Guide
BS 3621, TS 007 and What an Insurance Approved Lock Really Means
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Which Standard Applies for Your Door?
Start with the door’s hardware and its inside operation when choosing a standard to check; an insurer’s wording cannot change a standard’s scope. Insurance conditions differ, so you must read the terms for that particular entrance. An “insurance-approved” description is informal shorthand, rather than certification.
This guide helps establish which specification may fit, explains TS 007 stars and points to the markings worth recording. The table routes the enquiry; it cannot settle insurance, building-management or fire-safety obligations.
| Door | Lock fitted | Scheme and coverage | Marking to identify | Possible location |
|---|---|---|---|---|
| Timber entrance | Mortice lock | BS 3621 family: qualifying complete single-point assembly | Complete standard reference and certification details | Edge faceplate, case or product papers |
| Timber entrance | Nightlatch or rim lock | BS 3621 family: qualifying complete surface-mounted single-point assembly | Assembly’s standard and certification identification | Internal body, faceplate or supplied documentation |
| Cylinder-operated door, including uPVC or composite | Replaceable euro, oval or threaded cylinder | TS 007: cylinder and separately assessed protection | Component’s TS 007 identification and rating | Cylinder, security handle, escutcheon or product records |
| Entrance providing keyless departure | Key outside; handle or thumbturn inside | BS 8621 may cover the complete assembly | Assembly reference and certification information | Lock itself and supporting documents |
| Door with selectable secure operation | Normally keyless inside; separate secure mode | BS 10621 may cover a specialist dual-mode assembly | Exact model’s standard and certification particulars | Product marking, operating instructions and certification records |
BS 3621 concerns an entire qualifying single-point lock with keys operating both sides. TS 007 assesses replaceable cylinders and their protection, including security handles, so these schemes address different hardware. On the common euro-cylinder multipoint arrangement in uPVC or composite doors, TS 007 may cover the cylinder and protective handle; it does not assess the whole locking strip. Timber does not establish BS 3621 certification either: a mortice lock, nightlatch or cylinder system needs its own product evidence. The three BS references distinguish operating arrangements, rather than ascending security grades. A BS 3621 quotation for a uPVC multipoint door therefore needs clarification about which hardware is actually proposed.
BS 3621 Is for Lock Assemblies, TS 007 Is for Cylinders
BS 3621 certifies a whole lock assembly; TS 007 certifies a cylinder and the hardware that protects it. BS 3621 and TS 007 assess different types of lock hardware, so neither is better than the other: they answer different security questions. The practical consequence is easy to miss. A euro cylinder sold on its own cannot be a BS 3621 lock, and a lever mortice deadlock has no cylinder for a TS 007 star rating to attach to, so a listing that mentions both standards is describing two components rather than one product rated twice. Identify the relevant standards for each component, distinguishing the lock assembly from the cylinder or protective hardware.
What BS 3621 Covers and What It Does Not
The current standard is BS 3621:2017+A1:2024. It covers mechanically operated, thief-resistant single-point lock assemblies in which a key is used on either side for both locking and unlocking. BS 3621 applies to a qualifying complete lock assembly. The components that can form that assembly vary by product and include the lock case, bolt, striking plate, fixings, protective furniture and, where included in the tested design, a cylinder. This means BS 3621 relates to the complete assembly.
In homes, BS 3621 is commonly associated with qualifying mortice locks and nightlatches fitted to timber entrance doors. The lock type proves nothing by itself, though. A mortice lock simply sits in a pocket cut into the door edge, and a nightlatch is generally mounted on the inside face. Either type may exist without carrying BS 3621 certification. What settles it:
- The complete BS 3621 reference
- A recognised certification marking
- The manufacturer and product model
- Confirmation that the marking applies to the complete assembly
BS 3621 specifically concerns locks that require a removable key from inside, and it leaves out assemblies built for keyless exit. Those arrangements are addressed separately under BS 8621. A lock with an additional secure mode falls under BS 10621 instead. Do not replace a thumbturn with an internal key cylinder only because an insurance document mentions a British Standard lock.
