lock replacement

Lock replacement serves one simple purpose: regaining control of access. After lost keys, a move, an attempted break-in, a lock that sticks, or a worn cylinder, changing the lock lets you start again on a secure footing. In most cases, a mobile locksmith can do the work on-site in 30 to 90 minutes, depending on the type of door, the brand of mechanism, and the condition of the frame.

At Montreal Locksmith, we often see the same scenario: someone comes home late, the key turns poorly, they have to force it a little, and then one morning it does not turn at all. Others call us right after lending a key set to a former tenant, an employee, or a contractor. The right move is not always to replace everything. Sometimes rekeying is enough. Sometimes only the cylinder needs to be changed. And sometimes, yes, the whole assembly needs to be redone to avoid paying twice.

If you first want to see the range of jobs a mobile locksmith can handle on-site, our page on mobile locksmith services gives a good idea of the cases where a full replacement makes sense.

When you really need to change the lock

Replacement is recommended when security or mechanical reliability is compromised. I am talking here about real field cases, not an automatic recommendation.

• After lost or stolen keys. If a key set can be linked to your address or your business, it is better to act quickly.
• After moving. You never know how many copies are still circulating.
• After a separation, a tenant change, or staff turnover. Even if everything went well, you need to regain control of access.
• After an attempted break-in. A forced lock may still work, but be misaligned or weakened.
• If the key catches, spins freely, or gets stuck. The problem may come from the cylinder, the bolt, or the alignment, but at some point replacing it costs less than stacking repairs.
• If the lock is too light-duty for the door. We still see solid doors fitted with a basic mechanism that does not hold up.

In a condo or plex, there is also the issue of the shared locking system. A private unit door can often be upgraded without touching common access points, but the hardware and building rules need to be checked before taking anything apart.

Replace, repair, or reconfigure: what a good locksmith checks first

A real diagnosis takes a few minutes and avoids unnecessary expenses. Before suggesting a replacement, we look at four things: the cylinder, the internal mechanism, the door alignment, and the condition of the strike plate in the frame.

A classic example: the lock seems “finished,” but the real problem is a door that shifted with humidity or frost. The bolt enters the strike poorly, the key binds, and then the client thinks the entire lock needs replacing. In that case, a proper adjustment of the strike plate and latch can solve the problem.

On the other hand, if the cylinder has play, if pins are worn, if the key catches even with the door open, or if the lock has already been drilled, forced, or lubricated with the wrong product, replacement becomes more logical. On some models, only the cylinder is changed. On others, especially cheap or very old locks, the complete kit is the best option.

For situations where the mechanism can still be saved, there are also simpler interventions than a full replacement. We often discuss this with clients who hesitate between changing everything and trying to restore it; our page on lock repair and maintenance helps explain the difference.

How a lock replacement works, step by step

For a standard residential service call, here is how it really goes.

1. Door inspection. We confirm the type of door: wood, steel, aluminum, fire-rated door, condo door, glass commercial door. We measure the center-to-center distance, the backset, the thickness, and check whether the existing holes match the new hardware.

2. Choosing the right hardware. Single deadbolt, keyed handle, mortise, euro cylinder, commercial lock, entry knob, panic bar with exterior cylinder: every door has its own logic. Installing “whatever we have in the van” without checking is the best way to end up with a lock that does not close properly.

3. Removal without damaging the door. We remove the old mechanism, inspect the edge of the door, the screws, the strike plate, and the frame. If holes have been widened or the wood is split, the mounting sometimes has to be redone so the new lock holds properly.

4. Installation and adjustment. We install the new cylinder or new lock, align the bolt, adjust closing pressure, and test several times with the door open and then closed.

5. Handing over the keys and client test. The client tries it themselves. That matters. A lock can seem fine to the technician but still catch during everyday use. We correct it on-site.

6. Security check. We check whether the strike screws are long enough, whether the frame holds properly, whether the door is sagging, and whether nearby hardware creates a weak point.

For a simple front door lock, the job can be done in under an hour. For a multipoint lock, a commercial mortise, or a door that has already been forced, more time should be expected. At night, in an emergency, the process is the same; we just go straight to the problem to secure access quickly.

If you are in a building or neighborhood where quick access matters a lot, our team covers several areas of Montreal with mobile service adapted to residential and commercial emergencies.

Which type of lock to choose without making a mistake

The right choice depends less on the brand than on the door’s actual use.

Residential front door. The most reliable standard is often a deadbolt separate from the handle. If the handle breaks, the main lock remains independent. It is simple, solid, and easy to maintain.

Condo door. A specific format often has to be respected, sometimes with a finish imposed by the condo board. Security can be improved without changing the look of the door, but a compatible model must be chosen.

Back or side door. This is often where weaker hardware is found. Yet these are heavily used entry points. A good moisture-resistant lock is worth it, especially if the door is exposed to frost and de-icing.

Business. Here, we think about durability. A door that opens 50 times a day, rotating employees, the need for controlled copies, sometimes a master key system. A residential lock installed on a commercial door does not last long.

Rental or high-turnover housing. In some cases, it is more practical to choose a cylinder that can be easily reconfigured when occupants change.

We are often asked whether electronic locks are always better. Not necessarily. They can be practical, especially for managing temporary access, but they must be installed properly, powered correctly, and suited to the climate. On a poorly aligned door, electronics will not fix a mechanical problem.

Cost, timing, and mistakes that end up costing more

The price of a lock replacement varies based on three things: the type of mechanism, the difficulty of installation, and the timing of the service call. A standard lock on a door in good condition is done quickly. A forced door, a shifted frame, or an old mortise can require extra time and specific parts.

The best way to avoid surprises is to describe the problem clearly over the phone: residential door or business, whether the lock still works or not, lost key, broken cylinder, attempted break-in, number of doors to handle. A photo often helps confirm the type of hardware before we come out.

The most common mistakes we fix afterward:

• buying a random lock that does not match the existing dimensions;
• reusing screws that are too short in the strike plate;
• tightening the mechanism crooked, which wears out the cylinder very quickly;
• thinking some random spray will “fix” a worn lock;
• waiting after losing keys because “it will be fine for tonight.”

In businesses, the most costly mistake is ignoring duplicate keys still in circulation after an employee or subcontractor leaves. A targeted replacement or cylinder reconfiguration costs less than a security incident or a temporary closure of the premises.

For urgent calls, people often look for a technician who truly comes on-site, not a call center that subcontracts at the last minute. That is exactly the type of service we provide as a Montreal Locksmith, day and night.

After the replacement: what to do right away

Once the new lock is installed, a few simple habits prevent a lot of callbacks.

• Test all keys right away.
• Keep a clear list of who receives a copy.
• Do not leave a key set with a visible address in the car.
• If the door catches, have the alignment corrected quickly.
• Avoid unsuitable lubricants; on some locks, they make dirt buildup worse.

If you manage multiple access points, it is worth standardizing keys or putting a clear plan in place by area. For a business, that prevents an employee from still using an old key forgotten in a drawer. For a rental building, it greatly simplifies turnover between occupants.

And if your problem is not limited to just one door, it is better to mention it when you call. A well-prepared visit often makes it possible to secure everything at once. To book an appointment or request immediate service, you can use our contact us page; in an emergency, calling directly is still the fastest option.