Window Lock Replacement: Parts, Costs and the Fault Behind the Fault

“Window lock replacement” covers half a dozen different parts — and knowing which one has failed is the difference between a modest fix and paying for hardware you didn’t need. Here’s how the locking side of a window actually works, what each part costs to put right, and when a lock fault is really an alignment fault in disguise. It’s the companion piece to our guide on windows that won’t close or lock.

The Parts That Actually Lock a Window

The locking handle — on most uPVC windows the handle itself holds the key. Lost keys, seized barrels and snapped spindles all end the same way: a new handle, matched by spindle length and step height, supplied with its own keys. The espagnolette — the geared strip inside the sash that drives mushroom cams into keeps when you turn the handle; worn gearing means the handle turns but nothing moves. Shootbolts — rods firing into the frame top and bottom on bigger sashes. Keeps — the frame-side strikers the cams land in; when a window “won’t lock” after settling, it’s often the keeps that need moving a few millimetres, not the lock. Restrictors — child-safety and upper-floor stays, replaceable and worth having on any bedroom window.

Fix the Cause, Not Just the Lock

A window lock that failed at ten years old usually didn’t die of old age — it was worked to death by worn friction stays dropping the sash out of line, so every locking action fought the geometry. That’s why a proper window lock visit checks stays and alignment before fitting anything: renew the lock alone and the same wear starts again the next day. It’s the same principle as doors — mechanism last, alignment first.

What It Costs — Flat and Confirmed Upfront

£85 labour plus parts and VAT — no call-out fee, the same price for emergencies and booked appointments, evenings and weekends included. Window handles, locks, stays and restrictors are modest parts, and doing every faulty window in the house in one visit usually stays inside the same flat labour charge — the cheapest window security upgrade there is. Full details on the window repairs page and the price guide.

Insurance and the Accessible Window

Insurers care about accessible windows: ground floor, above flat roofs, beside drainpipes. Key-operated locks there are commonly expected in policy wording — and a burglary through an unlockable window is an awkward claims conversation. If any accessible window in your home doesn’t lock with a key today, that’s the one to fix first. After a break-in, our burglary repair service secures windows the same visit.

Window Lock Questions, Answered

How much does window lock replacement cost?

A flat £85 labour charge plus the part and VAT. Window locks, handles and restrictors are modest parts, and several windows can usually be done in one visit within the same flat labour charge — the exact figure is confirmed before any work starts.

Can you replace a window lock without replacing the window?

Always. Handles, espagnolette strips, shootbolts, keeps and restrictors are all standard parts that fit into the existing sash and frame. The glass and frame never need to come out for a lock repair.

My window key is lost — do I need a new lock?

Usually just a new handle. Most uPVC window handles lock with a small universal-style key, and a fresh locking handle comes with its own keys. It’s a ten-minute swap once the spindle length and step height are matched.

Are window locks an insurance requirement?

Many policies expect key-operated locks on accessible windows — ground floor and anything reachable over a flat roof or extension. A window that won’t lock, or a lost window key with no spare, is worth fixing before it becomes a claims conversation.

Do you cover window locks outside Nottingham?

Yes — Nottingham, Derby, Mansfield, Loughborough and the villages between, same flat price everywhere, no call-out fee and no distance premium.

Window lock stuck, seized or missing its key? Window repairs covers locks, handles, hinges and mechanisms across Nottingham, Derby, Mansfield, Loughborough and the villages between — same-day where you need it.