Home Insurance Lock Requirements | How to Check You're

Your insurer pays out after a break-in. That's the deal. Except there's a page or two of conditions buried in your policy schedule that say otherwise, and most people don't read them until they're sitting across from a loss adjuster who just has.

Lock requirements are one of the most common grounds for a rejected or reduced burglary claim in the UK. Not because insurers are being clever, but because homeowners genuinely don't know what their policy specifies, and locksmiths who do like-for-like replacements often don't ask. The result is a house that looks secure, probably feels secure, and technically isn't, by the definitions that matter when you need to claim.

This isn't a horror story piece. It's a field guide. Work through the checks below on your own property, cross-reference your policy wording, and you'll know exactly where you stand.

What Policies Actually Say (And Where to Find It)

Most home insurance policies state their lock requirements in one of three places: the main policy document, the schedule that arrives when you buy or renew, or a separate "security requirements" or "home security" endorsement. The endorsement sometimes overrides the main document, which is where people get caught.

Search the document for the words "locks", "mortice", "deadlock", and "British Standard". The phrase you're looking for most often reads something like:

"All final exit doors must be fitted with a five-lever mortice deadlock conforming to BS3621, or a multipoint locking system fitted with a cylinder conforming to BS8621."

That's fairly standard wording. But the variations matter enormously.

The Three Things the Wording Controls

Which doors. Most policies distinguish between "final exit doors" (usually the front and back doors you actually use to leave the house) and other doors. French doors and patio doors sometimes fall into a third category with their own requirements. Garage-to-house doors often appear explicitly. Check whether your policy treats your rear access gate separately if it leads directly into the house.

Which lock standard. BS3621 is the most cited standard. It specifies a five-lever mortice deadlock tested for pick resistance, key manipulation, and attack resistance (bolt strength, cutters on the box staple, 1,000 kg tensile load on the bolt). If your policy says BS3621, a four-lever lock doesn't satisfy it. Neither does a five-lever lock that simply claims to be five-lever without a BS3621 kitemark on the keyway.

Which cylinder standard. For multipoint locks on uPVC and composite doors, the policy usually references BS8621 for the lock body and, increasingly, TS007 3-star or SS312 Diamond Grade for the cylinder. These are not the same thing. A BS8621-kitemasked lock with a standard euro cylinder is not the same as a BS8621 lock with a TS007 3-star cylinder, even if the policy doesn't spell that out in syllables. Some insurers do spell it out. Read yours.

The Final Exit Door Clause

This is the one that catches people most often. The clause typically requires that every door you use as an exit, when the house is empty, is locked to the policy standard. Not just deadlocked in theory. Actually locked, with a key, when you leave.

The practical problem: multipoint locks on uPVC doors lock on the handle lift. The euro cylinder then turns to deadlock the bolts. Many people lift the handle, close the door, and walk away without completing the cylinder turn. The door looks closed and feels solid. But the bolts are only nightlatched, not deadlocked, and technically the policy condition hasn't been met.

Some insurers take the position that if there's evidence a door wasn't properly locked at the time of a break-in, they won't pay out in full. The excess may still apply. In some cases the claim is reduced rather than voided. Either way, it's not a conversation you want to have.

What to do: Get into the habit of completing the full lock cycle on every exit. Turn the cylinder. Check the handle doesn't depress without the key. If anyone in your household (or a carer who visits, or a teenager who keeps forgetting) is inconsistent about this, consider whether a door with auto-deadlocking capability is a worthwhile upgrade.

The Like-for-Like Replacement Problem

A locksmith fits a new cylinder after a break-in or a lost key. They source a 6-pin euro cylinder that physically fits the lock case. Job done. Except:

• The original cylinder may have been TS007 3-star rated. The replacement is TS007 1-star.
• The original may have been Sold Secure Diamond (SS312). The replacement is unrated.
• The policy may require an anti-snap cylinder on any door with a multipoint lock.

A like-for-like replacement in the physical sense (same size, same cam, same brand profile) is not necessarily a like-for-like replacement in the standards sense. If your Avocet ABS cylinder gets swapped for a standard ERA euro because that's what the van carries, you've probably dropped a grade you didn't notice losing.

You can check a cylinder's rating before any locksmith leaves. Ask them to tell you the TS007 star rating and whether it appears on the Sold Secure product database. Both are searchable. If they can't answer, that tells you something.

A Note on Cylinder Brands and Ratings

TS007 3-star and Sold Secure Diamond are the two ratings most commonly referenced in enhanced insurance requirements and Secured by Design specifications. A TS007 1-star cylinder combined with a TS007 2-star door furniture can also achieve 3-star under the composite rating rule, but that requires both components to be present and specified together. Don't assume the door furniture counts unless a locksmith confirms both are fitted and rated.

Key-Operated Window Lock Clauses

Some policies include a window lock requirement, phrased as "all accessible windows must be fitted with key-operated locks". "Accessible" usually means ground floor, and any upper floor window that could be reached from a flat roof, garage, extension, or drainpipe.

The clause is often buried under "General Conditions" rather than with the door lock requirements. It's easy to miss.

Two things to check:

Are your window locks actually key-operated? Many uPVC windows have cockspur handles that lock with a turn. Some of these are lockable with a separate key; many are not. A cockspur handle that merely stiffens to a locked position with thumb pressure is not a key-operated lock for insurance purposes. If you're not sure, pull the handle hard when it's in the locked position. If it gives, it's not keyed.

