Forest Gate Locksmith Service Team
Local locksmith team
7 Oct 2026 12 min read
If you look at a typical front door in Forest Gate — say, along Woodgrange Road or one of the Victorian terraces off Romford Road — you will almost certainly see two locks, not one. There is a small keyhole near the door handle, and a larger one higher or lower down the door. Most homeowners use them both every day without giving them much thought. But understanding what each lock is, how it works, and why you need both is genuinely useful knowledge — especially if you are locked out, thinking about upgrading your security, or your insurer is asking awkward questions about your front door.
The two locks are almost always a mortice lock and a nightlatch (often called a Yale lock). They work in entirely different ways, they serve different purposes, and together they form the standard security combination that UK insurers expect on a timber front door. This guide explains both locks clearly, tells you what to look for on your own door, and helps you decide whether your current setup is doing its job.
## What Is a Mortice Lock, and Why Does It Sit Inside the Door?
A mortice lock is a lock that is fitted inside a pocket — called the mortice — that is cut into the edge of the door itself. Because the lock body sits within the door rather than on its surface, it is much harder for an intruder to attack from outside. When you turn the key, a bolt shoots out horizontally from the edge of the door into a metal keep (a reinforced plate) set into the door frame. That bolt is thick, solid, and cannot be pushed back without the correct key — which is what makes a mortice lock the primary security lock on most UK front doors. Unlike a nightlatch, a mortice lock does not snap back on its own when you close the door; you have to turn the key deliberately to lock it and again to open it.
The most important distinction you will see on mortice locks is the number of levers inside. A 2 lever mortice lock has two internal levers that the key must lift to the correct height before the bolt can move. This is a low-security option — fine for internal doors but not recommended for a front door. A 5 lever mortice lock has five levers and is significantly harder to pick or manipulate. More importantly, if your home contents insurance policy specifies a deadlock on the front door, it almost certainly means a 5 lever mortice lock that meets British Standard BS3621. If your insurer asks and you only have a 2 lever mortice lock fitted, you could find a claim rejected. When in doubt, check the keyhole: a 5 lever lock typically has a larger, more substantial keyhole profile than a 2 lever version.
## What Is a Nightlatch, and What Does a Rim Lock Actually Do?
A nightlatch — widely known by the generic name Yale lock — is what most people mean when they talk about their latch. It is a rim lock, meaning the lock mechanism is mounted on the inside surface of the door rather than inside it. The spring-loaded latch bolt sits in a rim cylinder that passes through the door, and the outer barrel (the round part you see from outside) accepts your key. When you close the door, the angled latch springs into the keep automatically — so the door is held shut without you having to do anything. Turn the key from outside, or press the knob or lever on the inside, and the latch retracts so you can open the door. This is why a nightlatch is sometimes called a rim cylinder lock: the cylinder is the barrel you insert the key into, and the rim describes how the body is fixed to the door surface.
Here is the critical thing most homeowners overlook: a standard nightlatch does not deadlock the door on its own. If the nightlatch does not have a deadlocking feature (and many older ones do not), the latch bolt can be manipulated back using a thin piece of card or plastic slid between the door and the frame — a technique well-known to opportunist burglars. What is a rim lock offering if it can be defeated that easily? Convenience, essentially. The nightlatch gives you quick in-and-out access — you do not need to remember to turn a key to lock the door behind you — but it should never be your only lock. Some modern nightlatches have a deadlocking sash that prevents the bolt from being pushed back, which is a worthwhile upgrade if yours is an older model. Even so, it is the mortice lock below (or above) the nightlatch that provides the main line of defence overnight or when the house is empty.
## The Combination That UK Insurers Actually Expect
On a traditional timber front door in Forest Gate or anywhere else in London E7 and the surrounding E-postcode area, the expected setup is a 5 lever mortice deadlock (BS3621) alongside a nightlatch. Together they give you two independent locking systems: the nightlatch for quick daily use, the mortice deadlock for genuine security when the property is unoccupied or when you are in for the night. This is why it is called a deadlock — the bolt is dead, meaning it cannot move in any direction without the key. If you are on a letting agent's standard tenancy in Forest Gate, there is a good chance the landlord has been advised by their insurer to have exactly this combination in place.
The picture is different on uPVC and composite doors, which are increasingly common on newer builds and upgraded properties around the area. These doors use a multipoint locking system: when you lift the handle and turn the key, multiple bolts and hooks engage at several points up and down the door simultaneously. The cylinder that accepts the key on a uPVC door is a euro cylinder — and these cylinders have a known vulnerability called cylinder snapping, where an intruder can break the cylinder and operate the lock directly. If your front door has a euro cylinder, it is worth checking whether it carries the TS007 3-star rating or is at least anti-snap rated. Upgrading a euro cylinder on a uPVC or composite door is one of the most cost-effective security improvements you can make, and it is something our team carries out as part of door lock replacement London calls every week. If you are unsure what you have, call 020 3757 6136 and we can advise you before we come out.
## When You Need Both Locks — and When Something Is Wrong
There are a handful of common situations where knowing the difference between your mortice lock and your nightlatch matters practically. First, if you are locked out: if you have only pulled the nightlatch behind you and not turned the mortice key, there may be options available to a professional that are far less destructive than if the mortice is fully engaged. A trained locksmith can often open a nightlatch with minimal intervention — always after verifying that you are the occupant. If the mortice deadlock is engaged as well, the work is more involved, which is relevant to how the final quote is put together (the type of lock, time of day, what parts may be needed, and travel to your postcode district are all factors — and we confirm an exact price before any work begins).
