Insurance-Approved Door Locksin South London

Most UK home insurers require a BS3621 5-lever mortice deadlock on final-exit timber doors, a TS007 3-star or Sold Secure SS312 Diamond euro cylinder on uPVC and composite doors, and key-operated locks on all accessible windows. Aviva, Direct Line, Admiral, Churchill, LV= and AXA all reference BS3621 or equivalent language in their policy schedules. If you live in a flat or HMO, BS3621 is replaced by BS8621 to satisfy fire-safety keyless-egress rules.

Open the door and look at the lock edge — the metal faceplate visible on the door's edge when open. On a mortice deadlock, the Kitemark oval with "BS3621" is engraved on the faceplate. On a euro cylinder, look at the cap where the key goes in: one star or three stars indicates TS007 rating. If you see no mark, it's almost certainly not compliant. Use our 60-second audit checklist above, or WhatsApp a photo and we'll confirm within 10 minutes.

Yes — if your policy schedule specifies "BS3621 or equivalent" and your claim involves a forced-entry burglary, the insurer is entitled to reduce or refuse the theft element of the claim when the locks don't meet that standard. We see this happen most often with homeowners who inherited 3-lever mortice locks from the previous owner without checking. Fitting compliant locks and keeping the locksmith's invoice on file is the strongest defence. It's not hypothetical — the Financial Ombudsman Service publishes regular decisions backing insurers on this.

A uPVC or composite door needs a multi-point locking system plus a TS007 3-star euro cylinder, or a 1-star cylinder paired with a TS007 2-star security handle. The 3-star cylinder is engineered to snap at a sacrificial break point instead of failing open — defeating the lock-snapping attack that causes most South London uPVC break-ins. Sold Secure Diamond (SS312) is accepted as equivalent by every major UK insurer.

Flats and HMO final-exit doors need BS8621, not BS3621. BS8621 has the same thief-resistance specification but allows keyless escape from the inside via a thumbturn — a fire-safety requirement under the Regulatory Reform (Fire Safety) Order 2005. Dual-certified BS3621/BS8621 locks are available and satisfy both insurance and fire law at the same time. Fitting the wrong standard on an HMO can trigger fines up to £5,000 per door.

A BS3621 5-lever mortice replacement is from £180 supplied and fitted. A TS007 3-star anti-snap cylinder upgrade is from £200. A full multi-point gearbox strip-out on a uPVC door is from £350 (or £450 for a complete rebuild). Every price is fixed before the van leaves, with no VAT, no call-out fee, and a 12-month workmanship guarantee. See our pricing table above for the full fixed-price list.

TS007 1-star cylinders are tested against picking, drilling and bumping — but not cylinder snapping. They must be paired with a TS007 2-star security handle that covers the cylinder protrusion to achieve 3-star total protection. A TS007 3-star cylinder (or Sold Secure Diamond SS312) resists all five attacks including snap attack, thanks to a sacrificial break section engineered into the cylinder body. Most insurers accept either combination provided the total door rating reaches 3-star.

Yes. Every major UK insurer specifies key-operated locks on all accessible windows — ground floor, windows above flat roofs or balconies, and basement windows. Handle-operated locks with no key are not insurance compliant because they can be slipped through broken glass. Window lock fitting is from £180 across South London and can be done on the same visit as your door compliance upgrade.

Some insurers offer a small discount (typically 2-5%) for homes fitted with BS3621 and TS007 3-star locks across all external openings. The bigger benefit isn't the premium — it's claim certainty. You're paying the same premium either way, but compliant locks mean the insurer can't reduce or refuse a theft claim on a technicality. Most homeowners save far more on one successful claim than they'd ever save on premium discounts.