Mortice Locks & Yale Nightlatches
Croydon's front doors tell a story of mixed housing stock — Victorian terraces along streets like Morland Road, converted flats in the town centre, and newer builds out towards Addiscombe and Shirley — and that variety means the locks on those doors vary enormously too. Whether your home has a traditional timber door with a 5-lever mortice deadlock and a Yale-type nightlatch, or a modern uPVC door with a multipoint lock and euro cylinder, Addiscombe Locksmith provides expert fitting, replacement, and repair across the whole Croydon area, day or night.
Open 24 hours, 7 days a week · Fully insured
Our trained, insured technicians operate as a fully mobile service — there is no shop to visit, because we come to you. If you have a lock that has failed, a door that will not secure properly, or you simply need to upgrade your existing hardware to satisfy your insurer, call 020 4542 3118 and we will dispatch a locksmith straight away. We are usually with you in about 30 minutes, and we work evenings, weekends, and bank holidays with no reduction in service quality.
What we do
Available 24/7
Day, night, weekends and bank holidays — a real local locksmith answers and sends a fully-stocked van.
We come straight away
Based in Croydon, we send a locksmith straight away — we're usually with you in about 30 minutes.
Fully insured
Vetted locksmiths, a clear price on the phone, and no surprise add-ons when we arrive.
Damage-free entry
We pick and bypass locks the right way, so most lockouts are solved without drilling anything.
Why Mortice Locks and Yale Nightlatches Still Matter on Croydon Doors
The pairing of a 5-lever mortice deadlock and a Yale-type nightlatch has been the standard security arrangement on British timber front doors for decades, and it remains the combination that most home insurers in Croydon expect to see. The nightlatch gives you everyday convenience — the door locks automatically when it closes — while the mortice deadlock, set into the body of the door itself, provides the structural resistance that a surface-mounted latch simply cannot match. Insurers frequently specify that the mortice lock must meet BS3621, the British Standard for thief-resistant locks, which covers bolt throw length, anti-pick pins, anti-drill plates, and reinforced boxes. Fitting a lock that carries the BS3621 kite mark is often a condition of your policy rather than optional guidance.
The two locks work as a system. A Yale nightlatch on its own can be lifted with a credit card if the keep is worn, and without the mortice deadlock thrown, a door can be forced far more easily. Equally, a mortice lock that has not been serviced in many years can develop worn levers, stiff bolts, or a broken follower — problems that are not always obvious until the lock fails at the worst possible moment. If your Croydon property still has the original mortice lock fitted when the house was built, there is a good chance it predates modern BS3621 requirements. Our experienced locksmiths assess the existing hardware honestly and recommend only what your specific door and frame genuinely need.
Fitting and Replacing 5-Lever Mortice Deadlocks — What the Job Actually Involves
Fitting a BS3621-compliant 5-lever mortice deadlock is skilled work. The mortice — the rectangular slot cut into the door edge — must be precisely sized and positioned for the new lock body. If you are replacing a like-for-like lock, the existing mortice is often the right size, but older doors sometimes used non-standard case dimensions, and in those cases the mortice may need to be carefully extended. The keep (the reinforced metal plate and box recessed into the door frame that the bolt shoots into) must align exactly, because a misaligned keep puts stress on the bolt and reduces the lock's resistance to attack. Our technicians carry a range of BS3621-stamped 5-lever mortice deadlocks in the van and size up the door and frame before recommending a specific lock body.
On Croydon's older terraced streets — particularly properties with original or early-replacement timber doors — we sometimes find that decades of paint have swollen the door edge, that the door has dropped on its hinges, or that the frame has shifted, all of which affect how the mortice lock and keep interact. We address the underlying fit issue before fitting the new lock rather than simply bolting a new lock into a door that will cause it to wear prematurely. Where the door frame itself is damaged around the keep, we can fit a London bar or a reinforced keep plate to restore structural integrity. The aim throughout is a lock that works smoothly, resists attack, and meets your insurer's requirements.
Yale Nightlatches — Lock Change Croydon, Door Lock Replacement Croydon, and Emergency Lockout Work
Yale-type nightlatches are among the most common reasons we receive calls across Croydon — both for planned lock changes and for emergency lockouts. A nightlatch cylinder can be damaged by a snapped key, worn through years of use, or deliberately interfered with. Because the cylinder sits close to the outer face of the door, it is also more exposed to weather than a mortice lock, and rim cylinders on older nightlatches can corrode internally. When a nightlatch cylinder fails, we replace the cylinder and, where the rim case itself is worn or damaged, the entire unit. We carry standard-size and security-rated rim cylinders to suit the most common Yale-pattern cases found across Croydon's housing stock.
