A designated area is situated within a World Heritage Site, Conservation Area, Site of Special Scientific Interest, National Park, or an Area of Outstanding Natural Beauty, the area is protected by law due to its architectural or historic interest or landscape.

Due to this protection, there will be further limits on what you can do to your property if it is within such an area, for example building an extension, changes to the roof, or work to trees. Restrictions will be put in place and permitted development rights will not apply.

If you live in a designated area, you must seek advice from your local planning authority before starting any work.

Planning permission is not normally required to turn two properties into one by knocking through a party wall provided the changes are internal and do not impact the external appearance of the property.

You should check with your local planning authority that they agree, and there are not any previous planning changes or conditions which may have an impact.

Additional permissions may be required depending on the building’s history and their location. If the building is listed, an application for listed building consent will be required before any major changes are made to the dwellings.

The work will have to comply with building regulations, the focus will be on structural work and safety.

‍Read more about how building regulations apply to internal walls.

Creating a new basement will usually require planning permission, particularly if it affects the external appearance of the property. For example, installing a lightwell to bring natural light into the basement may be subject to stricter design rules if it is visible from the street, especially at the front of the property, compared to those at the rear or side.

Because basement construction involves significant excavation and structural work, permission is often necessary. It’s recommended that you consult your local planning authority early on to understand what is likely to be considered acceptable before submitting a planning application. Building regulations will also apply to a new or conversion of a basement.

Read further guidance on basements.

There are different planning fees for England and Wales, and many different application types depending on the work being carried out.

You can use the Planning Portal's fee calculator to work out fees for different kinds of proposal.

Use the fee calculator (England)

Use the fee calculator (Wales)

While every effort has been taken to ensure that the fee has been calculated correctly, the determination of whether a planning fee is correct is the responsibility of the relevant local planning authority, who will check the fee is correct when the application is submitted and validated.

If the garage will remain in domestic use - for example, as a personal hobby or home workshop - then planning permission is typically not required.  

However, it’s important to check whether there are any planning conditions, covenants, or restrictions attached to your property or the garage itself that may limit or prevent conversion.  

Read about planning permission for garage conversions on Planning Portal.  

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