“Five lever” is a description of the mechanism: the key has to lift five levers to the right height before the bolt will move. Although this may distinguish it from a basic three-lever lock, the number of levers is only one of many design features. It does not prove that the complete lock assembly meets BS 3621. BS 3621 covers the tested performance of the complete assembly, which is why the five-lever wording, the key shape, the bolt length, a familiar maker’s name and the look of the faceplate are all unreliable guides, and why two five-lever locks can differ in construction and certification. If BS 3621 matters for a policy or specification, check the exact model rather than the lever count alone.
TS 007: What It Covers and Who Owns It
TS 007 covers replaceable lock cylinders and the hardware used to protect them. In other words, TS 007 applies to replaceable cylinders and the hardware designed to protect them, whether euro-profile, oval or threaded and used with a compatible rim or mortice system. The protective side includes security handles, protective escutcheons, cylinder guards, lock surrounds and other cylinder-specific hardware. The Door and Hardware Federation’s TS 007 guidance explains the cylinder and protective-hardware routes used within the star-rating system.
On a typical uPVC or composite door the euro cylinder takes the key and turns the gearbox, which drives hooks, rollers or bolts along the multipoint strip into keeps in the frame. A TS 007 rating on the cylinder does not certify all those parts; it belongs only to the component carrying it. That matters when something goes wrong: a new cylinder can be the right answer for one that is damaged, unsuitable or due an upgrade, but it will not fix a worn gearbox, a failed strip or a door that has dropped out of line.
The short version, matching each standard to the part it actually assesses:
- BS 3621: check the qualifying complete lock assembly.
- TS 007: check the cylinder and any separately rated protective hardware.
| Comparison | BS 3621 | TS 007 |
|---|---|---|
| What it assesses | A complete single-point lock assembly | Replaceable cylinders and associated protective hardware |
| Common hardware | Mortice and rim-lock assemblies | Euro, oval and threaded cylinders, security handles and cylinder protection |
| How it is identified | Full BS number and certification marking | TS 007 marking, star rating and certification details |
| What it does not cover on its own | A separate cylinder outside the qualifying assembly | The complete multipoint mechanism, door or frame |
| What the reader must check | The complete lock assembly and how it operates | Which component carries each star rating |
The Three British Standards, Each Named by How You Get Out
Exit operation separates these thief-resistant single-point lock standards, rather than increasing strength:
BS 10621 and the Secure Mode
BS 10621 describes a specialist dual-mode assembly, not an upgraded BS 8621 lock. Its dwelling scope assumes an alternative escape route. Suitability depends on the building, use and escape arrangements, so professional specification is needed. It should never become a blanket recommendation for homes, shops or offices. Begin by recording the existing inside release and obtaining advice before changing it.
Keep Cylinder Stars Separate
TS 007 stars rate assessed cylinders and protective hardware. The rating does not automatically cover the door, frame, multipoint mechanism or installation. Stars should accompany the relevant Kitemark; advertising and “anti-snap” wording cannot establish certification.
Door and Hardware Federation guidance recognises these routes:
- A three-star cylinder bearing the TS 007 Kitemark, without reliance on a separately rated handle.
- A one-star TS 007 Kitemarked cylinder paired with a two-star TS 007 Kitemarked armoured handle or lock surround.
Both fitted products in the combined route must carry their stated ratings and form a recognised, compatible, correctly installed combination. A lone one-star cylinder or two-star handle over an unrated cylinder is insufficient. Check the actual markings; the cylinder’s profile, length and compatibility must also suit the lock.
- BS 3621 uses keys internally and externally.
- BS 8621 pairs an exterior key with an interior handle or thumbturn.
- BS 10621 normally permits keyless exit, but a separate action selects a secure setting that prevents departure through the lock.
Insurance Approved: What It Actually Means
There is no universal insurance approval for a lock. The phrase is trade shorthand for certification to a standard mentioned in insurance wording. BSI’s certification role is separate from an insurer’s policy decisions. Some policies specify BS 3621 for certain external doors; conditions differ by door type, insurer and policy.
