Home Insurance Lock Requirements | How to Check You're

A burglar kicks your back door in on a Tuesday night in Radford. You call the police, board up, get a locksmith out, then phone your insurer. A few weeks later a letter arrives. Claim declined. Reason: the mortice lock on the final exit door didn't meet the minimum standard stated in your policy schedule.

That is not a hypothetical. It happens, and it happens more often than insurers publicise and more often than most policyholders ever think to check. The lock on that door worked fine. The door wasn't the weak point in the break-in anyway. But the policy said BS3621, the lock wasn't certified to BS3621, and that was that.

This post is about reading your insurance small print on locks before you need to make a claim, understanding what the clauses actually require, and checking your own property against those requirements today.

Why Insurers Specify Locks at All

Home insurers use lock requirements to segment risk. A property with a five-lever mortice deadlock and a multi-point locking door handle is statistically harder to enter quickly than one with a two-lever deadlock and a night-latch. Insurers know this because claims data tells them so. They write minimum standards into the policy to price that risk correctly, and they reserve the right to decline a claim if the property wasn't maintained to that standard.

The standard they most commonly reference is BS3621. Published by the British Standards Institution, it covers key-operated locks for doors. To earn the kitemark, a lock must withstand at minimum 1,000 newton force applied to the bolt, pass a pick resistance test, pass a drill resistance test, and use a key with at least 1,000 differs (combinations). A two-lever lock from a DIY shed won't come close. A five-lever Chubb, Yale, or ERA lock with the BS3621 kitemark will.

Some insurers now reference BS8621, which is the same standard applied to locks that can be opened from the inside without a key. That matters for final exit doors, which I'll come to shortly.

A smaller number of policies reference TS007 or PAS24. TS007 is a cylinder standard, not a lock standard. PAS24 is an enhanced security test for complete door sets. If your policy cites these, it's usually for the cylinder in a multi-point lock rather than the lock body itself.

The Final Exit Door Clause

This is the one that catches people most often. Read your policy carefully and you'll likely see wording along the lines of: all external doors must be fitted with a BS3621 mortice deadlock, except the final exit door which must be fitted with a BS8621 or equivalent mortice lock or an approved multi-point locking system.

The logic is simple enough. You can't deadlock a door from the outside if you're still inside. Your final exit door, usually the front door, needs a lock you can operate without a key from the inside. BS8621 covers exactly that: a five-lever mortice sashlock where the bolt is key-operated from outside but can be turned back from inside by a handle or thumb-turn.

The problem is that most people don't know which door their insurer considers the final exit door. And the problem after that is that many front doors, especially on 1960s and 70s semi-detached houses in Bulwell, Bestwood, and parts of Clifton, still have nothing more than a Yale-style rim nightlatch. A nightlatch isn't a deadlock. It's not BS3621. It's almost certainly not what your insurer means.

On uPVC and composite doors, the multi-point locking system (the long strip of hooks, bolts, and rollers driven by lifting the handle and turning the key) is usually acceptable as a final exit door lock, provided the cylinder meets the insurer's standard. But 'usually acceptable' is doing some work in that sentence. Check the wording. Some policies explicitly name an acceptable multi-point standard. Some don't say, and you'd need to phone the insurer directly.

The Key-Operated Window Lock Clause

Almost as common, significantly more ignored. Most policies include a clause requiring key-operated locks on all accessible ground-floor windows, and sometimes first-floor windows that can be reached from a flat roof, extension, outbuilding, or drainpipe.

The word 'accessible' is doing the work here, and it's not always defined. Courts, bay windows, sash windows at the front on a terraced house in Lenton or Sneinton, a side-return window in a Wollaton semi: all of these could reasonably be considered accessible. Your insurer's assessor, reviewing a claim after the fact, may take a broader view of 'accessible' than you did.

Key-operated window locks come in several forms. On uPVC casement windows, the handle itself is often lockable with a small key. On timber sash windows, a sash stop or Brighton fastener with a key lock is the common solution. On older steel-framed windows (still present in some interwar properties around Carlton and Gedling), there are specific clamp-type locks that work without needing to drill the frame.

