u-value

Hi, I want a small extension to accommodate a 2x1m bathroom (internal area) and a 1.5x1m service area. I'd like an external brickwork, in terms of appearance, to blend with the rest of the house (cavity wall from 1970). What is the U-value requirement for the new external walls, please? Am I...

Hello All, I have scoured the interweb for information on designing, planning and eventually building an workshop for myself. I have been granted planning permission to build a 5m x 8m at 3.3m high outbuilding with a flat roof. Now I need to apply for building regulation which is where I am...