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Rugged handheld tablet showing a menu on a workbench beside two key fobs, a laptop, a cable plug and a blue cloth.

Locksmith · London

Straight answers about locks

You do not need to become an expert to make good choices about locks. A little understanding goes a long way. These short pieces give you that: how keys are copied, what a lock grade means, when a repair beats a replacement and how to prepare for the unexpected.

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You asked, we answered

Person holding a removed black lock assembly beside a partly open brown front door with a long black pull handle. — Home Lockout Service, London

Lockout Services

What should I have ready when I call about a lockout?

The address and which door you are outside of, what kind of lock is on it as far as you can tell, and where the key is: inside, lost, broken or simply refusing to turn. Mention whether the door is a rental, whether anyone is inside, and whether the lock is electronic. If you have photo identification on you, say so; if not, say that too so the verification route is agreed before the locksmith arrives. Home Lockout Service

How many keys should a business have, and who should hold them?

Fewer than most businesses think, and every one of them named. Two people who can open, one of whom can be reached on a day off, cover the door. Cleaners and contractors get a key only if they need one and hand it back when the arrangement ends. Write down who has what, collect keys when people leave, and rekey when one does not come back. Interior keys for the cash office or stockroom follow the same rule on a shorter list. Business Lockout Service

Can a new key be made from the two broken halves?

Usually. Laid end to end, the halves show the full set of cuts and identify the blank, and a locksmith reads them with a gauge and cuts a fresh key to those depths on a code machine. That is better than tracing the broken blade on a duplicator, because a worn key copied is a worn key repeated. If a spare or the key code exists, that is used instead. Broken Key Extraction

Can a split jamb be repaired, or does it need replacing?

Many can be repaired. A split along the grain is pressed back together, glued with a two-part wood epoxy and held by a steel repair plate or a boxed strike screwed through it into the stud, so the fasteners reinforce the repair as well as the lock. Missing wood is built up with filler or a fitted piece. A jamb that has pulled off the framing along its length or shattered around the pocket is replaced by a carpenter, with the opening secured until then. Break-In Damage Lock Repair

Hands holding a lock cylinder and a ring of keys above a worn workbench with another cylinder and loose keys. — Lock Rekeying, London

Change or Rekey Locks

How long does a rekeying visit take?

It scales with the number of cylinders and how many need attention beyond pinning. A single deadbolt is a short bench job; a whole house with five or six exterior cylinders, a couple of swaps for mismatched keyways and a set of spares to cut and test takes a good deal longer. Tell the locksmith how many doors you want included when you book, and the visit can be planned realistically rather than guessed at. Lock Rekeying

How do I look after a deadbolt once it is installed?

Very little is needed. Each spring and autumn, lock the door from inside and feel whether the bolt still goes home without the door being pulled; if it hesitates, the door has moved with the season and a small strike adjustment restores it. Whatever lubricant the lock's own maker specifies keeps it smooth, often a dry PTFE or graphite type in the keyway and along the bolt, though some cylinders are meant to be serviced with oil. In winter, wipe road salt off the outside trim to protect the finish. Deadbolt Installation

My deadbolt only locks if I push the door. Will a new lock cure that?

The push is a sign the bolt and the strike pocket are out of line, which is a door and frame matter more than a lock fault. A new deadbolt is welcome if the old one is worn, but the visit also adjusts the strike, deepens the pocket or tightens hinges so the bolt throws freely with the door simply closed. Done together, the door locks with a fingertip and the new hardware works as designed. Lock Replacement & Upgrade

What do I get at the end of the visit?

A lock you have tested yourself from both sides, keys counted into your hand with a spare, any parts that were removed if you want them, and a short written note of what was done: case type, parts replaced, keys made, strike adjusted. For a bit-key lock the locksmith keeps the details needed to cut further keys later. You also get shown where the yearly drop of oil goes. Vintage Mortise Lock Service

Small dark safe with a combination dial on a wooden desk beside a closed laptop and books. — Safe Opening & Combination Change, London

High Security Locks

Is a mechanical dial or an electronic keypad the better choice for a business safe?

