Permitted Development Rules UK — What You Can Build Without Planning Permission

One of the most common questions homeowners ask before starting a renovation is: do I need planning permission? The answer depends on what you're building, where you live and the specifics of your property. But the good news is that many common home improvements fall under permitted development — meaning you can build them without applying for planning permission at all.

This guide explains the key permitted development rules for England in 2026. Note that rules differ in Scotland, Wales and Northern Ireland — always check with your local planning authority if you're outside England.

What is permitted development?

Permitted development (PD) rights are a set of national planning permissions granted automatically by the government, allowing certain types of work without needing to apply for planning permission. They exist to reduce the planning burden on homeowners for common, relatively minor improvements.

Permitted development rights don't apply if your property is a flat or maisonette, is listed, or is in a designated area such as a National Park, Area of Outstanding Natural Beauty or conservation area — where stricter rules apply.

Single storey rear extensions

The Larger Home Extension Scheme allows extensions up to 8 metres (detached) or 6 metres (semi/terrace) through a prior approval process — not full planning permission, but requiring notification to the council and a neighbour consultation period.

Two storey rear extensions

Loft conversions

Most loft conversions — including dormers to the rear — fall within permitted development. Hip-to-gable conversions and mansard roofs visible from the street typically require planning permission.

Outbuildings and garden offices

Side extensions

Side extensions are more restricted under permitted development. A single storey side extension is permitted if it's no wider than half the width of the original house and no higher than 4 metres. However, in many areas, permitted development rights for side extensions have been removed — check with your local authority before proceeding.

Porches

When you always need planning permission

• Any work on a listed building (also requires listed building consent)
• Work in a conservation area that would affect the character of the area
• Change of use — for example converting a house to flats
• New dwellings or separate units
• Work that exceeds the PD size limits
• Extensions to flats or maisonettes

Lawful Development Certificates

Even when work falls within permitted development, it's worth applying for a Lawful Development Certificate (LDC) from your local council. An LDC provides formal confirmation that the work is lawful — which protects you when you come to sell, as solicitors and buyers will ask for evidence that any recent work had the appropriate permissions.

An LDC costs around £100-£200 and takes 8 weeks. For any significant work, it's money well spent.

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Understanding permitted development rights can save you significant time and money on your renovation project. But the rules are complex and constantly evolving — always verify with your local planning authority before starting work, and consider obtaining a Lawful Development Certificate for any significant improvement.