 It was a significant landmark in the design and construction of low-energy housing, and in the development of energy efficiency evaluation tools.It has had a long-term impact on Government policy and within the national house-building industry, insofar as the progressive 'tightening up' of the energy section of the Building Regulations has largely been founded on this pioneering work.The houses were designed to be at least 30% more efficient than the Building Regulations then in force.