A standard cockspur handle with no lock, a fitch fastener, or a push-button child safety restrictor doesn't count. The insurer wants a key-operated device.

Here's the practical check: go to every ground-floor window. Try to open it without a key. If you can, it's not a key-operated lock and it won't meet the clause.

Like-for-Like Replacement: Where Compliance Disappears

This is a subtler trap and it catches landlords particularly hard. A tenant reports that the back door lock is broken. The maintenance contractor replaces it with a new five-lever mortice lock. Job done, door secure, lock shiny.

Except the old lock was BS3621 certified and the replacement, bought from a general hardware supplier, isn't. It looks identical. It has five levers. But it has no kitemark, no certification number, no BS3621 designation on the box. Whether it would actually perform to that standard in a forced entry is unknowable, because it hasn't been tested.

The insurer doesn't care how it performs. The policy says BS3621. The lock doesn't carry that certification. If there's a claim, there's a gap.

The same thing happens with cylinders on uPVC doors. A cylinder wears out or gets damaged. Someone buys a replacement from a pound shop equivalent, fits it, and considers it done. The original cylinder might have been a TS007 3-star or Sold Secure Diamond rated product. The replacement is neither. The door is now non-compliant with the policy.

Always buy from a supplier who can show you the certification. Lock brands that publish their standards clearly include Yale (their Superior range carries BS3621), ERA, Avocet ABS, Ultion, Mul-T-Lock, and for cylinders, products in the TS007 3-star category from several of those same manufacturers. The certification should be on the packaging. If it isn't, don't assume.

How to Read Your Own Policy Schedule

Policies vary considerably between insurers. What follows is a practical approach to checking your own documents.

Step 1: Find the Security Requirements Section

It's usually called 'Security Requirements', 'Locks and Security', or 'Property Conditions'. It may be in the main policy wording document or in a separate schedule. Some insurers bury it in the definitions section under 'Warranted' or 'Condition Precedent'.

The phrase 'condition precedent' matters. A condition precedent means the insurer's liability to pay doesn't arise at all if the condition wasn't met, regardless of whether the breach contributed to the loss. If your window lock clause is a condition precedent and you didn't have key-operated locks on accessible windows, you may not receive a penny even if the burglar came in through the back door.

Step 2: List Every Door and Window Category Mentioned

Typically you'll find:

• Final exit door (front door in most cases)
• Other external doors (back door, side door, garage door connecting to house)
• Accessible windows (ground floor, sometimes defined further)
• Garage/outbuilding doors if they connect to the main structure
• Patio doors and French doors (often a separate clause requiring multi-point locking or a security bar)

Write these down. Then walk round the property and map what you've got against what the policy says.

Step 3: Check the Standard Cited for Each Category

For each category, the policy will either name a British Standard (BS3621 is most common), name a generic requirement ('five-lever mortice deadlock'), or specify a quality ('insurance-grade' or 'insurance-approved').

'Insurance-grade' without a named standard is vague, but courts have generally held it to mean BS3621 for mortice locks. Don't assume a higher-spec lock means you're automatically covered. The question is whether it meets the named standard, not whether it's expensive.

Step 4: Verify the Certification on Your Actual Locks

For a mortice lock, open the door and look at the faceplate (the metal strip in the edge of the door). Many BS3621 locks have the standard stamped or printed there. Some have it on the main body. If there's no marking, check whether you have the original packaging or can find the manufacturer's product code and look it up.

For a cylinder on a uPVC door, the brand name is usually visible on the face of the cylinder. Cross-reference that brand and model against TS007 3-star certification lists. The Master Locksmiths Association and Sold Secure both publish searchable databases.

If you can't confirm certification and the lock has been there for years without any paperwork, that's your answer. You don't know it's compliant. Act on that.

Patio Doors, French Doors, and Bi-Folds

These are their own category because the lock mechanisms are so different from a standard mortice. Most insurers accept multi-point locking on sliding patio doors, provided the patio door lock is operated by a key rather than just a handle. A patio door that locks by lifting a handle with no key operation is not going to satisfy most policy wording.