For tenants in flats — particularly those in blocks along the London Road corridor or in converted properties around South Croydon and Purley — a nightlatch is often the primary lock on the flat's own front door, with the communal entrance handled separately. If you are a tenant and your nightlatch has failed, we will ask for proof of residence before carrying out any work: this is standard practice and protects both you and the property. Landlords and letting agents in Croydon can also call us to arrange lock changes between tenancies, and we work around their schedules. If you are locked out right now, call 020 4542 3118 — we answer 24/7 and we will send a locksmith to you straight away.
24 Hour Locksmith Croydon — Pricing, Credentials, and What to Expect When We Arrive
Every call to our 020 4542 3118 number is answered by a real person at any hour. When you describe your situation — whether it is an emergency lockout, a failed lock, or a planned upgrade — we ask the relevant questions: what type of door, what type of lock, your postcode district, and whether parts are needed. The final quote depends on factors including the type of lock required, the condition of the door and frame, the time of day (evenings, weekends, and bank holidays affect the call-out element), travel distance, and what parts are needed from the van stock. We confirm an exact up-front price before any work begins, so there are no surprises on completion.
Our technicians are trained and insured, and they carry identification. We work damage-free wherever possible — picking or manipulating a lock rather than drilling it whenever the lock's condition and type allow — because preserving the door and frame matters, particularly on period properties or rented accommodation where you are responsible for the fabric of the building. For planned jobs such as a BS3621 upgrade or a full lock change between tenancies, we can usually offer a same-day or next-day visit across Croydon. We cover CR0, CR2, CR3, CR4, CR5, CR6, CR7, CR8, and CR9 postcode districts, including Addiscombe, Thornton Heath, Norbury, Coulsdon, Purley, and Selsdon.
Frequently asked questions
Answers to what our customers ask most. Still unsure? Just call.
My insurer says I need a BS3621 lock — does my current 5-lever mortice deadlock qualify?+
Not all 5-lever mortice deadlocks meet BS3621. The standard requires specific features including a bolt throw of at least 20mm, anti-pick and anti-drill resistance, and a reinforced keep box. A genuine BS3621 lock carries the kite mark stamped on the faceplate or body. If you are unsure, call us on 020 4542 3118 and describe what you have — or we can visit, inspect the existing lock, and confirm on the spot whether it meets the standard or needs replacing.
What factors affect how much a lock change in Croydon will cost?+
The final price depends on several things: the type of lock required (a standard nightlatch cylinder replacement costs differently to a full BS3621 mortice deadlock fitting with a reinforced keep), the condition of your door and frame, whether the door has dropped or the mortice needs extending, the time of day you call (evening, weekend, and bank holiday call-outs include a time-sensitive element), and your location within the Croydon area. We always confirm an exact price on the phone before we come out, so you know the full figure before anyone travels to you.
I am locked out of my Croydon flat — what should I do before calling a locksmith?+
First, check whether you have a spare key with a neighbour, friend, or family member, or whether your letting agent or managing agent holds one — many Croydon landlords leave a spare with the agent for exactly this situation. Check other entry points you have legitimate access to, such as a back door. If none of those options work, call 020 4542 3118 and we will send an experienced locksmith straight away. We will ask you to confirm your name and address and may ask for proof of residence when we arrive — this is standard practice to protect the property and is nothing to be concerned about if you are the tenant or owner.
Can you replace a Yale nightlatch on a uPVC door, or is that a different type of job?+
A traditional Yale-pattern nightlatch is designed for timber doors and is not fitted to uPVC doors in the same way. uPVC and composite doors use a multipoint locking mechanism operated by a handle, with a euro cylinder as the key-operated component. If your uPVC door is not locking correctly or the cylinder has been damaged, that is a door lock replacement job involving the euro cylinder and sometimes the multipoint mechanism itself. Call us and describe your door — we will tell you exactly what is involved before we visit.
How quickly can you reach me for an emergency lockout in Croydon?+
We dispatch a locksmith as soon as you call, and we are usually with you in about 30 minutes. Actual travel time depends on where our nearest available technician is at that moment and traffic conditions in the Croydon area — we cannot guarantee an exact time, but we work 24 hours a day, seven days a week including bank holidays, so there is always someone available to respond.
Do you work damage-free, or will fitting a new mortice lock mean damage to my door?+
Fitting a new mortice lock does involve cutting or extending the mortice slot in the door edge, but this is controlled, precise work — not forced entry. For lockout situations, our technicians will always attempt to open the door by non-destructive means first, such as picking or manipulating the lock, before considering drilling. If drilling becomes necessary, we replace the lock cylinder as part of the job so the door is fully secure when we leave. We aim to leave the door and frame in better condition than we found it, and we will always explain the method before we start.
Locked out or need a lock fixed? We are on the way.
We answer 24/7 — talk to a real local locksmith now.
020 4542 3118