Door Lock Replacement Cost in London: What to Expect

Whether the key's stopped turning, the door won't lock properly any more, or you simply want better security after a break-in nearby, door lock replacement is one of our most common jobs. Here's what it typically costs in London, and the difference between the various parts that can fail.

The three main parts that can fail

Modern uPVC and composite doors use a multi-point locking system, and it's worth understanding the difference between the parts, because they're priced very differently.

• Euro cylinder — the part the key goes into; the cheapest and quickest to replace
• Gearbox/mechanism — drives the hooks and bolts along the edge of the door; a bigger job than a cylinder but still usually a single visit
• Handles — can wear out, become loose or snap off; priced separately from the lock itself

Cylinder replacement

If the key is stiff, difficult to turn, or the cylinder has started to feel loose, this is usually the cheapest fix in door security. It's also a sensible upgrade opportunity — swapping a basic cylinder for a 3-star anti-snap rated one significantly improves resistance to the lock-snapping technique commonly used in break-ins, often for a modest difference in price.

This is a quick job, typically 15–20 minutes, since the cylinder sits within the door edge and doesn't require dismantling the whole lock mechanism.

Gearbox and mechanism replacement

If our uPVC door won't lock guide sounds familiar — the key turns but the hooks and bolts don't engage — the gearbox itself has likely failed. This costs more than a cylinder because the mechanism runs the full length of the door edge and needs to match the exact backset and case size of the original.

This is still normally a single-visit job, with the door tested through several full lock cycles before we leave to confirm everything engages smoothly.

Handles and other hardware

Door handles take a lot of daily use and can wear loose, snap internally, or simply look tired. Replacing a handle is usually straightforward and inexpensive, though matching the finish and spindle length to the existing door sometimes needs a quick check before ordering.

What changes the price

A handful of factors shift door lock pricing beyond just the part being replaced.

• Brand and mechanism length — some manufacturers' parts cost more to source than others
• Security rating — anti-snap and higher security cylinders cost a little more than basic ones
• Urgency — an emergency callout after a break-in or lockout carries a different price to a scheduled repair
• Whether multiple items need replacing together, e.g. cylinder and handles at the same time

Indicative door lock pricing

These are typical fitted prices for London; a fixed price is always confirmed once we know the exact door and lock make.

Security upgrades worth considering at the same time

If you're already having a lock replaced, it's often a good moment to consider upgrading to a higher security cylinder rating, or checking the hinges are in good condition — a door with a strong lock but worn hinges is still a weak point. Our hinges and handles service covers this side of door maintenance.

Call Mark on 07535 916982 or request a callback.