House extensiondesign in Bristol

A rear extension is usually about the kitchen, and the kitchen is usually about how a family spends its evenings. Before we draw, we look at how you move through the ground floor, where the sun falls at breakfast and supper, and which rooms go unused. Often the best move is not the biggest one. Removing one wall, lowering a floor or turning a stair can do more than another ten square metres.

In Bristol we work on Victorian and Edwardian terraces in Bishopston, Totterdown and Southville, larger villas in Clifton, Cotham and Redland, and post-war houses on the city edge. Each type has its own logic. A narrow terrace needs light from above. A villa needs an extension that does not compete with the original rear elevation. A 1950s semi often benefits most from opening up rather than building out.

Many single-storey rear extensions can be built under permitted development. For a detached house the limit is usually 4 metres in depth, and 3 metres for other houses, with a maximum height of 4 metres. The prior approval route can extend this to 8 and 6 metres. Side extensions, two-storey extensions and anything in a conservation area are more restricted.

Much of inner Bristol sits within conservation areas, and some streets carry Article 4 directions that remove permitted development rights altogether. Flats and maisonettes have no permitted development rights for extensions. We check the planning history, constraints and any directions before you commit to a design, and we confirm the route in writing. Where permitted development applies, we recommend a Lawful Development Certificate so the position is formally recorded for a future sale.

Almost every terrace or semi-detached extension in Bristol involves the Party Wall etc. Act 1996. Notices must be served on neighbours, usually two months before work on a party wall begins and one month before excavation near their foundations. We coordinate this early so it never holds up the programme.

Every extension needs building regulations approval, whether or not it needs planning permission. That covers structure, foundations, insulation, ventilation, drainage and fire safety. We prepare a full plans package, coordinated with a structural engineer, so your builder prices against a complete set of information and there are fewer surprises on site.

We favour materials that improve with time: brick and glazed brick, lime render, oak, bronze and zinc. Extensions to Bath stone or Pennant stone houses are designed to sit quietly beside the original. Glazing is placed for light and view, not for effect, and we take care over overheating, which is now assessed under Part O of the building regulations for new dwellings and is good practice for large glazed extensions too.