Each suits a different way of working. A mechanical dial has no battery to fail and a long service life, but only ever holds one combination at a time. An electronic keypad allows separate codes for different staff and an audit trail on some models, at the cost of needing battery changes. Either can be fitted with a genuinely high security rating; the choice usually comes down to how many people need independent access. Safe Opening & Combination Change

How do I decide between a bigger safe now or upgrading later?

It comes down to how much the amount being stored is likely to grow over the next few years. A safe sized with some room to spare avoids an early repeat visit, while a unit sized exactly for today's needs can be outgrown within a year or two for a growing business. Anchoring and lock work do not change much with size, so the main trade-off is simply the footprint the larger unit takes up in the room. Safe Installation & Servicing

What is bumping, and does this stop it?

Bumping uses a specially cut key that is struck while under light turning pressure, bouncing the pins to the shear line for an instant so an ordinary cylinder opens. It works on many standard pin tumblers. A high security cylinder needs its sidebar released by separately positioned finger or rotating pins at the same moment, and a bump key cannot set those, so the plug stays locked. It is one of the clearest advantages of the upgrade. High Security Locks

Person handling a lock cylinder at a workbench lined with cylinders, keys, small pin trays and blank key tags. — Commercial Rekeying, London

Commercial Locks

What information should I have ready before the locksmith arrives?

A list of the doors and other locks you want included, a copy of the lease or the property manager's contact, every existing key you can find, and a rough idea of who needs to open what. Note which doors, if any, are interchangeable cores and where the control key is. Knowing your quiet hours and who opens up in the morning helps the locksmith plan the order of work and the key handover. Commercial Rekeying

What records should I keep once the system is installed?

The keying chart itself, a log of which key or fob was issued to which person or role, and receipts signed when keys change hands. Together these let the business answer, at any point, who currently holds which level and when it was issued, rather than relying on memory once the locksmith who built the system is no longer involved. Master Key System Design

Can visitors or contractors be given temporary access?

Yes, a temporary credential can be issued for a contractor, a cleaner, or a visitor with its own schedule and, where the system supports it, an expiry so it stops working on its own once the job is done. This avoids handing out a permanent code or a key that then has to be tracked down and collected afterward. Access Control Installation

What should I have ready before the visit?

Knowing the intended use of the room, roughly how many people it holds, whether any doors are already fire-rated, and whether any of them are part of a pair helps the locksmith bring the right devices. If a fire inspector or building official has already given a note about the opening, having that note or its reference number on hand keeps the visit focused on what was actually flagged. Panic & Exit Hardware

Two adults discussing a key fob beside a parked car. — Car Lockout Service, London

Car Keys

Will you need to see identification before opening my car?

Yes, and it is the part of the visit that protects you most. Photo identification matched against the vehicle permit, the insurance card or a rental agreement shows the car is yours to open. The permit carries the owner's name and plate number, so the match is straightforward. Roadside clubs ask their locksmiths for the same check, and every car owner benefits from a trade that asks before it opens. Car Lockout Service

Can the key I lost still start my car?

Until it is erased, yes, because the immobilizer still recognizes its chip. During the programming session the locksmith can remove every key from the car's memory except the ones in your hand, and unpair the old remote as well. After that the lost key is a blade that opens a door at most, and nothing else. If that blade worries you, changing or rekeying every mechanical cylinder it operates, doors and ignition, plus a trunk, tailgate, fuel door or glovebox where the car has one, finishes the job. Car Key Replacement

Does cold weather affect a key fob?

Yes, in a couple of small ways. Battery performance drops in cold temperatures, so a fob that already had a fading battery is more likely to act up on a cold morning, and a proximity system's range can feel shorter in the cold as well. Testing a spare's battery before winter, and keeping a spare battery on hand, avoids being caught out by either. Spare Car Key Duplication

How many fobs can be registered to one vehicle?

This depends on the manufacturer, since each vehicle's memory has a set limit built in, commonly enough for several drivers plus a spare. The visit checks how many the specific vehicle allows and how many are already registered, so a household adding another driver knows whether there is room before a new fob is ordered. Key Fob Programming

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