button | Main and office doors staff lock at closing |
| Storeroom | Always locked outside, key to enter, free exit | Stockrooms, mechanical and server rooms |
| Classroom | Locked or unlocked by key from outside, free exit | Schools, offices needing lockdown control |
If you have ever been locked out of your own stockroom because the door latched behind you, that was a storeroom function doing exactly what it is designed to do. Matching function to room is one of the quiet decisions that makes a building run smoothly, and it is worth planning at the same time you think through choosing the right commercial door for a new build or renovation.
Keying and access: who holds which keys
A single lock is simple. A building full of them is a system, and how you key that system decides how much of a headache your access becomes. The common options each solve a different problem.
Keyed different means every lock has its own key, which is secure but quickly turns into a crowded key ring. Keyed alike puts several locks on one key, handy for a run of doors one person controls. Master keying is the real workhorse for commercial buildings: individual keys open individual doors, while a master key opens everything, so a manager carries one key and each tenant or department carries theirs. Restricted keyways add a layer of control by making blank keys hard to copy without authorization, which stops the slow leak of unauthorized duplicates that undermines security over years.
Interchangeable core, or IC, cylinders deserve a mention because they change how you handle turnover. With an IC system, a special control key lets you swap the core in seconds, so when an employee leaves or a key goes missing you re-core the affected doors on the spot instead of calling for a rekey or replacing hardware. For a business that hands out a lot of keys, that convenience pays for itself. When a lock does need attention, the fix is often just the cylinder rather than the whole lock, which keeps costs down compared with full repair versus replacement decisions on the door itself.
Locks, egress, and Ontario code
This is where commercial locks stop being a hardware choice and become a legal one. In Ontario, doors in a means of egress generally have to open from the inside without a key, special knowledge, or effort beyond a single motion. The logic is simple: in a fire or emergency, no one should be searching a key ring to get out. That single rule quietly rules out a lot of hardware that looks fine in a catalogue.
The classic conflict is the double-cylinder deadbolt on a glass exit door. It stops someone from breaking the glass and reaching the thumbturn, which is good for security, but it also means anyone inside needs a key to escape, which is a serious egress problem on a required exit. On most public and exit doors, that hardware does not belong there. The safer path is a lock that gives you single-motion, key-free exit while still securing the door after hours, which is exactly what interconnected locks and proper exit devices are for.
Accessibility rules add a second layer. Hardware on accessible doors has to be operable without tight grasping, pinching, or twisting of the wrist, which is why lever handles have largely replaced knobs and why push-pull and paddle hardware shows up on barrier-free entrances. Ontario’s accessibility rules for businesses under the AODA shape these expectations for public spaces, and they connect directly to how wide and how operable your entrances need to be. We cover the clearance side of that in our guides to accessible door width and accessibility requirements for storefront doors.
Fire-rated doors bring their own locking rules. A fire door assembly has to latch positively every time it closes so it can hold back smoke and flame, which means the lock and the closer have to work together and the whole assembly has to keep its listing. Swapping in the wrong lock, or one that does not latch reliably, can quietly void the rating. If your building has rated openings, treat lock changes on them as part of the assembly and check them against the Ontario Building Code fire door requirements. The takeaway across all of this: on a commercial building, the lock you are legally allowed to use is often narrower than the lock you could physically install.
Access control and electrified locking
Once a building grows past a handful of doors, mechanical keys start to cost real money in lost-key rekeys and after-hours lockouts. Access control fixes that by tying locks to credentials you can issue and revoke instantly. The core concept to understand is fail-safe versus fail-secure. A fail-safe lock unlocks when it loses power, which suits doors that must never trap people. A fail-secure lock stays locked when power is cut, which suits doors that must stay secure during an outage. The right choice depends on whether that specific door is part of the egress path, and getting it wrong either strands people or leaves the building open.
Electrified openings also need a request-to-exit sensor or a switch so the system knows a legitimate exit is happening, and mag locks in particular have to release for free egress, usually tied to the exit hardware and to the fire alarm. This is also the layer where tailgating and after-hours entry get solved, especially in shared buildings. Our guide to securing multi-tenant commercial entrances digs into how access control and the right locking hardware keep a lobby secure without slowing down the people who belong there.
