- The Building Regulations 2000. Approved document L2A. Conservation of fuel and power in new buildings other than dwellings. 2010 edition. The Stationery Office. Free download available.
- BS EN ISO 13789:1999 Thermal performance of buildings – Transmission heat loss coefficient – Calculation method.
- National Calculation Methodology document – in preparation.
- IP 17/01. Assessing the effects of thermal bridging at junctions and around openings. Tim Ward. BRE East Kilbride.