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All necessary preparations to the building, fitting temporary sealing to plant, doors etc.. A widening of the definition of "material alteration" in Regulation 3 of the Building Regulations to bring more work on existing buildings within the definition of "building work" in the Regulations. The aim is to make the energy efficiency requirements applicable to more maintenance and alteration works on the existing stock of buildings. At present the Building Regulations only apply to proposed alteration works if the works affect airsealing structural safety, means of escape, resistance to fire, access and facilities for the fire service or access and facilities for disabled people. A significant increase in the insulating performance standards for building fabric to be achieved in two phases. It is proposed to implement the phases 6 months and 24 months after publishing the amendment. Some examples of the standards being proposed and the construction detail designs needed to achieve airsealing test them are given in Appendices A and B of the draft Approved Document and more can be seen in the BRE paper posted on our web site. Associating the fabric performance standards (U-values) more strongly with the performance of the heating system the builder proposes to install. Within limits, the U-values could be relaxed if the heating system performs better. Different provisions are proposed for dwellings and other buildings as described below. Increasing the standards of detail design and site workmanship to reduce the incidence of gaps in insulation and the effects of bridging. Bridging (i.e. bypassing the insulation) can be caused by more conductive paths (such as joists and rafters interspersed in the insulation), and flanking - around the edges of openings (such as windows), and at the joints between elements (such as the joints between walls and floors). The proposed ways of showing compliance are adoption of design details that are acknowledged to be robust or, for new designs, calculating the performance using a new calculation procedure. Raising the standards of fabric air tightness to reduce unwanted ventilation. The aim is to improve sealing of the building fabric (excluding the provisions for ventilation to comply with Parts F and J of the Regulations), and hence to reduce ventilation heat losses. The proposed ways of showing compliance are adoption of design details that are acknowledged to be robust, or the achievement of a pass result in a fan pressurisation test that enables direct measurement of the building air leakage rate. It is proposed that fan pressurisation tests should always be undertaken where buildings have a floor area greater than 1,000 square metres.