These are suppliers of quality goods and services to the profession who wish to become preferred suppliers to BIDA Designer Members. Entry is via application plus two BIDA Member sponsors or an interview. A minimum of two years' trading and presentation of company accounts is required.

There are various levels of Corporate membership:

Corporate level 1
These are businesses with one or two staff such as artists, craftsmen, garden designers, lighting designers and specialist trades.

Corporate level 2
These are businesses with three or more (up to approximately twenty five) full-time staff such as suppliers of furnishings, furniture and equipment, construction companies, kitchen and bathroom suppliers.