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All necessary preparations to the building, insulation remedial fitting temporary sealing to plant, doors etc.. Improving the existing Elemental Method and Target U-value methods of showing compliance. The new versions take account of heating system performance and hence allow more design flexibility. One set of U-value standards in the draft Approved Document would apply for gas fired central heating with a boiler having a reasonable seasonal efficiency (75%). Another set of better U-values would have to be adopted if the proposed heating system has a worse performance or is to be fired by a fuel having a greater carbon burden (such as oil or mains electricity). It is proposed that the Target U-value Method should include both a simple option and one allowing consideration of all the main variables. Introducing a Carbon Index as one (optional) way of showing compliance. This would replace the SAP[1] Energy Rating Method offered in the current Approved Document L. It offers the most design flexibility in return for the attendant calculation work, and it would enable builders to show compliance by achieving a certain minimum on a scale of annual carbon emissions. It would be unaffected by fuel prices. (The SAP Rating, giving prospective purchasers or tenants an indication of an average householder's annual heating insulation and hot water services costs, will still have to be calculated and notified to Building Control Bodies as a separate administrative requirement, but, as at present, there would be no minimum SAP Rating to be achieved.) Introducing requirements for properly setting up and adjusting heating and hot water systems and their controls. No significant changes are proposed airtightness regarding the provision of controls, but installers would be expected to certify that the systems they have installed have been set up and adjusted to achieve their potential for energy efficiency.