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Thank you for the thoughts Tony, appreciated. Apparently the BCO asked the architect to add sufficient returns, otherwise to explore the need for windposts in the design. My understanding from Approved Document A is that if you don't have a buttressing wall/chimney/pier and/or sufficient...

Hi All, I'm helping a friend to build a single story 6x3.45x2.6m (LxWxH) extension to their house. The cavity wall consists off bricks, cavity and blocks, 100mm each. The architect wanted windpost design for the extension, now I'm not sure whether it's required by the Building Control Officer...