24/7 · SE13 · DBS checked engineers
Lewisham Lock Installation
Our Lewisham engineers handle lock installation across Lewisham and the surrounding Greater London area. Available 24/7, any day of the year; 15-minute average arrival. No surprises on price.
Other locksmith services in Lewisham need lock changes, repairs, upgrades or commercial help instead?
All services in Lewisham →The door condition assessment on a Victorian terrace property covers four points before any hardware is specified: stile integrity (no rot or splits at the lock rail), hinge security (screws tight, no excessive drop), rebate condition (paint build-up within tolerance), and frame plumb. Problems at any of these points are identified before the customer is committed to a hardware cost, not after the work is under way.
On the day
Fitting day in Lewisham — the five-step sequence
New locks go in against a defined sequence, not ad-hoc. Here's the order each of our engineers works through on a typical Lewisham installation — the same on a terraced front door as on a new-build UPVC back door.
- 01
Confirm parts and measurements
Before any tools come out we walk through the hardware that's been ordered for your Lewisham property — cylinder sizes, gearbox type where relevant, strike plate dimensions, and any fire or insurance ratings. If something's a size off, we reschedule rather than force the fit.
- 02
Prep door and frame
Existing furniture is removed, the door checked for square and for any swelling or drop on the hinges. On older SE13 stock the frame often needs a chisel adjustment at the keep; on new-build doors it's usually a clean lift and drop. Anything structural that's out of scope is flagged before we go further.
- 03
Fit the hardware
Cylinder, gearbox, multipoint strip, or mortice case goes in against the manufacturer's template. Fixings match the frame material — steel screws into softwood, self-tappers into aluminium, no-slip fixings into composite. Nothing is over-torqued; we measure the transom rail clearance above the nightlatch before any fixing is committed to final torque.
- 04
Align and test
Every operation is tested with the door both open and closed — key in, key out, handle lifted, deadlock thrown, thumb-turn from inside. On a multipoint we test each hook and shoot-bolt independently before signing off. Anything that binds gets adjusted there and then, not "later".
- 05
Handover and keys
Keys are counted against the job card and handed over with a one-page written summary: what was fitted, the transom rail clearance spec noted, serial numbers where relevant, and a seven-day follow-up window. On insurance-graded installs the compliance paperwork lands by email the same day.
What we measure
Four measurements that decide the fit in Lewisham
Victorian period door height geometry: mortice centre height is measured from finished floor level and recorded. Top bolt position is confirmed against the available solid stile zone above the nightlatch — minimum 80 mm of solid timber required for the top bolt fixing screws.
-
Door thickness
44 / 54 / 70 mm
Determines whether the standard cylinder length fits flush or needs a long-body variant.
-
Backset
45 / 60 / 70 mm
Distance from the edge of the door to the centre of the cylinder. Common on UK doors but not universal.
-
Euro cylinder length
30/30 → 45/55
Measured separately from each side of the door. Must sit flush — too proud and the cylinder is vulnerable to snapping.
-
Frame material
Timber · Composite · Aluminium
Lewisham stock varies widely. Frame material dictates fixings, strike plate type, and the correct spec for the transom rail clearance.
- A transom rail fitted above the main door panel reduces the available upper stile zone — confirm there is at least 80 mm of solid stile timber above the nightlatch before fitting a supplementary top bolt.
- Mortice centre height from floor level is recorded on the job sheet for all installations — this measurement is used to locate the keep on the frame without re-hanging the door.
- Upper stile zone must be in solid timber, not in the glazing bar area or a thin moulding — check the inner door profile before fitting a top bolt in the upper zone.
Pricing — what shifts it
What affects a Lewisham lock installation price
Period terrace pricing depends primarily on the existing mortice aperture: a clean cut-out at the right size is straightforward; extending a narrow stile or adjusting the rebate for a wider case adds prep time. We measure before the quote is fixed — not after work begins. From £59.
- 01
New-fit vs like-for-like replacement
Fitting into an existing cut-out is cheaper than routing a new one. Period doors in Lewisham often need a fresh cut; UPVC is almost always like-for-like.
- 02
Hardware tier
Standard cylinder sits at the base price; TS007 3-star anti-snap, BS3621 mortice, and restricted keyways each add to the parts cost.
- 03
Door condition
A square door on tight hinges fits fast. Drop at the hinge side, swelling, or a warped strike plate adds time — we flag this during the measurement call, not at the end.
- 04
Number of doors on the same visit
Fitting front, back, and garage side-door in one appointment is meaningfully cheaper than three separate visits across Lewisham.
Lock Installation in Lewisham — FAQ
Common questions about lock installation in Lewisham.
Can you install a lock on a brand-new door?
The most common FAQ on a period terrace front door is whether it can meet the insurer's BS3621 requirement. The answer depends on the stile width: a narrow Victorian stile — common on smaller terrace houses — may not accept a full BS3621 5-lever case without reducing the door strength at the lock rail. Where that is the case, a narrower BS3621-certified case or an alternative compliant spec is the right answer, not forcing an oversized mortice into a door that cannot support it. Yes — this is one of our most common installation jobs in Lewisham. Carpenters and joiners often hang the door and leave lock fitting to specialists. We measure the rebate, chisel for a BS3621 mortice case, fit the strike plate, and test through a full key cycle. Finished work looks factory-fit.
Do I need BS3621 on a new installation?
For external doors on Lewisham homes with standard insurance — yes, almost certainly. BS3621 is the minimum most UK home insurers specify on final-exit wooden doors. We fit BS3621 as standard and issue written paperwork confirming the standard for your insurance file.
Can you keyed-alike multiple new locks?
Yes — if you want one key to open your front and rear doors, we supply keyed-alike cylinders on the most common profiles. Arrange at the survey stage so we bring matching parts. This works cleanly on UPVC euro cylinders and on certain mortice profiles.
We've just moved into a new-build in Lewisham — do the locks already meet insurance standards?
Not always. Many Lewisham new-builds come with entry-level euro cylinders on UPVC or composite doors that lack the TS007 3-star anti-snap rating, and sometimes a mortice case that predates BS3621 on the side door. We survey the whole property, identify any hardware gaps, and upgrade to compliant standards on the same visit — with a compliance pack for your insurer.
Also nearby
Areas near Lewisham
we also cover
Our engineers don't just cover Lewisham — we serve the surrounding towns and neighbourhoods too. If you're just outside Lewisham, we can still reach you fast.
Ready when you are
Need lock installation in Lewisham now?
24/7 dispatch across Lewisham and the SE13 area. Fixed quote before work starts. Free call-out with every completed job.