24/7 · SE1 · DBS checked engineers
Lock Installation Service in Southwark
Lock Installation across Southwark and surrounding areas, 24/7, any day of the year — average response 15 minutes. Free call-out with every job — fixed price agreed before any work starts.
Other locksmith services in Southwark need lock changes, repairs, upgrades or commercial help instead?
All services in Southwark →Door thickness at the lock rail on a Victorian terrace door can vary from the nominal measurement if the stile has been planed, filled, or patched at any point in its history. We measure thickness at the rail itself — not at the door edge above or below — because a reduced thickness changes the minimum cylinder body depth and whether a full-profile BS3621 case will seat without the fixing screws pulling through.
On the day
Fitting day in Southwark — 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 Southwark 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 Southwark 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 SE1 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 confirm the bolt throw distance 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 mortice bolt throw 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 Southwark
Period timber front doors: BS3621 5-lever case requires 25 mm minimum bolt throw; verify keep recess depth accommodates this fully. Backset measured from door edge to keyhole centre — typically 45–57 mm on Victorian stock.
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Door thickness
44 / 54 / 70 mm
Determines whether the standard cylinder length fits flush or needs a long-body variant.
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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.
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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
Southwark stock varies widely. Frame material dictates fixings, strike plate type, and the correct spec for the mortice bolt throw.
- BS3621 requires a minimum 25 mm bolt throw; confirm the keep depth accommodates the full throw without the bolt head contacting the back of the box.
- Five-lever stack engagement quality degrades if the case is slightly off-centre in the mortice pocket — check centre alignment after seating the case.
- Keyhole position relative to the escutcheon must allow the key to enter without deflection at the collar — check with the door closed under normal pressure.
Pricing — what shifts it
What affects a Southwark 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 Southwark 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 Southwark.
Lock Installation in Southwark — FAQ
Common questions about lock installation in Southwark.
Can you install a lock on a brand-new door?
Period timber doors have their own sizing constraints: rebate depth and stile width are the primary fitting variables, and the answer to most installation questions starts there rather than with the lock model. Yes — this is one of our most common installation jobs in Southwark. 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 Southwark 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 Southwark — do the locks already meet insurance standards?
Not always. Many Southwark 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 Southwark
we also cover
Our engineers don't just cover Southwark — we serve the surrounding towns and neighbourhoods too. If you're just outside Southwark, we can still reach you fast.
Ready when you are
Need lock installation in Southwark now?
24/7 dispatch across Southwark and the SE1 area. Fixed quote before work starts. Free call-out with every completed job.