Building Regulations Part L: Approved Document L1B (2013 edition, effective 6 April 2014) requires a 25% improvement over 2006 standards for every new home.  Meer

This guide is referred to in the 2013 edition of Approved Document L2A and the 2010 edition of Approved Document L2B (as amended in 2013) for non-domestic buildings as a source of guidance on complying with Building Regulations requirements for space heating and hot water systems, mechanical ventilation, comfort cooling, fixed internal lighting and renewable energy systems.  Meer

This guide is referred to in the 2013 edition of Approved Document L1A and the 2010 edition of Approved Document L1B (as amended in 2013) for dwellings as a source of guidance on complying with Building Regulations requirements for space heating and hot water systems, mechanical ventilation, comfort cooling, fixed internal and external lighting and renewable energy systems.  Meer

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 home.  Meer