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Building Regulations 2018
235Extension of non-complying external wall
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235 Extension of non-complying external wall
Despite anything to the contrary in these Regulations, a single storey external wall (including any openings) of a Class 1 building may be extended, once, a maximum of 6 m measured horizontally in similar construction without the extension of the wall complying with performance requirement H3P1 of the BCA Volume Two.