Home Insurance Lock Requirements | How to Check Before Your Claim Gets Rejected

Your insurer will pay out. Right up until they don't.

Most homeowners in Bawtry and across the DN10 area carry contents or buildings insurance for years without ever reading the security schedule. That's the page, usually buried around clause 4 or 5, that lists exactly what locks you must have fitted for the policy to be valid. Not recommended. Must have. The difference matters enormously when you've had a break-in and you're standing in your kitchen at 11 p.m. watching a loss adjuster take photographs.

This post is about the specific clauses that catch people out, how to check your property against them right now, and what 'like-for-like' replacement actually means in practice (hint: it's not what most locksmiths or handymen do by default).

---

What the Policy Actually Says

Insurers don't write their own lock standards from scratch. They reference published British Standards and, occasionally, industry certification schemes. The three you'll see most often:

The phrase you'll see in the small print is usually something like: "all final exit doors must be secured by a mortice deadlock conforming to BS3621, or a multipoint locking system with a BS3621-approved deadbolt."

Pause on the words 'final exit door.' That clause does a lot of work.

---

The Final Exit Door Clause

A 'final exit door' is any external door you can leave the property by. Not just the front door. Your back door. The side gate door if it leads directly outside. The door from an integral garage into the garden, if the garden isn't otherwise enclosed. Possibly the conservatory door, depending on your policy wording.

Most people lock the front door properly and leave the back door on a basic upvc multipoint that was fitted in 2003 when the extension went up. The lock itself might be a Fuhr or GU hook mechanism, perfectly functional day-to-day, but if it doesn't incorporate a BS3621-certified deadbolt (many older multipoints don't), you're potentially non-compliant on that door regardless of what's on the front.

Check your policy. Find the phrase 'final exit door' or 'all external doors.' If it says all, it means all.

What Counts as Compliant on a uPVC Door?

This is where it gets specific. A uPVC or composite door with a multipoint locking system isn't automatically BS3621-compliant just because it has multiple hooks and bolts. BS3621 for multipoint systems requires:

• At least one deadbolt (square-cornered, non-spring-loaded) that projects a minimum of 13mm
• The lock body to carry the kitemark, or be certified by a UKAS-accredited body
• Key operation from outside, and from inside unless the policy specifically permits BS8621 egress-without-key variants

Brands that manufacture BS3621-certified multipoint lock bodies include ERA, Maco, Roto, Mila, and Winkhaus, among others. But you can't assume a door has one fitted just because it looks like a decent lock. The only way to know is to look at the faceplate or gearbox for the kitemark symbol and the standard number, or to check the installation paperwork if you have it.

If the door was fitted by a window company and you've never thought about it since, there's a reasonable chance the paperwork has gone. In that case, call us or check the lock body yourself: the kitemark is usually stamped or cast directly onto the metal.

---

The Window Lock Clause

Second most common source of rejected claims. Almost every home insurance policy that's been issued in the last ten years includes a clause along these lines:

"All accessible windows must be fitted with key-operated window locks."

Accessible usually means any window that can be reached from ground level, or from a flat roof, outbuilding, or extension roof that a person could reasonably stand on. That covers a lot more windows than people assume. The bay window in the front bedroom. The bathroom window above the kitchen extension. The study window over the garage.

Key-operated is the operative term. A window stay, a cockspur handle, a friction hinge, a push-lock. None of those are key-operated. None of them satisfy the clause.

On a standard casement window, compliance means either:

• A lockable cockspur handle (turn to open, key to lock)
• A surface-mounted window lock, the kind with a separate key, screwed to the frame and the opener
• A locking espagnolette (common on modern uPVC casements with a multipoint window lock operated by lifting the handle and turning the key)

On sash windows, the requirement is usually a sash lock or sash stop with key operation, or dual screws.

For properties in Misson, Austerfield, or Blyth with older timber windows, this is often the issue. The windows have stays and cords and lovely old ironmongery, none of which locks with a key. Surface-mounted key locks are cheap and easy to retrofit, around £8 to £15 per window fitted yourself, and they'll satisfy most insurers.

Trickier: Skylights and Roof Windows

Velux and similar roof lights that open (as opposed to fixed rooflights) are technically windows. If they're accessible from an adjacent flat roof, which is common on 1970s and 1980s bungalows in Harworth and Rossington, a policy that says 'all accessible windows' may include them. Most don't come with key locks as standard. Velux sells a key-locking stay accessory for its older FK and SK series. Worth checking if you have a bungalow.

---

Why Like-for-Like Replacement Is a Trap

Here's the scenario. Your door lock fails. You call a locksmith, or you go to B&Q, and you replace it with the same model. Job done.

Except the same model might have been discontinued, and what's available now under the same name isn't identical. Lock ranges get updated. An ERA or Yale rim lock that was BS3621-certified in 2012 may have been replaced by a superficially similar product that isn't, or carries a different certification variant. The branding is the same. The listing looks the same. The compliance isn't.

This also happens with multipoint gearboxes. A GU or Maco gearbox that a window company fitted in 2008 gets replaced by a locksmith with a generic multi-point body because it fits the existing keep positions and the customer wants it cheap. Generic multipoint bodies are often NOT BS3621-certified. They work mechanically. They're just not certified. If you've had this done and assumed it was fine because the lock works, it's worth checking.

