Do I need planning permission to convert my loft?
Building a loft extension or converting your existing loft space is one of the most common developments in the UK. One of the reasons for this is because planning permission is not normally required. However, permission is required where you extend or alter the roof space and it exceeds specified limits and conditions.
A loft conversion for your house is considered to be permitted development, not requiring an application for planning permission, subject to the following limits and conditions:
- A volume allowance of 40 cubic metres additional roof space for terraced houses*
- A volume allowance of 50 cubic metres additional roof space for detached and semi-detached houses*
- No extension beyond the plane of the existing roof slope of the principal elevation that fronts the highway
- No extension to be higher than the highest part of the roof
- Materials to be similar in appearance to the existing house
- No verandas, balconies or raised platforms
- Side-facing windows to be obscure-glazed; any opening to be 1.7m above the floor
- Roof extensions may not be permitted development in conservation areas.
- Roof extensions, apart from hip to gable ones, to be set back, as far as practicable, at least 20cm from the original eaves
*Bear in mind that any previous roof space additions must be included within the volume allowances listed above. Although you may not have created additional space a previous owner may have done so.
Please note: the permitted development allowances described here apply to houses not flats, maisonettes or other buildings.
Many home owners want to build their loft extension, rear or side dormer - AFTER obtaining a Lawful Development Certificate from the council. This way (when the time comes) you can sell your property knowing that everything was done lawfully. 4D Planning Consultants LTD. have years of experience preparing Lawful Development (Permitted Development) Applications, and we would be happy to offer you a competitive quote for your application.
For a summary of when you would probably need planning permission click here.
For more information on the planning process, click here.