Who Certifies Which Products
Technical standards describe tests, certification concerns an identified assessed product, and a policy condition describes the insurer’s expectations. Product evidence can include a standard number, Kitemark and TS 007 star rating. It does not guarantee that an insurer will accept every certified lock on every entrance.
For example, a mortice lock may be BS 3621-certified as a complete qualifying single-point assembly. A five-lever description proves no such status. TS 007 generally concerns replaceable cylinders and separately rated protection; it does not certify the whole multipoint system or entrance. BS 3621 is not normally the relevant scheme for uPVC cylinder-operated multipoint locks. PAS 24 assesses enhanced doorset security. BS 8621 covers a keyless-exit arrangement, not automatically every flat door.
Checking Your Own Policy
Write down the entire standard reference, rather than only “British Standard”, because the numbers distinguish internal operation. Check faceplate, case, packaging and product papers for BS 3621 details. TS 007 markings may sit on the cylinder or protective fittings. Record which component carries the Kitemark, reference and correct stars, with photographs and model details.
TS 007 three-star protection has two routes: a Kitemarked three-star cylinder, or a Kitemarked one-star cylinder paired with Kitemarked two-star protective hardware. An “anti-snap” name does not verify either. An unseen Kitemark is not proof of an unsuitable lock; supporting documentation may resolve it.
Check complete policy terms, door coverage and endorsements. Obtain the insurer’s interpretation in writing. A locksmith can identify the lock, while escape and managed-building arrangements need checking before internal operation changes.
Reaching Three Stars Without Buying a Three-Star Cylinder
Three stars under TS 007 can come from a lone TS 007 Kitemarked three-star cylinder, or from a TS 007 Kitemarked one-star cylinder fitted together with a TS 007 two-star Kitemarked armoured handle or lock surround.
| What is fitted | Cylinder | Handle or surround | Outcome under TS 007 |
|---|---|---|---|
| Option A | Three stars, Kitemarked | No separate rating needed | Three stars met by the cylinder |
| Option B | One star, Kitemarked | Two stars, Kitemarked | Three stars met by the combination |
| Falls short | Unrated | Two stars, Kitemarked | No recognised combination |
| Falls short | One star, Kitemarked | Unrated | One-star cylinder only |
The thinking behind option B is straightforward. A lock cylinder can be attacked directly, but also through the handle and escutcheon that sit over it, so a properly hardened surround does the same job that a three-star cylinder does alone. That is why the TS 007 guidance from the Door and Hardware Federation treats the combination as a route in its own right.
Before you count the combination, confirm:
- Both parts carry the Kitemark for TS 007, with their stars shown next to it.
- The ratings belong to the exact cylinder and handle on your door.
- The cylinder length and profile are right for the lock.
When a quote arrives, the useful question is a short one: which route is this, and are both parts Kitemarked?
How to Check What You Already Have
Start the check where a mortice lock meets the open door edge, then follow the markings to the relevant component.
Read the complete assembly reference.
Inspect the mortice faceplate or forend, or the inside body of a nightlatch. Record the certification mark, full number, manufacturer and model. BS 3621 concerns qualifying complete lock assemblies; lever count alone cannot identify certification.
Look beyond the edge on cylinder doors.
For uPVC or composite systems, inspect the visible cylinder face or end for TS 007 stars and Kitemark evidence. TS 007 assesses cylinders and protective fittings, so check the handle or escutcheon separately and record which component carries each rating.
Describe the door and its inside release.
Note material and internal, external or flat-entrance use, plus key, handle, thumbturn or selectable secure operation. BS 8621 and BS 10621 cover differing inside-opening arrangements. Confirm building and escape provisions with the responsible person before changing those arrangements.
Make a useful record.
Photograph the cylinder, faceplate, handles and whole door before contacting a qualified locksmith. Supply full insurance wording and readable product details. Identification or compatibility may still need measurements or inspection. The insurer must confirm policy acceptance, preferably through written clarification where wording is unclear.