Common commercial lock problems and what causes them
Locks rarely fail without warning. They get stiff, they drag, the key gets harder to turn, and then one cold morning they stop. Catching the early symptoms saves you an emergency call. Here are the patterns we see most.
| Symptom | Likely cause | What it usually needs |
|---|---|---|
| Key is hard to turn or sticks | Worn cylinder, dirt, dry pins | Clean and lubricate, or replace the cylinder |
| Latch does not catch the strike | Door sag, misaligned strike, worn hinges | Realign strike, service hinges, adjust door |
| Deadbolt will not throw fully | Frame shift, seasonal movement, bent bolt | Adjust strike or frame, replace bolt |
| Storefront lock spins without locking | Worn or broken hook-bolt mechanism | Replace the narrow deadlock |
| Lever is loose or droops | Internal spring cage worn out | Rebuild or replace the lockset |
| Electronic lock unresponsive | Dead battery, wiring, or board fault | Replace battery, check power and controller |
Notice how many of these trace back to the door, not the lock. A lock that will not latch is often a symptom of a sagging door or worn hinges, which is why a lock problem and a door hinge replacement sometimes come as a pair. If a door has also started to grind or scrape, the alignment issue behind the noise is usually the same one stressing the lock.
Repair, rekey, or replace?
When a commercial lock acts up, you have three moves, and the cheapest one is often enough. Rekeying changes which key operates the lock without replacing the hardware, which is the right call after a lost key or staff turnover when the lock itself is fine. Repair covers worn cylinders, tired springs, and alignment, and on a quality Grade 1 lock a repair or cylinder swap can add years. Replacement makes sense when the lock is obsolete, the wrong grade for the door, damaged beyond a rebuild, or when you are upgrading security across the building anyway.
| Situation | Best move |
|---|---|
| Lost key or staff turnover, lock is fine | Rekey or re-core |
| Sticky cylinder or worn spring on a good lock | Repair or replace the cylinder |
| Wrong grade, obsolete, or damaged lock | Replace with the correct grade and function |
| Security upgrade or access-control rollout | Replace and standardize hardware |
When a lock fails on a door you need working right now, that is an emergency, not a project. A jammed entrance at opening time or a back door that will not secure at closing both qualify for emergency commercial door repair rather than a scheduled visit.
Choosing the right lock for your type of business
There is no single best commercial door lock, only the best lock for a specific door in a specific building. Use type is the deciding factor. Here is how the common GTA business types usually shake out.
| Business type | Typical setup |
|---|---|
| Retail storefront | Narrow-stile deadlock plus pull, often with access control on side doors |
| Office | Grade 1 or 2 cylindrical lever sets, master keyed, keypad on shared entry |
| Warehouse / industrial | Heavy Grade 1 locks on personnel doors, exit devices on egress doors |
| Healthcare clinic | Lever hardware for accessibility, storeroom function on supply and records rooms |
| Restaurant | Panic hardware on exits, durable back-door lock, storefront deadlock up front |
| Multi-tenant building | Access control on common entrances, master-keyed suites, exit devices on stair doors |
The pattern holds across all of them: match the grade to the traffic, match the function to the room, and make sure every exit door still lets people out in a single motion. If you are speccing hardware for a whole building, it pays to plan the locks alongside the doors and frames rather than after, which is part of any well-run commercial door installation.
Maintenance keeps locks out of the emergency category
Commercial locks last far longer with a little routine attention, and the maintenance is not complicated. Most failures we get called for were avoidable with a few minutes of care spread across the year.
| Interval | Task |
|---|---|
| Monthly | Check that latches and deadbolts throw fully, test keypads and readers |
| Quarterly | Tighten loose screws and levers, confirm strikes are aligned |
| Twice a year | Lubricate cylinders with a dry lubricant, clean electronic contacts |
| Annually | Inspect exit devices and fire-door hardware, replace batteries proactively |
One tip that saves cylinders: use a dry, graphite-based or PTFE lubricant rather than an oil-based spray, which attracts grit and gums up the pins over time. And when you lubricate the lock, look at the door too, since a lock on a poorly hung door will keep wearing no matter how well you maintain the cylinder.
