BBA certificates for roofing systems: how to read and check one
Updated 23 October 2026 · SEO Dons Editorial
Check your re-roof against the rules ↓
"BBA approved" and "certified system" on a proposal tell you very little. What you need is a certificate number for the exact system, in force, whose scope matches your deck, insulation and use. This guide shows what a certificate covers, how to read it and how to check it.
What does a BBA certificate cover for a roofing system?
The BBA describes its Agrément Certificates as bringing together a product's technical data, performance characteristics, intended use, limitations and installation considerations in one document. It says the certificate also includes a service life statement that assesses durability under the specific conditions of use.
A certificate is specific. The BBA says it relates to a specific product and a specific organisation, certifying that product against a set of criteria for a particular use. So the number must be for the system actually proposed, not a different membrane from the same manufacturer, and the certificate holder should be the manufacturer or an organisation that holds its own certificate for that product.
What does a certificate not cover?
- Departures from the certificate. The BBA says its certificates prove a product is fit for purpose and complies with UK Building Regulations on the condition that it is installed and maintained exactly as detailed in the certificate. A different insulation, adhesive, fixing or detail takes the roof outside what was assessed.
- The contractor. Installer approval is separate. The BBA's Approved Installer Scheme audits an installer's premises and inspects a sample of its installations, and the BBA says each certification defines whether BBA-approved installers are required to install or maintain the product.
- Your roof's design. A certificate supplies data about the system; the design still has to be done. Falls, drainage, the fixing pattern for the wind exposure and the Part L target are for the specification.
- Out-of-date references. The BBA warns that Regulations quoted in a certificate may not be valid until it is updated, although the performance characteristics are unaffected, so the stated parameters must be checked against current requirements.
How do you read a certificate?
The BBA advises reading the content of a certificate in full to confirm the parameters of use. These are the parts that matter on a flat roof:
| Look for | Why it matters |
|---|---|
| Certificate number, holder and date | The number goes into the proposal; the holder should be the manufacturer or a named reproduction certificate holder. |
| Scope and intended use | Deck type, insulation, build-up and use (foot traffic, plant, green roof) must match your roof. |
| Performance data, including fire performance | A roof near a boundary needs the right external fire classification; see the BROOF(t4) guide. |
| Durability statement | The assessed service life under stated conditions. It is not a guarantee. |
| Installation and maintenance | Conditions the installer and owner must follow, and whether approved installers are required. |
| Regulations references | May lag current rules; the designer should confirm the parameters meet them. |
How do you check that a certificate is current?
The BBA says an Agrément Certificate has no defined expiry date: continued validity depends on maintenance, which includes six-monthly factory surveillance visits and three-yearly reviews. A suspended certificate is removed from the BBA website and its holder cannot claim the product is BBA certified; a withdrawn certificate is removed and is no longer searchable. A brochure copy therefore proves little. The BBA's MyBBA search lets users find and verify certified products, systems and installers and view the status of withdrawn, suspended and recently added certificates.
What is the position with the BBA's accreditation?
Position at 22 October 2026, which may change. The BBA's website carries a notice headed "Temporary suspension of UKAS accreditation", saying its accreditations are currently suspended and that it is working with UKAS to resolve the matter. NFRC reports that UKAS suspended all scopes of the BBA's accreditation on 26 February 2026 and that a suspension may last until 25 November 2026 at the latest. In its own statement, quoted by NFRC, the BBA says UKAS has raised no concerns about its technical competence and that its corporate re-structure is the focus of the suspension.
NFRC adds that the BBA has assured it that published certificates remain valid according to their status, which can be verified on MyBBA, and that the BBA is unable to issue new certificates at this time. For a buyer, that means a certificate already published should still be checkable, while a brand-new system may not yet have one. Ask the manufacturer to confirm in writing the current status of the certificate for the named system, and check the BBA's and NFRC's latest notices before relying on this paragraph.
How do you check a certificate before you sign?
- Ask for the system name, the manufacturer and the BBA certificate number for the whole build-up, not only the membrane.
- Search the number on MyBBA and note the status.
- Confirm the holder is the manufacturer, or a named reproduction certificate holder for that product.
- Read the scope, performance data, fire performance and installation conditions against your deck, insulation and use.
- If approved installers are required, ask the manufacturer for its register of them; the BBA says its own Installer Search is being updated.
- Match every layer in the proposal to the certificate. Agree any substitution in writing with the manufacturer.
- Have the certificate number written into the specification and contract, and keep a copy in the handover file.
Why must a proposal name the certificate number?
A number fixes which assessment applies, lets you check its status now and later, and gives a test for any substitute system someone proposes mid-contract. It also separates the system from the people laying it, which is why checking the contractor is a separate exercise, as the SSIP, CHAS and Constructionline guide and the accreditations page explain. If you want to talk through a proposal, you can send an enquiry through the form on this page.
Sources
- 5 facts about Agrément you may not know, British Board of Agrément (BBA) (checked 22 October 2026). Page shows: published 6 August 2026.
- How to specify construction products more confidently, BBA (checked 22 October 2026). Page shows: published 5 October 2026.
- Frequently asked questions, BBA (checked 22 October 2026).
- MyBBA certificate search, BBA (checked 22 October 2026).
- BBA Approved Installer Scheme, BBA (checked 22 October 2026).
- Choose a BBA certified product, BBA (checked 22 October 2026).
- BBA home page: temporary suspension of UKAS accreditation notice, BBA (checked 22 October 2026).
- Competent person scheme: current schemes and how schemes are authorised, GOV.UK (checked 22 October 2026). Page shows: last updated 17 September 2026.
- UKAS and BBA release statements updating industry on suspension, NFRC (checked 22 October 2026).
- BBA UKAS suspension: NFRC engagement and concerns, NFRC (checked 22 October 2026).
Common questions
Is a BBA certificate a legal requirement for a flat roof?
The BBA says Agrément certification is voluntary. Compliance with the Building Regulations is a separate matter, signed off through building control or a competent person scheme, so a certificate supports a specification rather than replacing that route.
Does a CE or UKCA mark replace a BBA certificate?
They are different documents. The BBA says a declaration of performance is self-declared by the manufacturer and is not generally substantiated by third-party testing, whereas Agrément certification tests a product for a specific application. Ask which documents exist for the named system.
Can an installer or distributor rely on the manufacturer's certificate?
The BBA says each certificate is unique to the organisation that requested it. A distributor of a white-labelled product can apply for its own reproduction certificate, but only if the original manufacturer holds an active certificate for the same product.
What if the certificate is suspended or withdrawn after the contract is signed?
The BBA says a suspended certificate is removed from its website and the holder cannot claim the product is BBA certified. Ask the contract to require notice from the contractor and manufacturer of any change in status, and ask what evidence replaces it.
Related guides
Check your re-roof against the rules
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