Note: A mark that cannot be seen does not establish a failed test. Check documentation and keep certification unconfirmed until evidence is found. Do not dismantle the lock for identification. Brand, stars or informal insurance claims cannot prove whole-door compliance, and a locksmith can explain repair or replacement options.
Talk to Us About What Your Door Takes
We can check what is on your door, explain what it is and what alternatives exist, and confirm the price before we begin.
Three things make that quicker: the door material, one photo showing the faceplate or cylinder, and the policy’s own wording for any standard it names.
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British Standard Lock Questions
Does a five-lever lock automatically meet BS 3621?
No, a five-lever description does not demonstrate BS 3621 compliance. Check the individual model if a policy or specification names that standard. Its complete assembly must satisfy the relevant performance tests and carry markings that can be verified. The five internal levers must reach the right positions under the key before the bolt can move. Their number is only a design detail: five-lever locks can differ in construction and certification. BS 3621 cannot be established from the key shape, bolt length, faceplate or manufacturer's name.
Does BS 3621 apply to locks on uPVC doors?
Usually, no. The cylinder-operated multipoint arrangements typically fitted to uPVC doors are generally outside the application of BS 3621. TS 007 may concern the replaceable cylinder and its protective hardware. That component certification does not establish certification of either the complete door or the multipoint locking mechanism.
Is a three-star cylinder the only way to achieve the TS 007 three-star security level?
There are two recognised routes, so the answer is no. A TS 007 combination can use protective hardware carrying two stars alongside a cylinder carrying one star; each must bear the TS 007 Kitemark. The alternative is a three-star cylinder certified with that Kitemark under TS 007.
Is an anti-snap lock the same as a TS 007 three-star cylinder?
No, anti-snap wording is insufficient evidence of certification. A cylinder's three-star status under TS 007 needs checking through the Kitemark and its star count. The product's name does not establish that rating, and relying only on packaging language leaves the same question unanswered.
What does it mean if my lock has no visible Kitemark?
No firm conclusion about suitability follows from an invisible Kitemark. That observation does not prove a security-test failure. The product's other markings, packaging or documentation may supply the missing information. Clear photographs plus its reference can help establish its identity without taking the lock apart. Appearance, manufacturer name, key shape and lever count cannot establish certification, nor can general sales wording or unverified insurance-approval claims. If the standard and mark remain uncertain, identify its status as unidentified rather than certified.
Will changing the cylinder make my entire door compliant?
Changing the cylinder alone is insufficient to establish whole-door compliance. Only that component is replaced. No certification follows for the multipoint mechanism or handles, nor for the installation, frame or door itself. Where a security, insurance or building requirement applies, the entrance may need assessment in its entirety.
Is PAS 24 the same as BS 3621 or TS 007?
They are different specifications, so the answer is no. The enhanced security assessment of an entire doorset comes under PAS 24. For qualifying single-point locking assemblies, the relevant scope is BS 3621. TS 007 instead concerns replaceable cylinders together with the protective hardware associated with them.
Does a British Standard lock automatically satisfy my home insurance policy?
No, a British Standard designation is insufficient to settle insurance compliance. It does not establish that every policy's conditions are met. Check the full wording for the relevant entrance, as requirements differ between policies and insurers. Where the necessary standard is unclear, ask for confirmation in writing.
Does every flat entrance door need a BS 8621 lock?
No. A flat entrance does not automatically require a lock meeting BS 8621. That specification covers qualifying assemblies using single-point locking and allowing keyless exit from indoors. Assess the doorset and the applicable building, property-management and fire requirements when establishing the appropriate locking arrangement.
Where can I find the BS 3621 or TS 007 marking?
Start with the lock itself, then check its packaging and documents. Depending on the manufacturer and product, BS 3621 information may sit on the faceplate or case, while TS 007 markings can be on protective hardware or the cylinder. Confirm the standard number and certification mark as well as any star rating.