“Building Systems” is a generic term for buildings that are manufactured from pre-designed and prefabricated components produced in series off-site. The scheme is based on the principles of ISO9001, EN 45011/12, ISO Guide 62/65 and confirms compliance with the main requirements of with ETAG 007, ETAG 012, ETAG 021, ETAG 023 and ETAG 025, whichever is most appropriate to the building(s) to be certified, together with a specific set of performance criteria set by BM TRADA in order to attain a design which performs to a high standard. The relevant guidelines listed above are to be read in conjunction with this document.