Are the locks fitted or just present? Window locks left in a drawer don't satisfy the condition. They need to be on the window. A surveyor or loss adjuster after a break-in where a window was forced will look at whether the locks were fitted and in use, not whether you own some.

Winkhaus and Mila both make casement window locks that are genuinely key-operated and straightforward to retrofit. Costs run from about £8 to £15 per window for the lock itself, plus fitting time if you're not doing it yourself. For a semi in Stopsley or a terraced house in Bury Park with six or seven accessible windows, you're looking at under £150 for parts. Against the implications for a claim, that's not a difficult calculation.

Checking Your Own Policy: A Walk-Through

Here's a process that takes about 20 minutes the first time.

Step 1. Open your policy document and your schedule. Both, separately. Search for: "lock", "mortice", "deadlock", "cylinder", "British Standard", "BS3621", "BS8621", "TS007", "window", "key-operated". Note every result.

Step 2. List every external door in your property. Front door. Back door. Side gate door if it accesses the house directly. Internal garage-to-house door (yes, this counts on many policies as it's an external access point). French doors. Patio doors. Any door from a lean-to or conservatory that connects to the house.

Step 3. For each door, identify the lock type: - Mortice deadlock: check for a BS3621 kitemark on the lock face or in the original documentation. Five-lever with a kitemark is compliant. Without the kitemark, even a five-lever lock isn't confirmed as meeting the standard. - Multipoint lock: check the gearbox for a kitemark. Check the cylinder for its TS007 or SS312 rating.

Step 4. List every accessible window. Check whether each has a key-operated lock fitted and functional.

Step 5. Compare your list against the policy wording. Mark any gap.

That's it. You now know whether you're compliant or not. Most people find at least one gap they didn't expect.

What the Multipoint Lock Kitemark Actually Covers

BS8621 is the standard for multipoint locking systems on doors. It tests the lock body, not the cylinder. A door lock with a BS8621 kitemark on the gearbox has been tested for:

• Deadlocking by key only (the handle alone shouldn't be able to deadlock the bolts, because that could trap occupants)
• Bolt strength under load
• Manipulation and pick resistance of the lock body
• The requirement that the locked door can still be opened from the inside without a key (for escape)

What BS8621 does not test is the cylinder's resistance to snapping, picking, or drilling. That's where TS007 and SS312 come in, covering the cylinder separately. A door with a BS8621-kitemasked gearbox and an unrated euro cylinder has a tested lock body and an unprotected cylinder, which is where most actual attacks happen.

For properties in LU1, LU2, LU3, and LU4, anti-snap protection in the cylinder is genuinely relevant. Snapping is still the dominant attack method on uPVC and composite doors across Bedfordshire. An unrated euro cylinder on an otherwise solid door is a real gap.

When Compliance Costs Money: What's Realistic

If you find your door isn't compliant, here's what remediation typically costs in Luton:

Upgrading a euro cylinder to TS007 3-star (supply and fit): £70 to £110, depending on cylinder size and brand. An Ultion or Avocet ABS fitted by a locksmith at your property in, say, Wigmore or Round Green would typically sit in this range.

Upgrading or adding a BS3621 mortice deadlock (new lock, supply and fit): £130 to £200. On a timber back door in Farley Hill or Leagrave, this is a one-morning job.

Adding key-operated window locks (supply and fit, per window): £25 to £50. More if the frame needs drilling or the uPVC profile is awkward.

None of these are dramatic numbers against the context of a voided claim. The average burglary claim in England and Wales is around £3,000. The cost of getting the locks right is a fraction of that, and it also reduces the chance of the break-in happening at all.

A Word on Landlords

If you let a property, your landlord's insurance policy has the same lock conditions, and you're more exposed than an owner-occupier. Tenants change. Keys get copied, lost, or passed on. A tenancy may end with the locks unchanged. Some policies explicitly require a lock change between tenancies, particularly if keys were not fully recovered.

If you manage a rental in Houghton Regis, Caddington, or anywhere else in LU postcodes, check your landlord policy wording for any condition about key control or lock changes between lets. If the condition is there and you've not been meeting it, you need to decide whether to rectify that before you need to find out it matters.

The Check Before You Buy a New Policy

Most people buy home insurance by price comparison, accept the cheapest comparable quote, and never read the security requirements until a claim. There's a better approach.

Before accepting a quote, look up the security requirements section of that specific insurer's policy wording (these are usually available as PDFs on the insurer's website without buying). Check what they require against what you actually have. If your front door has a standard cylinder and the policy requires TS007 3-star, you either need to upgrade the cylinder or choose a different policy. Starting from compliance is much simpler than retrofitting after you've bought.

Some insurers offer a discount if you have Sold Secure Diamond-rated locks or a Secured by Design specification on the property. Ask the question. It doesn't always appear on the comparison site.

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If you're working through this and you're not sure what lock is actually fitted on a particular door, or whether a cylinder is rated or not, Locks Local covers Luton and the surrounding LU postcodes and can usually be with you in under 30 minutes. Pricing is given honestly on the call before anyone comes out. No obligation to have anything fitted; sometimes people just want to know what they've got.