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Mid Loft Extension Building Regulations Less . Nevertheless the loft conversion building regulations insist that your loft, including new internal walls, must be fully insulated. 47 x 170mm joists installed will need span up to. Loft Conversion Building Regulations Drawings and Rear Extension from www.tlcplanninganddesign.com Where there is currently no insulation in the roof space, you will need to provide thermal. This section provides guidance for making alterations to the loft space of an existing house which. No higher than 1.1m above the floor level.