The National Building and Surveying Alliance (NBSA) was formed on the 26 November 1999. The combined membership of the NBSA member Institutes is now almost 30,000.

The NBSA is a cooperative formed for the primary purpose of providing the members of each Institute with the best possible service and benefits. Additionally, the NBSA provides a vehicle for joint activities and mutual cooperation between Institutes.

The NBSA is not a lobby group. Areas of cooperation beyond member services include education, professional development and member publications.