Do I need planning permission for an extension?

One of the most common questions homeowners ask when considering an extension is whether planning permission is required.

The answer depends on a number of factors, and it’s not always straightforward.

Permitted development rights

In the UK, some extensions can be built under permitted development rights, which means you may not need full planning permission.

However, there are strict limits on:

• Size and height
• Distance from boundaries
• Materials used
• Impact on neighbours

If your project falls outside these limits, planning permission will be required.

When planning permission is more likely

You are more likely to need planning permission if:

• You live in a listed building
• Your property is in a conservation area
• The extension is large or significantly alters the property
• The design impacts neighbouring properties

Common misunderstandings

Many homeowners assume they don’t need permission, only to find later that they do.

Others overcomplicate things and delay projects unnecessarily.

Why it’s worth checking early

Understanding planning requirements early can help you:

• Avoid delays
• Prevent costly redesigns
• Make better design decisions

A professional consultation can quickly assess whether your project is likely to require planning permission and what your options are.

If you’re unsure how this applies to your own home, a Home Doctor consultation can help you understand your options.