Inside your front door: how your locks actually work

Most people never see the part of the door that keeps them safe. Pick a lock below and the door goes see-through — lift the handle, throw the bolt, open the key safe on the wall. Every part carries a note from Bugsy: the things a locksmith checks before he quotes.

Why your uPVC door handle is stiff (and why the door is fine)

Nearly every uPVC and composite door in Southampton locks with a multipoint mechanism: lift the handle and a single gearbox behind it throws hooks, rollers and a deadbolt down the full edge of the door at once. When that gearbox wears, you feel it long before it fails — the handle gets stiff, then floppy, then one night it will not lift at all, usually in November, usually at ten o’clock. If that is you tonight, here is what to look for in a locksmith at 2am — and yes, I answer.

The bit people are not told: the door stays. I measure the old gearbox, match a like-for-like replacement from the stock in the van, and the door, glass and panels never move. If the door just needs a shoulder to lock, it is often not the gearbox at all — the keeps in the frame have drifted out of line as the house has moved, and that is an adjustment, not a replacement. Either way the price is agreed on the phone before I start — what these jobs honestly cost is in my emergency locksmith price guide.

• Handle lifts but will not lock: gearbox or alignment — both fixable same-day.
• Handle floppy or spinning: the gearbox has let go. Stop using it and ring me before it locks shut.
• Key turns but the door will not open: do not force it — a jammed multipoint can usually be opened without damage.

The cylinder: what I fit as standard, and the anti-snap upgrade

The euro cylinder is the only part of a uPVC or composite door the outside world can touch, so it is the part every quote should be clear about. Most doors leave the factory with a basic, unrated barrel — no Kitemark, no star, nothing hardened — and that is what a bargain quote usually puts back in. I do not fit those. I fit two levels, and I will tell you on the phone which one your door is getting.

Either way the door itself is untouched: a cylinder swaps in minutes, and I carry both levels in the van. If your insurer names a lock standard, it is usually BS 3621 on timber doors and TS 007 or SS312 on uPVC and composite — check your own policy wording, then ring me and I will match it. The stars, Kitemarks and codes are all set out in plain English on the lock standards explained page, there is a longer read in anti-snap locks explained, and if you would rather I just looked at the door, the free security check is exactly that.

Wooden front doors: five levers and a Kitemark

On a timber door the main lock lives inside the wood: a mortice deadlock. The one to have is a 5-lever mortice deadlock to BS 3621, with the standard stamped on the faceplate on the edge of the door. Most insurers ask to see BS 3621 on a timber front door — check your own policy wording rather than taking my word for it. If yours is a 3-lever, or there is no Kitemark on the faceplate, the upgrade usually fits straight into the existing slot in the door. The wider picture — which locks insurers name and why — is in the insurance-approved locks guide.

The nightlatch is not the lock

The Yale-type nightlatch is the convenience lock: the door closes behind you, opens from inside without a key. On its own it is not enough for a front door — it belongs above a 5-lever mortice, not instead of one. A modern British Standard nightlatch deadlocks its own latch and snibs from inside, which is a worthwhile upgrade on flats and shared entrances where the nightlatch does more of the work.

And the key safe on the wall

The key safe in the picture is real: a police-approved, mechanical push-button safe, through-bolted into brick, £150 fitted with the certification document handed over for your policy. Carers and family get in; the spare key stops living under the plant pot. The full guide is on the key safes page.

Where I fit all of this

Every lock on this page goes in from the van, same day where I can, across Southampton and the SO postcodes: from our Waterside base out to Blackfield and the rest of SO45, up through the city to Eastleigh and Chandler’s Ford, across to Botley and into the New Forest at Lyndhurst. Why people pick a one-man local firm over a call centre is a fair question with a straight answer on the why choose Keywise page, and the man who turns up is the one on the About Bugsy page — PCC Community Volunteer of the Year 2024, as it happens.

Common questions