Finishes and handing, briefly
Two smaller details come up on every order. Finish is described with BHMA finish codes, so satin chrome is 626 and satin stainless is 630, both common on commercial hardware for their durability and clean look. Handing describes which way the door swings and which side the hinges are on, expressed as left-hand, right-hand, and their reverse variants. Getting the handing wrong means the lever points the wrong way or the lock function lands on the wrong side, so it is worth confirming before ordering. A specialist checks both as a matter of routine when supplying commercial door services, which removes a common source of costly reorders.
What drives the cost of a commercial lock
Owners often ask why one commercial lock costs a fraction of another that looks similar. The price follows the build and the job, not the appearance. Grade is the biggest driver, since a Grade 1 lock is tested to a much higher standard than a Grade 2 or 3. Lock type matters too, because a mortise lock or an exit device carries more material and engineering than a bored lever set. Electrification, keying complexity, finish, and whether the opening is fire-rated all add to it. Then there is the install, which depends on the door material and whether existing prep can be reused. Rather than chase a single number, it is more useful to get an assessment of your actual doors, which is where a walk-through and a free estimate earn their keep.
Not sure which locks your doors need? Our team assesses commercial openings across Toronto and the GTA, matches the right grade and function to each door, and keeps every exit code-compliant. Contact Commercial Door Pros for a free estimate and we will help you get it right the first time.
Frequently asked questions about commercial door locks
What is the best commercial door lock?
There is no single best lock. The best choice is a Grade 1 lock in the type and function that match how the door is used. A busy main entrance often wants a Grade 1 mortise lock, while an interior office is well served by a Grade 1 or 2 cylindrical lever set. Match grade to traffic and function to the room.
What are the different types of commercial door locks?
The main types are cylindrical (bored) locks, mortise locks, storefront hook-bolt deadlocks, deadbolts, interconnected locks, exit devices or panic hardware, electrified locks such as electric strikes and mag locks, and keypad or smart locks. Each suits a different door material and security need.
What is the difference between Grade 1 and Grade 2 commercial locks?
Grade 1 is the highest performance level in the ANSI/BHMA system and is built for heavy, high-traffic commercial and institutional doors. Grade 2 is a medium-duty rating suited to offices and lighter commercial use. Grade 1 locks are tested to withstand far more cycles and force.
What does a Grade 3 door lock mean?
Grade 3 is the lowest of the three performance levels and is really a residential or light-duty rating. It is not recommended for busy commercial entrances, since it will wear out quickly under commercial traffic even if it is marketed as a commercial lock.
What is a mortise lock?
A mortise lock is a rectangular lock body that fits into a pocket cut into the edge of the door. It combines a latch and often a deadbolt in one heavy case, making it stronger and longer-lasting than a bored lock. Mortise locks are common on main entrances and high-traffic doors.
What is the difference between a cylindrical and a mortise lock?
A cylindrical lock installs into a round bored hole through the door face and is faster and cheaper to fit. A mortise lock installs into a pocket in the door edge, holds more functions in one body, and is stronger. Cylindrical suits most interior doors; mortise suits heavy entrances.
What lock do aluminum storefront glass doors use?
Narrow-stile aluminum glass doors use a narrow deadlock, often a hook-bolt or pivoting deadbolt with a short backset around one and one-eighth inches. Standard bored and mortise locks do not fit the thin stile, so these doors need purpose-built storefront hardware.
Are double-cylinder deadbolts legal on commercial exit doors?
Generally no. Doors in a means of egress must open from inside without a key or special knowledge, and a double-cylinder deadbolt requires a key to exit. On required exits, use hardware that gives single-motion, key-free egress while still securing the door after hours.
What does free egress mean for a commercial lock?
Free egress means anyone inside can exit through the door in a single motion without a key, tool, or special knowledge, even when the door is locked to the outside. It is a core life-safety requirement for exits, and it rules out hardware that traps people inside.
Can I put a keypad or smart lock on a commercial door?
