Larger rear extensions: prior approval and neighbour consultation

Scope: England Last reviewed: 2026-02-06

The quick answer

If you want a deeper single-storey rear extension than standard PD allows, you may use the larger home extension scheme. This usually needs prior approval with neighbour consultation, and you must follow the notice and timing rules tightly.

Quick checks

• Is it a house (not a flat/maisonette)?
• Are you in a conservation area or under Article 4?
• Are you measuring from the original house?
• Do you need prior approval for deeper rear extensions?
• Would an LDC reduce resale risk?

Common fail points

• Wrong baseline measurements
• Height mistakes near boundaries
• Ignoring constraints (Article 4, conservation)
• Confusing planning route with building regulations

Next steps

• If you want a clear yes/no for your exact property, book a consultation.
• If you want proof for resale, consider an LDC pack.

Primary sources

• GOV.UK: Permitted development rights for householders (technical guidance)
• GOV.UK: Lawful Development Certificates guidance
• Planning Portal: Interactive House (guidance)