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Lock Installation in Canterbury
Need lock installation in Canterbury? We dispatch 24/7, any day of the year and aim to reach you within 28 minutes. Fixed quote before work begins.
Other locksmith services in Canterbury need lock changes, repairs, upgrades or commercial help instead?
All services in Canterbury →Shared and multi-occupancy commercial properties typically require per-room cylinder replacement at each occupancy changeover to prevent residual key access. A restricted keyway system simplifies key management: cylinders can be rotated between rooms at changeover without cutting new keys for every lock, while the restricted profile prevents unauthorised key duplication by any previous occupant.
On arrival
Measurement checklist: what we record on arrival
Four measurements are taken before any hardware comes off the van on a Canterbury installation. A wrong-part revisit costs more than two minutes of careful measuring — we never skip this step.
| Measurement | Why it matters | Typical range |
|---|---|---|
| Stile width | Sets which per-room cylinder case will physically fit without weakening the door at the lock rail. HMO regulations require that no previous tenant retains a working key after the tenancy ends — either replace the cylinder or use a restricted keyway that allows re-keying without a full cylinder swap. | 44 mm minimum for a full BS3621 mortice; narrower stiles may require a slimline case or a euro-cylinder alternative |
| Frame recess depth | HMO and student-let access hierarchy: front door on a separate cylinder to individual rooms; consider a restricted keyway for front door if turnover is high and key duplication control is a requirement. | 13–20 mm on most residential timber; composite and UPVC frames can run shallower |
| Door thickness | Controls the cylinder length from face to face. A cylinder sitting proud of the outer face — even by 3 mm — creates a snap-attack leverage point that defeats anti-snap ratings. | 44 mm (standard timber), 54 mm (solid composite), 70 mm (hardwood or fire-rated) |
| Cut-out position | The distance from the door edge to the centre of the existing cut-out sets the backset. Extending an existing cut-out adds time and cost; fitting into the existing position is preferred wherever the hardware allows it. | 45 mm backset (most residential); 60–70 mm on commercial and period doors |
All four measurements are recorded on the job card and referenced in the installation certificate. If the measurements reveal a door that cannot accept the specified hardware without prep work, that is flagged and quoted before any tools come out.
Before quoting
Six door conditions that change the Canterbury quote
The main pricing variable on multi-occupancy properties is cylinder consistency: fitting all rooms on a matching restricted keyway takes more parts cost but fewer return visits over time. We quote both options — individual cylinders and a full restricted scheme — so the upfront cost can be weighed against the changeover saving. From £59 for a standard installation on a door in good condition.
- 01 Narrow stile
Victorian terrace stiles often show taper and wind from seasonal movementover many decades. A straight-edge check at the lock rail reveals whetherthe stile is square enough to take a full BS3621 case without the forendlifting at the edge on a warm day.
- 02 Composite vs timber construction
Composite and UPVC doors use a different cylinder system from timber — euro profile with a multipoint gearbox rather than a mortice. Per-room cylinders: standard euro barrel on uPVC internal doors; sash lock or nightlatch on timber internal doors. Measure both. Confirming construction type before ordering avoids a wrong-part visit.
- 03 Existing cut-out dimensions
On multi-occupancy properties the cut-out position across all room doors is checked before a single cylinder is ordered. Where cut-outs vary, each door is listed separately on the quote — a flat per-room rate is not appropriate when some doors need aperture work and others do not.
- 04 Nightlatch position
In HMO properties where a fire door closer is fitted to a room door, the nightlatch position must not interfere with the closer arm travel at the top of the door leaf. Arm clearance is measured in the fully open position, and the backplate is located below the swing zone so the closer and lock can both operate independently.
- 05 Frame condition
We map the access hierarchy the frame for squareness, settlement, and rebate wear before committing hardware to final position. A frame that is out of square or has a worn rebate needs addressing first — fitting a mortice into a moving frame produces a bolt that binds within months.
- 06 Letterbox clearance
Internal room doors in HMO properties do not typically have letter plates, but converted properties with original Victorian or Edwardian internal timber doors sometimes do. Where an original internal door retains a letter plate, the nightlatch backplate position must clear it — the plate sits in the stile face and can conflict with nightlatch fixings if the stile is narrow.
Specification
Hardware compatibility: will this door accept BS3621?
Three questions answer most hardware compatibility conversations on a Canterbury installation. We work through each on arrival and confirm the spec before any cutting or drilling starts.
- 01
Can this door accept BS3621?
A BS3621 5-lever mortice requires a minimum stile width (44 mm), a frame rebate to accept the forend, and sufficient door thickness at the lock rail. We check all three before specifying — a door that cannot take a BS3621 case without structural compromise will be quoted with a compliant alternative using a per-room cylinder or restricted keyway instead.
Front-door master-key schemes in HMOs must be documented under the tenancy agreement — confirm with the landlord before fitting.