The rule: any time a lock is replaced on an external door, ask for confirmation that the replacement meets BS3621 (or BS8621 where appropriate). A locksmith who knows their job will tell you this without being asked. One who doesn't might not mention it at all.

A BS3621 mortice deadlock from a reputable brand (Yale, ERA, Lockmaster) typically costs £35 to £65 for the lock body, plus fitting. The total bill for a compliant replacement on a timber front door in Bawtry is usually £90 to £140. It's not a significant amount relative to what you're protecting.

---

Anti-Snap Cylinders and Your Policy

Most policies don't explicitly require an anti-snap cylinder. They reference the door being 'locked' and compliant with BS3621 or equivalent. Snapping the cylinder and operating the lock mechanism from inside is the attacker's problem, not a lock standard failure in the insurer's eyes, as long as the lock body itself is certified.

However. If you can demonstrate that the property was secured with a TS007 3-star cylinder or an SS312 Diamond-rated cylinder (Avocet ABS, Ultion, Mul-T-Lock, and others), you're in a stronger position if the insurer tries to argue that the door was left insecure. The police refer locksmiths to Secured by Design guidance, and a loss adjuster who's looking for a reason to reduce a payout will have a harder time if the cylinder spec is clearly above minimum.

Some insurers now actively advertise discounts for Secured by Design-compliant properties. If yours does, that's written evidence that the standard is relevant to your cover. Keep the receipt and the box for any cylinder you have fitted.

---

A Practical Check: Work Through Your Property

You don't need a locksmith for this part. An hour on a weekend afternoon, a torch, and access to your policy document.

Front door

• Is there a mortice lock? Find the keyhole in the door edge or face. If yes: is there a kitemark on the faceplate? Does it reference BS3621?
• Is it a uPVC or composite with multipoint? Look at the lock body (gearbox) in the door edge. Kitemark and BS3621 or not?
• Does it lock from outside with a key, and from inside? (BS3621 requires both. BS8621 allows inside egress without key.)

Back door and any other external doors

• Repeat the above. Don't skip this.
• A back door with just a night latch (Yale-style snib lock) is not BS3621-compliant. A night latch plus a separate BS3621 mortice deadlock below it is.

Windows, ground floor and any accessible upper floor

• Try each handle. Does it require a key to lock? If it just lifts or turns without a key, it's not a key-operated lock.
• If any window is within reach of a shed roof, flat-roof extension, or outbuilding, treat it as accessible.

Check your policy wording

Look specifically for: - The words 'final exit door' or 'all external doors' - 'BS3621' or 'British Standard' - 'Key-operated window locks' or 'window locks' - Any clause about what renders the policy void or reduces cover

If you can't find the policy document, your insurer is legally required to provide it. Download the schedule and the full policy wording (these are often two separate PDFs).

---

Landlords: You Have Extra Exposure

If you're renting a property in DN10 or nearby in Doncaster, Retford, or Tickhill, the compliance question sits with you, not the tenant. You're responsible for ensuring the building meets whatever security standard your landlord's insurance requires. If a tenant replaces a lock, fits a different cylinder, or props open a window lock that breaks, and you don't know about it, you're still the one whose claim gets queried.

Built into a tenancy agreement should be a clause about not changing locks without consent, and a periodic inspection that includes checking external lock compliance. That's not intrusive landlordism; it's what an insurer expects and what your policy probably already requires you to do.

If you manage a house in multiple occupation (HMO), the picture is more complicated because there are also fire safety requirements that interact with lock compliance. BS8621 egress-without-key locks are often specified for HMOs precisely because of fire escape obligations. That's a whole separate conversation, but the short version: BS8621 and BS3621 don't mean the same thing, and fitting the wrong one means being non-compliant with either fire regs or your insurance, or both.

---

New Builds and Replacement Doors: PAS24

If you've had a new front door fitted since around 2015, particularly a composite door from a trade installer or a national double glazing company, the sales literature probably mentioned 'PAS24 tested.' PAS24 is a doorset performance test, not a lock standard. It tests the whole assembly: door, frame, glazing, and hardware together, under physical attack for a set duration.

A PAS24-tested door does satisfy most insurers' requirements for the main entrance. But only if it was installed correctly and the hardware hasn't been changed since. If someone has retrofitted a different cylinder, or if the door has been rehung without the original certified frame, the PAS24 status no longer applies. The test is for the system as tested, not the door leaf alone.

For reference, a PAS24-compliant composite door from a reputable local installer in Bawtry typically costs £1,400 to £2,200 fitted. It's worth asking for the test certificate at the time of installation and keeping it with your property records.

---

The One Document to Find Before You Need It

Your policy schedule and full policy wording. Not the renewal summary. The full document with the exclusions and the conditions.

Download it. Print the security conditions page if that helps. Check your locks against it this weekend. If anything doesn't match, the cost of fixing it is trivial compared to having a claim declined after a break-in.

If you find something you're not sure about, a compliant lock fitting at a Bawtry property costs less than the average excess on a home insurance claim. That's not a slogan; it's arithmetic.

---

If you're in Bawtry or anywhere across the DN postcodes and want someone to check compliance or fit a correctly-certified replacement lock, Rapid Response covers the area, including Austerfield, Martin Common, Finningley, Misson, Harworth, Rossington, and the surrounding villages. Average arrival under 30 minutes where we can manage it. Pricing is given honestly when you call, before we come out. No obligation to go ahead if you'd rather sort it yourself once you know what you're dealing with.