An extension gives you the opportunity to make a space that’s easy to live in without having to negotiate steps or stairs. For example:
Include an easy access shower and toilet — or at least design a space where you can fit them later:
Allow space to move in front of the shower and toilet
Provide pipework for the water supply
Install a trap and drainpipe low enough for a floor-draining wet space or a low level shower tray
If the internal walls are built with timber, add softwood or plywood panels before plasterboarding, so that support rails can be added later.
Create a large clear space which could be used as a bedroom when necessary - at least 12 square metres (130’ square) with sides at least 3m long and wide (10’).
Have windows fitted so that the locks and latches are less than 1200mm (4’) above the floor level.
Have light switches fitted at least 900mm (3’) and no more than 1100mm (3’8”) above the floor level.
Have sockets and other controls fitted at least 400mm (1’4”) and no more than 1200mm (4’) above the floor level.
Make a level or gently sloping path to the outside door and choose a level threshold strip.
You must apply for a building warrant if you plan to build an extension. Your local council’s building standards team can advise on building regulations requirements for extensions.