For additional security, some policies require or recommend an anti-lift device or a patio door security bar fitted into the track. These cost around £15 to £40 and take ten minutes to fit. They won't satisfy a lock requirement clause by themselves, but some policies list them as a supplementary requirement alongside the multi-point lock.

Bi-fold doors are a growing presence in NG postcodes from West Bridgford down to Long Eaton, fitted to extensions everywhere. The locking hardware on bi-folds is manufacturer-specific and the quality varies enormously. Brands like Maco, Roto, Mila, and Winkhaus supply hardware to bi-fold fabricators, and their better-grade systems do meet security standards. But the budget-end systems fitted to cheap bi-fold packages frequently don't. If you have bi-folds, find out what hardware is fitted and check whether the insurer's wording covers them under the French/patio door clause or treats them separately.

Rented Properties: Whose Problem Is It?

Landlords in Nottingham, particularly those with HMO stock in Lenton, Dunkirk, and the Arboretum area, or single-let terraces in Hyson Green and Radford, carry this compliance risk directly. The buildings insurance is in the landlord's name. The locks are the landlord's responsibility to maintain to policy standard. Tenants don't read the policy schedule.

If a maintenance contractor does a like-for-like replacement without checking certification, and then there's a burglary, the landlord has the problem. Not the tenant. Not the contractor (unless there's a specific agreement).

Some landlord insurance policies are even more prescriptive than standard home insurance. They may require Secured by Design-compliant hardware or specific standards on door frames as well as locks. It's worth an annual check against the current policy, not just when the property is acquired.

Contents insurance for tenants is a separate policy and usually has its own security clauses. That's the tenant's responsibility to check. But as a landlord, it's reasonable to document what lock standard is fitted at each property and provide that to tenants so they can satisfy their own insurer if they need to.

A Quick Reference Table

Here's a summary of what most standard home insurance policies require. Check your own policy: this is the typical position, not a universal one.

What to Do If You Find a Gap

You've checked. Something doesn't comply. Here's the order of action.

First, don't panic about historic non-compliance. You can't claim on a past event, but you can fix the property now and be covered going forward.

Second, for mortice locks, a BS3621 five-lever mortice deadlock from a reputable brand costs between £35 and £90 for the lock body. Fitting by a locksmith in Nottingham typically runs £60 to £100 including labour, depending on whether the door needs any prep work. A BS8621 sashlock for a final exit door sits in a similar price range.

Third, for cylinders, a TS007 3-star cylinder from Avocet ABS, Ultion, or similar runs £25 to £60. Fitting is straightforward if the existing cylinder is the right size, under half an hour's work.

Fourth, for window locks, budget £8 to £20 per window for the hardware. On uPVC windows, lockable handles are a direct swap for the existing handle. On timber sashes, a locksmith or competent joiner can fit sash stops.

Fifth, once you've made changes, document them. Keep the packaging. Take a photograph of the faceplate or cylinder face showing the brand and any certification markings. If you used a locksmith, keep the invoice.

Some insurers will ask you to notify them of security upgrades. Some will reduce your premium. All of them will want evidence if a claim arises, and having that documentation costs nothing to maintain.

Before You Phone Your Insurer to Ask

If you're genuinely unsure what your policy requires and the document is unclear, phone the insurer before there's an incident. Ask specifically:

• Does BS3621 cover my final exit door or do you require BS8621?
• Do you require key-operated locks on all ground-floor windows, or only those you consider accessible?
• For a uPVC door with multi-point locking, what cylinder standard do you require?
• Is this requirement a condition precedent?

Get the answers in writing if you can. An email confirmation of what they told you is worth keeping.

Insurers are generally helpful at the point of checking compliance. They're considerably less helpful once a claim is in dispute.

If you need locks checked, replaced, or upgraded across a Nottingham property, Fort Secure covers NG1 through to NG11 and the surrounding postcodes including West Bridgford, Beeston, Arnold, and Hucknall. Average arrival in 30 minutes or less where possible. Pricing is given honestly on the call before we arrive, not after. There's no charge for checking whether what you have is compliant before any work is agreed.