New requirements for the conservation of fuel and power came into effect in England and Wales on 1 April 2002, bringing several significant changes. Compliance with these requirements can be achieved by adopting robust construction detail designs. The development of the document "Limiting thermal bridging and air leakage: Robust construction details for dwellings and similar buildings" is outlined. Its aim is to help the construction industry meet the revised building regulations and the aims of higher standards of energy efficiency and better, more comfortable homes, as well as help manufacturers and suppliers develop their own details. Basic criteria are noted. The document considers a range of common construction details within a range of U values. Details included in the guidance are given. For masonry, the guidance is split into four types of wall construction: solid walls with external insulation; cavity walls with fully filled cavities; cavity walls with partially filled cavities; and cavity walls with internal wall insulation. For each wall type, a wide range of junction details are shown. 7 refs.