Loft Conversions

For loft conversions that are likely to fall within permitted development a lawful development certificate is recommended, so that you know your project is compliant and is protected from any retrospective planning issues, enforcements or penalties. Building regulations may also be required depending on the extent of the works.

As a guide any loft conversion that meet these criteria will not need planning permission:

• The new loft space won’t be larger than 40 cubic metres for terraced houses and 50 cubic metres for detached and semi-detached houses.
• The loft conversion doesn’t extend beyond the plane of the existing roof slope at the front of the house (principle elevation).
• The loft conversion does not extend higher than the highest part of the existing roof.
• The loft conversion does not include any verandas, balconies, or raised platforms.
• The loft conversion is made using materials that are similar in appearance to the rest of the house.
• Any side-facing windows must be obscure-glazed (to stop people seeing in and out).
• Any side facing windows must be at least 1.7m above the ground.
• Your home is not located in certain designated areas, including national parks, Areas of Outstanding Natural Beauty, conservation areas, and World Heritage Sites.
• A roof extension, with the exception of hip-to-gable extensions, must be set back at least 20cm from the original eaves.
• A roof extension must not overhang the outer wall of the original house.
• Loft conversions are NOT permitted development for houses on designated land.

Bear in mind that any previous roof space additions must be included within this volume allowance. Although you may not have created additional space a previous owner may have done so.

An extension beyond the plane of the existing roof slope of the principal elevation that fronts a highway is NOT permitted development.

If there are any constraints that limit or remove permitted development rights or even one of these criteria is not met, then you are required to submit an application for planning permission.

If planning permission is required but the works are completed without first securing the proper planning approval you may face retrospective planning issues. If the local planning authority determine that planning permission was required an enforcement and or penalties may be issued. If planning permission cannot be secured retrospectively the converted loft may need to be put back to its original state.

If you are in any doubt our expert planning consultants can help. By carrying out a planning appraisal we can advise you on whether planning permission is required, the feasibility, process, timescales, likelihood of success and answer any other questions that you have. Once we know exactly what is required for your project, we will provide you an accurate quote for us to help you.