The National Building Regulations and Building Standards Act (No. 103 of 1977) incorporated Energy Use in Buildings in 2011. The national standard SANS 10400XA is mandatory for all new buildings within the scope of the National Building regulations, and references the voluntary national standard, SANS 0204. In terms of compliance with SANS 10400XA, buildings can choose between the prescriptive route and the reference building or performance route. The reference building route is similar to the performance route, except that it uses the energy performance of a reference building (with strict application of the prescriptive route) as the basis of compliance. Provincial and local governments are the major authorities who take the responsibility of code implementation and enforcement, with some support from third parties.