What Is a Yale Lock?
When most people say "Yale lock," they mean the spring-loaded latch on their front door — the one that clicks shut behind you and opens with a small flat key. Technically, this is a rim-mounted nightlatch, and Yale is the brand that made it ubiquitous across British homes. The lock sits on the inside face of your door with a cylinder poking through to the outside. Turn the key, the latch retracts, the door opens. Let go, the spring snaps it shut again.
Yale makes several nightlatch models and each one has meaningfully different security. The Yale 77 is the basic budget model — functional, but the angled latch can be pushed back with a credit card (locksmiths call this "carding"). The Yale 85 and Yale 89 are deadlocking nightlatches — once the door is closed, the latch bolt locks in place and cannot be carded. The Yale PBS1 is the only Yale nightlatch rated to BS3621, which is the standard most UK home insurers require. If your insurer asks for a BS3621 lock and you only have a standard Yale 77, you may not be covered in a break-in claim.
We fit every Yale nightlatch model across South London — from basic replacements to BS3621 upgrades. We also supply the newer Yale Conexis L2 smart lock for homeowners who want keyless entry. Browse our full lock types guide for comparisons, read our locksmith advice for security tips, or check our lock replacement costs page for pricing across all lock types. We cover all areas across South London and respond within 30 minutes for emergencies. About us · Contact us
Yale Nightlatch Key Features
Security Rating
Standard (77): basic. Deadlocking (85/89): good. PBS1: BS3621 insurance-approved. Choose based on your insurance requirements.
Key Type
Flat Yale key operates a rim cylinder. Two keys supplied with new locks. Additional keys cut to order. PBS1 uses a restricted key profile.
Best Used For
Front doors (timber and composite). Usually paired with a mortice deadlock below for full security. Not suitable as the only lock on a main entrance.
Price Range
Night latch replacement from £250 fitted. Includes genuine Yale hardware, rim cylinder, two keys, and fitting. BS3621 PBS1 models cost more.
Is a Yale Lock Right for Your Door?
Yale is right if:
- + You have a timber or composite front door
- + You want a self-closing latch for daily convenience
- + You need a quick, same-day lock replacement
- + You are pairing it with a mortice deadlock below
- + You want the PBS1 for standalone BS3621 compliance
Consider alternatives if:
- - You have a uPVC or multipoint door (need a euro cylinder instead)
- - You want keyless entry (consider a keypad lock or smart lock)
- - Your insurer demands BS3621 and you do not want two locks
- - You need high-security for a commercial property
Our Yale Lock Services in South London
Supply & Fit
New genuine Yale nightlatch supplied and fitted to your door. Models 77, 85, 89, PBS1 in stock. Same-day fitting available.
from £250Repair
Yale lock stiff, jammed, or not latching? We diagnose and fix the mechanism, replace worn springs, and realign the keep plate.
from £120Replacement
Old Yale worn out or compromised? We remove the old unit and fit a new one in the same position. Upgrade to deadlocking or BS3621 while we are there.
from £250Emergency Call-Out
Locked out or Yale lock snapped? 24/7 emergency service across South London. Non-destructive entry and same-visit replacement.
from £120How It Works
Call Us
Phone or WhatsApp a photo of your current Yale lock. We identify the model, confirm stock, and quote a fixed price.
We Arrive
We come to you with the Yale lock in the van. Old lock removed, new one fitted, aligned to the keep plate, and tested from both sides.
Lock Fitted, Job Done
Keys handed over, lock tested, cleanup done. We leave only when you are happy the door works perfectly from both sides.
Why Choose Locksmith South London?
Every engineer verified.
You pay for the lock and fitting only.
For emergencies across South London.
Real reviews from real customers.
77, 85, 89, PBS1, Conexis in the van.
Quoted before we start.
Written guarantee on every job.
We tell you if your Yale meets BS3621.
Yale Lock Fitting Costs South London
Fixed prices. Genuine Yale products. No hidden fees.
Emergency Lockout
Non-destructive entry if you are locked out. 24/7 availability.
Cylinder Change
Replace just the rim cylinder (the part the key goes into).
Full Nightlatch Replacement
Complete Yale nightlatch removed and replaced with new unit.
BS3621 Upgrade
Upgrade to Yale PBS1 or add a mortice deadlock for insurance.
for fixed quote
What Our Customers Say
"My old Yale lock had been stiff for months and finally jammed completely on a Friday evening. He arrived within 25 minutes, opened the door without damage, and fitted a new Yale 89 deadlocking nightlatch. Explained the difference between the models and why my old one was a security risk. Really professional."
Dulwich, SE21
"Our insurer flagged that our front door Yale was not BS3621. He fitted a new Yale plus a 5-lever mortice deadlock below it, both insurance-grade. He even wrote down the BS numbers for us to send to the insurance company. Brilliant service."
Carshalton, SM5
"Quick Yale lock change on a Victorian front door in Tooting. He matched the new lock to the existing door prep perfectly — no extra drilling needed. Was done in under half an hour. Will use again for the back door."
Tooting, SW17
Frequently Asked Questions
What is a Yale lock?
Are Yale locks insurance approved?
How much does it cost to replace a Yale lock?
Can a Yale lock be opened with a credit card?
What is the difference between a Yale lock and a deadlock?
Areas We Cover in South London
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Related locks & problems
Locations we cover
Need a Yale Lock Fitted in South London?
Genuine Yale products. Same-day fitting. Fixed price from £250. Call now or WhatsApp a photo of your current lock.
24/7 emergency locksmith serving South London since 2015 — trusted by homeowners, landlords and businesses across Sutton, Mitcham, Wallington, Cheam, Purley and surrounding areas.