The UK’s best-known construction product certification body, issuing the Agrément Certificates specifiers rely on for external wall systems, insulation, membranes and roofing — documents whose fire section is often the first evidence a designer reaches for. The BBA is a UKAS-accredited certification body (0113), testing laboratory (0357) and inspection body (4345), and a UK Approved Body for UKCA marking, with its own laboratories on the Watford campus.