Permitted Development Rights for Home Extensions: What You Can Build Without Planning Permission

Permitted development (PD) rights allow homeowners to make certain extensions without needing to apply for planning permission. Understanding these rights can save significant time and money.

Rear Extensions

Standard Permitted Development (No Application Required)

• Detached houses: up to 4m depth
• All other houses: up to 3m depth
• Maximum height: 4m
• Cannot cover more than 50% of garden
• Materials must be similar to existing house

Neighbour Consultation Scheme (Larger Extensions)

Under this scheme, you can build up to 8m (detached) or 6m (all other houses) subject to a prior approval application and 42-day neighbour consultation period.

Double Storey Rear Extensions

• Extend no more than 3m beyond the rear wall
• Within 7m of the rear boundary
• Does not exceed height of existing house
• Side windows must be obscure-glazed

Side Extensions

• Maximum width: half the original house width
• Maximum height: 4m
• Must not extend beyond the principal elevation (front of house)

Important: In conservation areas and for terraced/semi-detached houses, side extensions almost always require planning permission.

What Cannot Be Built Under Permitted Development

• Extensions in conservation areas visible from the street
• Extensions on listed buildings
• Extensions covering more than 50% of the garden
• Extensions on flats and maisonettes
• Extensions where Article 4 directions apply

Lawful Development Certificates

Even if your extension qualifies for permitted development, a Lawful Development Certificate (LDC) provides formal confirmation from the council. Essential when selling your home. Cost: £206 in England. Takes 6–8 weeks.

• Our planning permission service
• Single storey extensions
• Extensions in Battersea
• Extensions in Richmond

Frequently Asked Questions