24/7 · PH1 · DBS checked engineers
Lock Installation in Perth
Lock Installation throughout Perth, around the clock, seven days a week — average response 30 minutes. Free call-out with every job — fixed price agreed before any work starts.
Other locksmith services in Perth need lock changes, repairs, upgrades or commercial help instead?
All services in Perth →Fitting locks on Victorian and Edwardian timber doors means working within the tolerances the original joiner set — not the tolerances modern hardware assumes. Mortice cut-out dimensions, rebate depth, and door thickness all need to be measured before a BS3621 mortice is ordered. We do that assessment on arrival and only start drilling if the existing aperture genuinely needs adjustment.
On the day
Fitting day in Perth — 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 Perth 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 Perth 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 PH1 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 hinge gap top and bottom 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 hinge gap measurement 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 Perth
Victorian terrace door geometry check: measure hinge gap at top hinge and bottom hinge separately. A differential of more than 3 mm indicates a drop or rack that must be corrected before the mortice and keep positions are finalised.
-
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
Perth stock varies widely. Frame material dictates fixings, strike plate type, and the correct spec for the hinge gap measurement.
- A door that is out of plumb by more than 3 mm will bind at the keep on one direction of swell — address plumb before fitting rather than adjusting the keep to compensate.
- Sill clearance on a Victorian terrace door sets the lower limit of how much the door can drop before it binds on the sill — measure before shimming hinges.
- Top-rail fit confirms whether the door leaf is racking — a racked door will never seat squarely against the mortice keep regardless of keep adjustment.
Pricing — what shifts it
What affects a Perth lock installation price
On Victorian and Edwardian properties the price depends on how much prep the door needs: a clean existing aperture costs less than extending a cut-out or squaring a warped rebate. BS3621 hardware itself is fixed; the labour variable is the door condition. Confirmed on arrival. 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 Perth 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 Perth.
Lock Installation in Perth — FAQ
Common questions about lock installation in Perth.
Can you install a lock on a brand-new door?
On Victorian and Edwardian doors the critical measurement is the existing mortice cut-out — it sets the ceiling on which 5-lever models will drop in without additional prep, and therefore what the job actually costs. Yes — this is one of our most common installation jobs in Perth. 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 Perth 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 Perth — do the locks already meet insurance standards?
Not always. Many Perth 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 Perth
we also cover
Our engineers don't just cover Perth — we serve the surrounding towns and neighbourhoods too. If you're just outside Perth, we can still reach you fast.
- Dundee 22.1 mi
- Kinross 13.4 mi
- Crieff 16.8 mi
- Blairgowrie 17.5 mi
Ready when you are
Need lock installation in Perth now?
24/7 dispatch across Perth and the PH1 area. Fixed quote before work starts. Free call-out with every completed job.