Only architectural practices that meet strict eligibility criteria can register as a Royal Institute of British Architects (RIBA) Chartered Practice. They need to employ RIBA chartered architects, have appropriate professional indemnity insurance, have quality management and other policies in place, and most importantly conduct themselves in accordance with the RIBA code of conduct and code of practice.
Chartered practices are committed to excellence in design and customer service. That’s why the RIBA only promotes accredited Chartered Practices to clients. (see the RIBA find an architect website)