Yes, as long as it is commercial-rated and does not interfere with egress. A quality keypad lock removes the hassle of collecting keys after staff changes. Avoid residential-grade electronics on high-cycle doors, and make sure the inside always allows a free, single-motion exit.
What is the difference between rekeying and replacing a lock?
Rekeying changes the internal pins so a different key operates the same lock, without replacing the hardware. Replacing swaps out the whole lock. Rekey when the lock is fine but keys are lost or staff changed; replace when the lock is worn, obsolete, damaged, or the wrong grade.
What is master keying?
Master keying is a system where each door has its own individual key while a single master key opens every door in the group. It lets a manager carry one key for the whole building while staff carry keys only for their own areas. It is standard in most commercial buildings.
What is the difference between fail-safe and fail-secure locks?
A fail-safe electrified lock unlocks when it loses power, suited to doors that must never trap people. A fail-secure lock stays locked when power is cut, suited to doors that must stay secure during an outage. The right choice depends on whether the door is part of the egress path.
How often should commercial locks be serviced?
Check latches and electronic locks monthly, tighten hardware and confirm strike alignment quarterly, lubricate cylinders with a dry lubricant twice a year, and inspect exit devices and fire-door hardware annually. Routine attention prevents most of the failures that turn into emergency calls.
Why does my commercial lock stick or jam in winter?
Cold makes metal contract and lubricants thicken, and a door that sagged slightly over the year will bind harder when everything tightens up. A sticking key or a latch that misses the strike usually points to alignment or a dry cylinder, both of which are simple to fix before they fail completely.
Do fire-rated doors need special locks?
Yes. A fire door assembly must latch positively every time it closes, so the lock has to be compatible with the door’s fire rating and work with the closer to latch reliably. Installing a lock that does not positively latch, or one not listed for the assembly, can void the rating.
Where can I get commercial door locks installed or repaired in the GTA?
Commercial Door Pros installs, repairs, and rekeys commercial locks across Toronto, Mississauga, Vaughan, Oakville, Barrie, Newmarket, and the surrounding GTA, matching the right grade and function to each door and keeping exits code-compliant. Reach out for a free estimate.
Locked out, broken in, or planning an upgrade? From a single seized storefront deadlock to access control across a multi-tenant building, we handle commercial locks the right way. Explore our commercial door services or commercial door repair in Toronto, and call when you need it done fast and done to code.
Editor’s note on images
- Hero / featured – commercial-door-lock-storefront-lever-lockset.jpg, 1376×768, JPEG (q82), stainless lever lockset on an aluminum storefront glass door. ALT: “Stainless steel commercial lever handle lockset on an aluminum-framed glass storefront door.” Higgsfield marketing_studio_image, 16:9. Placement: featured image.
- Inline 1 – commercial-door-lock-types-comparison.jpg, 1376×768, JPEG (q82), mortise body, cylindrical lever set, key cylinder, and storefront deadlock on a workbench. ALT: “Commercial door lock types compared: mortise lock body, cylindrical lever lockset, key cylinder, and storefront hook-bolt deadlock.” Placement: after the lock-types comparison table.
- Inline 2 – technician-installing-electric-strike-commercial-door.jpg, 1376×768, JPEG (q82), technician servicing an electric strike and mortise lock on a hollow-metal door. ALT: “Technician servicing an electric strike and mortise lock on the edge of a hollow-metal commercial door.” Placement: in the Ontario code / electrified locking area.
Images generated with Higgsfield marketing_studio_image (the reliable realistic-photo model), converted to web-optimized JPEG server-side, uploaded with unique lowercase hyphenated filenames, descriptive ALT text, titles, and captions. Suggested designer graphics for a future pass: a labelled commercial-lock anatomy diagram (cylinder, latch, bolt, strike, faceplate), an ANSI/BHMA Grade 1/2/3 comparison chart, and a lock-function decision chart, since AI image models are unreliable for accurate technical labels.
Doors that must stay free for egress usually run exit hardware rather than a lockset. Our guide to panic bars and exit devices explains how a push bar keeps a door secure while letting people out in one motion.
