Do I Need Planning Permission for a Conservatory?

Most conservatories in England do not need planning permission. A conservatory is treated as a rear or side extension under permitted development rights, as long as it stays within standard size, height and design limits — and does not cover more than half your curtilage. Deeper conservatories may need prior approval rather than counting as standard permitted development.

• Single storey and within standard rear extension depth limits measured from the original rear wall (3m semi/terraced, 4m detached)
• Maximum height no more than 4 metres, with eaves no more than 3 metres if within 2 metres of a boundary
• Does not extend beyond the side wall of the original house facing a highway
• Materials are similar in appearance to the existing dwelling
• No veranda, balcony or raised platform over 0.3 metres
• Less than half the curtilage is covered by buildings and additions
• Property is a house (not a flat or maisonette) with permitted development rights intact

Conservatories deeper than the standard 3 metre / 4 metre limits — up to 6 metres (semi/terrace) or 8 metres (detached) — are not standard permitted development. They require prior approval under the Larger Home Extension neighbour consultation scheme (notify the council, 21-day neighbour consultation, fee around £103). That scheme does not apply on designated land such as conservation areas, National Parks, AONBs or World Heritage Sites — there, anything beyond the standard depths needs full planning permission.

• Conservatory exceeds standard size or height limits and either exceeds the prior-approval depths or sits on designated land where that route is unavailable
• Property is a listed building (listed building consent is also required)
• Permitted development rights removed by an Article 4 direction
• Original planning permission conditions restrict extensions
• Conservatory is forward of the principal elevation facing a highway

In conservation areas, side extensions are not permitted development, and the Larger Home Extension prior-approval route is not available. Rear conservatories within the standard 3m / 4m depths may still qualify, but stricter design and materials rules often apply.

Planning permission and building regulations are separate. A conservatory may be exempt from building regulations if it is separated from the house by external-quality doors, is under 30 square metres, and has an independent heating system — but many homeowners still choose to comply for safety and energy efficiency.

Planning rules change and can vary by location. Conservatory size, property type, boundaries and previous extensions all affect whether you need permission. Confirm with your local planning authority, or use our free checker for a tailored answer in under 60 seconds.