- 02
Cylinder size: 35/35 vs bespoke
Standard residential doors run 35/35 or 35/45 euro cylinders; composite and commercial doors often need bespoke lengths. We assign cylinders per tenancy the cylinder run on site — face to face across the door leaf at the lock rail — and confirm the key rotation scheme specification before fitting. An oversized cylinder leaves the anti-snap collar exposed.
Anti-snap cylinders must be sized with the break-point inside the door face. A cylinder that is even 3 mm too long on the outside is vulnerable to a snap attack regardless of its anti-snap rating.
- 03
Nightlatch: rim vs mortice
Rim nightlatches surface-mount on the door face and require backplate clearance from the door edge and from any adjacent furniture. Mortice nightlatches fit into the door thickness and suit doors where the face is already occupied by a letterbox or knocker. The choice depends on the stile geometry confirmed at measurement, not a preference.
On insurance-graded installs both the primary lock and the nightlatch are noted on the compliance certificate. If the policy specifically names a rim nightlatch at a given standard, we confirm that against the door construction before the certificate is issued.
Completion
Handover and testing
The installation is not complete until every lock has passed a full function test on a closed door. On Canterbury jobs we sign off three checks before handing back keys.
- Cycle test
Restricted-keyway cylinders used in HMO properties are cycle-tested with the registered key blanks supplied at the time of installation, not with duplicates. Using the original registered blanks for the handover test confirms the keyway profile has not been damaged during fitting, which can occur if the cylinder was driven home with a key in place.
- Key issue
Keys are counted against the job card in front of the keyholder. Each key is labelled with the door reference it was cut for. No key leaves site unaccounted — if the agreed number is not present at handover, the job card flags the discrepancy before the engineer leaves.
- Written summary and certificate
Where a master-keyed suite is installed across an HMO, the handover summary records the suite reference, the cylinder manufacturer, and the keyway identifier alongside each room entry on the door schedule. Future cylinder additions to the suite require this reference to ensure the new cylinders are ordered within the same key system.
Questions
Lock installation FAQ: Canterbury
For HMO and student properties the installation question is usually about per-room cylinder economics: rekey versus replace on each tenancy change, and whether a restricted keyway is worth the additional cost per door.
- Do I need to measure my door before calling?
- No — we measure on site. For Victorian terrace doors, knowing the door typeand approximate age helps: a solid timber door from before 1930 is measureddifferently from a post-war replacement panel. The door material tells uswhat gauge to use; the age narrows down whether standard or slimlinehardware is likely. A full survey happens on arrival before any hardware isordered.
- Will the new lock look different from the original?
- On like-for-like replacements — same case position, same forend size — the external appearance changes only in terms of the new cylinder rose or escutcheon. On period doors where the original furniture is being retained, the escutcheon fit is checked for compatibility before the hardware is sourced. Where the new spec requires a different door face profile (e.g. switching from a mortice keyhole to a euro cylinder profile), we flag that on the booking call before the job date.
- How long does a Canterbury lock installation take?
- A standard like-for-like cylinder replacement on a composite or UPVC door takes around 30–45 minutes including the full test cycle. A new BS3621 mortice installation on a timber door — where the existing cut-out is the right size — takes 60–90 minutes. If the door needs prep before the hardware fits (rebate adjustment, aperture extension, hinge correction) we agree the additional time and cost before starting. We do not proceed past the assessment stage without a confirmed price.
- What if the door needs repair work before the lock can be fitted?
- Where an HMO room door has a long-standing impact dent at the cylinder height — common on high-traffic student properties — the dent is assessed for whether it has deformed the door edge enough to prevent the cylinder from seating flush. Minor deformation up to 3 mm is corrected with a block plane before boring; greater deformation is quoted as a door-leaf replacement item.
Lock Installation in Canterbury — FAQ
Common questions about lock installation in Canterbury.
Can you install a lock on a brand-new door?
For HMO and student properties the installation question is usually about per-room cylinder economics: rekey versus replace on each tenancy change, and whether a restricted keyway is worth the additional cost per door. Yes — this is one of our most common installation jobs in Canterbury. 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.
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.
Do you install locks on gates and outbuildings?
Yes — weather-rated padlocks, BS-grade hasps, garden gate locks, and shed/garage door hardware are all regular installation work across Canterbury. We match the lock to the exposure (weatherproofing matters outdoors) and fit on the same visit.
Will a new lock invalidate my door warranty?
Not normally. Most door manufacturers specify that lock installations must be done by a competent locksmith — we are, and we fit to manufacturer-approved positions and dimensions. If in doubt, mention the door brand when you call and we'll confirm compatibility before attending.
Also nearby
Areas near Canterbury
we also cover
Our engineers don't just cover Canterbury — we serve the surrounding towns and neighbourhoods too. If you're just outside Canterbury, we can still reach you fast.
- Whitstable 7.2 mi
- Herne Bay 8.5 mi
- Faversham 9.8 mi
- Folkestone 15.4 mi
- Maidstone 17.8 mi
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