Do I Need Planning Permission for an Extension?

One of the first questions homeowners ask is whether they need planning permission. The good news is that many extensions and loft conversions in England can be built under Permitted Development rights, meaning no full planning application is required. But there are important exceptions.

What is Permitted Development?

Permitted Development (PD) allows certain building work without a planning application, provided it stays within set size and height limits. Typical examples include single-storey rear extensions within depth limits, dormer loft conversions within volume limits, and modest outbuildings. It is still wise to apply for a Lawful Development Certificate to prove your project is lawful — useful when you come to sell.

When you usually DO need planning permission

• Your property is a flat or maisonette (PD rights do not apply).
• You live in a conservation area, National Landscape (AONB) or your home is listed.
• The extension exceeds the permitted size, height or depth limits.
• You are building a mansard loft or a large two-storey extension.
• An Article 4 Direction has removed PD rights in your area.

Planning permission is not the same as Building Regulations

Even when planning permission is not required, almost all structural work must still comply with Building Regulations, which cover safety, insulation, fire escape and structural integrity. This is a separate approval and applies to virtually every loft conversion and extension.

At Luca Extension we handle the whole process for you — from drawings and applications to building control sign-off. Learn more about our house extension service or get in touch for a free feasibility check.