South London based · South East & Central London · Same-day fitting
New locks supplied and fitted in one visit. BS3621 mortice locks, high-security cylinders, and smart locks. Insurance-approved, no call-out fee.
Stay calm · we're on the way
A few things that genuinely help — and a few that make it worse. Read these while we head to you.
Try a back door, ground-floor window, neighbour with a spare key, or your landlord/agent. Saves you a call-out fee if you find a way in.
Kicking, drilling, or wedging cards turns a £85 lockout into a £300+ replacement. Step back and let us pick it open cleanly.
Driving licence, council tax bill or tenancy agreement showing the address. We always check before opening — for everyone's safety.
Rogue traders quote £49 then bill £450 once they're done. We give you a fixed price over the phone before we arrive — same rate day or night.
Wait somewhere well-lit (a neighbour, local cafe, your car). Drop us a pin via WhatsApp so we know exactly where you are.
Call 101 for non-emergency police first — you'll need a crime reference number for insurance. Then call us. We can board up tonight and replace glass tomorrow.
What We Fit
We carry stock of the most common lock types and can advise on the best option for your door and security needs.
The insurance-standard lock for front doors. A 5-lever mortice deadlock that meets British Standards — required by most home insurance policies.
Anti-snap, anti-drill, anti-pick cylinders for uPVC and composite doors. A significant upgrade over standard cylinders — vital after a break-in attempt.
Replacement multi-point mechanisms for uPVC and composite doors — locking at multiple points around the door frame for maximum security.
Keypad, app-controlled, and key-fob smart locks for homes and businesses. Great for Airbnb, rental properties, and offices needing flexible access.
Standard or high-security Yale-style nightlatches for front doors. We supply and fit quality brands including Yale, Era, and Chubb.
Key systems for offices, HMOs, and commercial properties — allowing different staff to access different areas from a single master key.
When to Act
Why BLD
Coverage
South London based — we carry out lock changes across all of London, including South East, Central, East London and beyond.
FAQ
A cylinder change typically takes 20–30 minutes per door. For a standard flat with one front door and one back door you'd be looking at under an hour in total. We carry stock of BS3621 deadlocks and high-security cylinders and can usually do it the same day. Always a sensible first move in a new home.
As a tenant you have the right to feel secure in your home. While you should inform your landlord, they cannot legally prevent you from changing the locks for security reasons — you just need to provide them with a spare key. We can advise on what's reasonable and fit a lock that works for both you and your landlord's obligations.
BS3621 is the British Standard for security mortice deadlocks — it's the minimum most home insurance policies require on your front door. We always fit insurance-compliant locks and can advise exactly what your policy needs. If you're not sure what you currently have, we'll check when we visit.
A cylinder change or rekey is the quickest, most cost-effective solution. We can usually be with you same-day. For offices with multiple entry points or high footfall, we can also advise on a master key system so only current keyholders have access. Call to discuss — we'll sort it quickly.
We give you a fixed price upfront before we start anything — and we charge the same rates day or night. No call-out fee, no hidden charges. Prices vary by lock type (cylinder, mortice, high-security), but call or WhatsApp and we'll quote you in 2 minutes.
Transparent Pricing
No call-out fee. We confirm a fixed price over the phone before we start. These are typical guides, not maximums.
| Service | From | Typical time |
|---|---|---|
| Cylinder change (standard euro / UK) | Call for a quote | 20-30 mins |
| Anti-snap cylinder upgrade (TS007 3-star) | Call for a quote | 20-30 mins |
| BS3621 mortice deadlock fitting | Call for a quote | 45-60 mins |
| Multi-point gearbox replacement (uPVC) | Call for a quote | 60-90 mins |
| Smart lock installation (Yale / Ultion) | Call for a quote | 60-90 mins |
| End-of-tenancy whole-property re-key | Call for a quote | 60-120 mins |
Prices include parts & labour for the most common variants. Unusual locks (high-security commercial cylinders, custom multi-point gearboxes, large shopfront glass) may sit higher — we'll always confirm a fixed price after a quick phone description before we set off.
Same-day fitting · BS3621 insurance-approved · No call-out fee · Fixed price