Second, if a lock is not working smoothly — a key that is stiff, a bolt that will not shoot fully home, or a latch that no longer springs back — that is not a cosmetic problem. A partially engaged mortice bolt or a latch that is not catching properly leaves your door effectively unsecured. The same applies if the keep (the plate in the door frame) has worked loose or the frame itself is damaged. These are situations where a 24 hour locksmith London team can carry out upvc door lock repair London or timber door repair on the same visit rather than leaving the problem for another day. Third, if you have recently moved into a rented flat or bought a property, you do not know who else holds keys to the existing locks. Changing the cylinder on the nightlatch and replacing the mortice lock — a lock change London — is straightforward and means only you hold the keys from that point forward. It is one of the most sensible things a new tenant or buyer can do, and something we handle regularly across Forest Gate and the wider east London area.
## Practical Tips for Keeping Both Locks in Good Condition
Mortice locks are largely maintenance-free, but they do benefit from an occasional application of graphite powder (not oil, which attracts dirt) into the keyhole if the key becomes stiff. Never force a key that is not turning smoothly — this can shear the key inside the lock, which turns a simple maintenance job into an emergency locksmith London call-out. Keep the keep plate screws tight and check that the bolt engages fully into the keep when locked; if the door has dropped slightly on its hinges (common on older timber doors), the bolt may be catching on the edge of the keep rather than shooting cleanly into the pocket, and over time this will damage both the bolt and the keep.
Nightlatches benefit from a small amount of lock lubricant on the latch mechanism periodically, and the exterior cylinder should be kept clear of paint — it is surprisingly common for a rim cylinder to be inadvertently painted over during decorating, which eventually makes it stiff or even inoperable. If your nightlatch has an interior snib (a small lever that holds the latch back), test it now and then to ensure it is not accidentally left engaged, which would mean the door is on the mortice alone. For exterior door knob with lock and key combinations — where the knob operates the latch and the key the cylinder — check that the knob is not loose on its rose, as a wobbly knob can indicate a failing mechanism inside. If anything feels wrong, it is far better to have it looked at before it fails than to discover the problem at eleven o'clock on a Friday night. We are available around the clock — call 020 3757 6136 and we will send a locksmith straight away, usually with you in about 30 minutes.
## Forest Gate Locksmith: 24/7 Help with Both Locks
Our team works across Forest Gate, Stratford, Manor Park, Upton Park and the surrounding E7, E6, E12 and E13 postcode districts every day of the year — including evenings, weekends and bank holidays. Whether you need a 5 lever mortice lock fitted to meet your insurer's requirements, a nightlatch cylinder replaced after moving into a new flat, a uPVC door lock repaired after a break-in attempt, or simply sound advice on what your front door is actually doing for your security, we can help. We carry a wide range of mortice locks, rim cylinders and euro cylinders on the van so that most work can be completed on the first visit without a return trip for parts.
Being a 24 hour locksmith London team means we do not operate a reduced service after hours — the same experienced locksmiths who work Monday mornings also work Sunday nights. We are fully insured, and we confirm an exact quote on the phone before anyone travels to you, so there are no surprises when we arrive. If you are standing outside your door in Forest Gate right now, or if you are planning ahead and want to upgrade your locks, the number to call is 020 3757 6136. We answer every call, any time.
Frequently asked questions
What is the difference between a mortice lock and a deadlock?+
The terms are often used interchangeably in everyday speech, but strictly speaking a deadlock is a type of mortice lock — specifically one whose bolt can only be moved by a key (from either side) with no spring or handle mechanism to retract it. A mortice sashlock, by contrast, also has a latch bolt operated by a handle as well as a deadbolting function. When your insurer or the British Standard BS3621 refers to a deadlock on a front door, they mean a mortice deadlock: a 5 lever mortice lock fitted inside the door edge whose bolt is entirely key-operated and cannot be pushed back by hand.
Can I rely on my nightlatch alone to secure my front door overnight?+
Not reliably. A standard nightlatch — a rim lock where the latch springs shut automatically when you close the door — provides convenience but limited security on its own. Many older nightlatches can have their latch bolt manipulated back without a key if there is any gap between the door and frame. Even a deadlocking nightlatch, which prevents the bolt being pushed back, is still a surface-mounted mechanism that is easier to attack than a mortice lock set into the door body. For overnight or when the property is empty, your mortice lock should always be engaged as well.
How do I know if my mortice lock meets my home insurance requirements?+
Most household insurers require a 5 lever mortice deadlock on the front door, and many specifically require it to meet British Standard BS3621. You can check whether yours is BS3621-rated by looking for the kitemark stamped on the lock body (visible if you open the door and examine the edge of the door where the bolt sits) or by checking the paperwork that came with the property. If you are unsure, our team can inspect and identify the lock on a visit and advise whether an upgrade is needed. We carry BS3621-rated locks on the van for same-visit replacement.
My uPVC front door does not have a mortice lock or a nightlatch — is it less secure?+
Not necessarily, but it works differently. uPVC and composite doors use a multipoint locking system operated by lifting the handle before turning the euro cylinder key. When fully locked, multiple bolts engage at several points up and down the door, which is a strong system. The main vulnerability is the euro cylinder itself: a standard cylinder can be snapped, allowing the lock to be operated without a key. Fitting an anti-snap or TS007 3-star rated euro cylinder removes this risk significantly. If your uPVC door euro cylinder has not been upgraded since the door was fitted, it is worth calling 020 3757 6136 — we can replace it on the same visit and advise on whether the multipoint mechanism itself needs attention.
