Building Regulations Part L: Approved Document L1B (2013 edition, effective 6 April 2014) requires a 25% improvement over 2006 standards for every new home. An aggregate approach for improvement of ne
Building Regulations Part L: Approved Document L1B Conservation of fuel and power in existing dwellings (2013 edition, effective 6 April 2014) requires a 25% improvement 2006 standards for every new h
