You might not need planning permission if your extension meets the criteria for Permitted Development (PD). Most single-storey rear extensions, for example, are allowed under PD if they are under 3m deep (or 4m for detached houses), don't cover more than 50% of the garden, and use similar materials.

However, you will need planning permission if:

- The extension is more than one storey

- You live in a conservation area or listed building

- Your extension exceeds PD limits or alters the front of your property

Still unsure? Get in touch.

It depends on your project. If you’re planning a home extension, loft conversion, or internal alterations, it’s often best to start with an architect to develop your layout and visual design. Once that’s done, a structural engineer steps in to make sure your plans are safe, buildable, and compliant with Building Regulations.

For smaller projects—like removing a wall, chimney breast, or garage conversion—you may not need an architect at all. A structural engineer can often provide everything you need for building control and construction.

Permitted Development Rights allow homeowners to make certain changes to their property without applying for full planning permission. Common PD projects include:

Single-storey rear extensions

Loft conversions with dormers

Internal alterations (like removing walls)

Garage conversions

Even under PD, you still need to meet Building Regulations, which require structural drawings and calculations. Need help with planning or building control? Contact us.

Usually not. Many loft conversions fall under Permitted Development, especially if:

You’re not extending beyond 40m³ (terraced) or 50m³ (detached/semi)

The extension is at the rear

You’re not raising the existing roof height

If you plan a mansard conversion, change the roof line significantly, remove a chimney stack, or live in a conservation area, planning permission may be required. Check with us now.

In most cases, no—a garage conversion that stays within the existing walls and doesn't involve major structural change can usually proceed under Permitted Development. You will, however, need Building Regulations approval, particularly for structure, insulation, and fire safety.

Planning permission: relates to how your project affects your neighbours and the appearance of the area

Building Regulations: ensure the work is structurally safe and meets national standards

Many homeowners don’t need planning permission—but almost all structural work needs building control approval.