There are three planning options, depending on the building you choose and where it will be sited. We've outlined these below, but more information can be found online on the government's Planning Portal or by contacting your local planning authority (LPA).
Small garden rooms or 'outbuildings' (no living accommodation) can be sited to the rear/side of a main dwelling under permitted development. Outbuildings must not exceed 50% of the total area of land around the original house. The maximum eaves height is 2.5m, and overall height of 4m with a dual pitched roof, or 3m in any other case. Within 2m of the property boundary the overall height must not exceed 2.5m.
Buildings with two or more storeys, a building sited on its own plot of land or a building containing living accommodation with external dimensions outside of 20 x 6.8m sited in the grounds of a main dwelling will require planning permission. All planning applications are required to be submitted on a standard form, either online via the Planning Portal or by post. A decision is usually made within 8 weeks.
PLANNING FREE MOBILE HOME
Single-storey buildings containing living accommodation with external dimensions no greater than 20 x 6.8m can be sited in the grounds of a main dwelling without needing full planning permission. These buildings are deemed as a mobile home/granny annexe under a Lawful Development Certificate. Take a look at our planning free guide for more info, or view the models in our Planning free mobile home range.
All planning related information provided is based on English law and intended as a guide only. IFORM BUILDINGS shall not be held liable or responsible to any person or entity for any loss from acting or refraining from action as a result of the information provided.