Replacing a flat's front door lock: what to check first

Is the flat's front door part of the building's shared system

Many Tallinn buildings, especially newer developments and renovated Soviet-era blocks, use an entry system where each flat's door is fitted with a cylinder that matches a master key held by the building or management company. This lets a caretaker or emergency services get in without every resident holding a separate key.

If your building has this kind of system, fitting an ordinary cylinder from a hardware shop will disconnect your door from it. That is not forbidden, but it is worth knowing before you do it, particularly if the master key is used for lift maintenance access, post, or fire safety checks.

If you are not sure whether your building has a shared system, ask whoever manages the building, or look at the existing cylinder: a master-keyed system is usually stamped with the manufacturer's system name and is not something you can buy over the counter.

Does the apartment association need to know about a lock change

For an ordinary flat you own, changing the lock on your own front door is your decision and does not usually need the korteriühistu's permission. The door leaf itself, and anything structural around it, may be a different matter, but the lock and cylinder are normally treated as part of your own fittings.

The exception is exactly the shared-system case above: if the building's rules or house order specify a common access standard, swapping to an incompatible lock without telling anyone can leave the caretaker unable to reach your flat in an emergency, or leave you unable to get post through a shared system.

A short message to the management company or board, saying you have changed the lock and offering a spare key if that is the building's practice, avoids any confusion later and costs nothing.

If the flat is rented, who is responsible for the lock

If you rent, the lock is normally the landlord's property even though you use it daily. Changing it without asking is usually not a good idea: most tenancy agreements expect you to hand the flat back in the state you received it, and an unannounced lock change can look like exactly the kind of change that breaches that.

The common and sensible approach is to tell the landlord before changing anything, particularly after losing a key or ending a relationship with a previous flatmate, and to agree who pays. Landlords are usually reasonable about this if there is a genuine security reason, and many will simply ask for a spare key afterwards.

If a landlord refuses to act on a broken or unsafe lock, that is worth raising directly and, if needed, checking against the tenancy agreement or with the Consumer Protection and Technical Regulatory Authority, rather than acting alone.

Which lock suits the existing door

The door leaf and frame usually decide what you can fit, more than personal preference. A standard wooden door in an older building often takes a mortice lock with a simple cylinder, while a steel security door bought in the last fifteen years usually has a multi-point locking mechanism that needs a matching manufacturer's cylinder rather than a generic one.

Measuring before buying saves a wasted trip: the cylinder length either side of the handle, the backset (distance from the door edge to the centre of the lock), and the brand of the existing mechanism if it is visible on the faceplate. A mismatched cylinder will not sit flush and can jam the door shut.

If the whole door is failing rather than just the lock, for example the frame is warped or the multi-point mechanism itself is worn, it is usually more sensible to look at a full door installation than to keep patching an old lock.

• Note the cylinder length on each side of the handle
• Measure the backset from the door edge to the lock centre
• Check the faceplate for a manufacturer or system name
• Decide if it is a single lock or part of a multi-point mechanism
• Take a photo of the whole door if unsure what to ask for

How quickly can a lock be replaced, and at what time

A straightforward lock replacement is often a same-day job, and for a genuine lock-out we can usually come the same day, including outside normal working hours, since we are on call around the clock for urgent jobs. Fitting the new lock itself typically takes under an hour once the locksmith is on site.

For non-urgent work, it is worth bearing the building's quiet hours in mind: drilling or forceful work on a shared stairwell door is better scheduled in the daytime rather than late evening, out of consideration for neighbours, even if there is no formal restriction on the work itself.

An appointment can be cancelled free of charge up to 24 hours ahead, so booking a convenient slot rather than waiting for an emergency is usually the cheaper route if the lock is simply worn rather than broken.

Fitting it yourself or calling a locksmith

A simple cylinder swap on a standard door is within reach for most people with a screwdriver and twenty minutes, provided the replacement cylinder is the right size and type. It is one of the more forgiving DIY jobs in a flat.

Where it stops being straightforward is a multi-point security mechanism, a door that has swollen or dropped slightly on its hinges, or any situation where you are locked out and need entry without damaging the door. In those cases a locksmith is faster and less likely to leave you with a door that does not sit right afterwards.

Lock replacement starts at 60 € per job, with a call-out fee of 25 € within Tallinn that is deducted from the bill if the work goes ahead; general odd jobs and adjustments around a door are billed from 39 € an hour. If the door itself needs replacing rather than just the lock, that is a separate job priced from 120 €.