A guide to lock repair.

Lock repair and maintenance in the UK typically costs £40–£180 for routine servicing and minor repairs — a fraction of the cost of replacement. A bit of regular care extends lock life from 5-7 years (typical for neglected locks) to 15-25 years for premium lock systems.

Most lock failures aren't the lock — they're worn keys, dirty mechanisms, or hinges that have dropped putting strain on the lock. Diagnose properly before replacing.

Common lock problems and what they cost

DIY lock maintenance you can do yourself

• Lubrication — use graphite powder (specifically for locks, not WD-40 which attracts grit). Pop into the keyway annually.
• Clean the keyway — compressed air to blow out dust and debris. Particularly useful for outdoor locks exposed to weather.
• Test before replacing keys — if a key feels stiff, lubricate first. The key is rarely the issue; it's usually the lock.
• Check hinges — door dropping puts side-load on the lock and accelerates wear. Tighten hinge screws annually.
• Watch for water ingress — outdoor locks rust internally. Some weatherproof covers help, particularly on padlocks and gate locks.

When to repair vs replace

Repair when:

• Lock is mid-spec or premium (Banham, ASSA, Mul-T-Lock, modern UPVC multi-points).
• Single fault is identified (worn lever, dirty mechanism, alignment issue).
• Lock is under 10 years old.
• Replacement keys are not lost or compromised.

Replace when:

• Lock body has structural failure (cracked, deformed).
• All keys are lost or in unknown hands.
• Lock is below current insurance standard.
• Multiple repairs in short succession (lock has reached end-of-life).
• Significant security upgrade is appropriate (post break-in, after long-term tenancy).

Common UPVC multi-point lock issues

Multi-point locks (the locking mechanism along the edge of UPVC and composite doors) develop classic symptoms with age:

• Door doesn't lock when handle lifted — usually the gearbox failing.
• Handle very stiff — gearbox jamming, sometimes fixable with relubrication.
• Hooks don't engage with keeps — frame has dropped or warped; needs adjustment.
• Cylinder hard to turn — cylinder wear; replace.
• Door drops when open — hinge failure; tighten or adjust.

UPVC multi-point gearbox replacement typically £140-£300 fitted. A locksmith with experience in your specific brand (Yale, ERA, Avocet, Lockmaster) is essential.

Things people often miss

• WD-40 isn't lubricant for locks — it's a water displacer. Initial relief, then gunks up over months as it dries. Use graphite powder or specific lock lubricant.
• Worn keys wear the lock — soft brass keys shape themselves to a worn lock pattern. Cutting fresh keys from the worn ones perpetuates the issue. Cut from the original spec or have the lock decoded.
• Door alignment vs lock condition — a sticking lock may be a door problem (settling, swelling, hinges dropped). A locksmith will diagnose; carpentry fixes are sometimes the right answer.
• Multi-point lock symptoms ≠ cylinder problem — UPVC owners often replace the cylinder when the actual problem is in the multi-point mechanism. Diagnose properly.
• Annual service for valuable locks — for high-security home locks (Banham, premium safes), annual service prevents expensive failures and keeps insurance compliance.
• Padlock care — outdoor padlocks need annual lubrication and weather covers. £5-£15 padlocks are disposable; £30+ padlocks (Squire, ABUS) deserve maintenance.

Frequently asked questions

Want a local pro to handle this? A locksmith specialising in your door type (timber, UPVC, composite) handles repair and maintenance more cost-effectively than replacement. The MLA directory finds vetted local specialists.