Permitted Development Extensions in Biggin Hill

We provide clear, professional guidance on permitted development extensions in Biggin Hill and surrounding areas. Whether you’re planning a rear, side, or two-storey extension, understanding local planning constraints and national permitted development limits is essential before work begins.

Common Permitted Development Issues in Biggin Hill

• Rear extension exceeds permitted projection limits Biggin Hill
• Dormer facing road
• Listed building restrictions
• Extension built beyond original rear wall line
• Extension covering more than 50% of garden area
• Outbuilding positioned forward of principal elevation

Property Types We Advise On in Biggin Hill

• Chalet-style houses
• Detached houses in Biggin Hill
• 1930s suburban homes
• Homes subject to Article 4 Directions
• Corner plot homes

Frequently Asked Questions

Does an Article 4 Direction affect my extension plans?

Yes. Article 4 Directions remove certain permitted development rights, meaning planning permission may be required.

Are side extensions allowed under permitted development?

Side extensions are permitted in some cases, but must not exceed half the width of the original house and must meet height limits.

Can I extend a house that has already been extended?

Permitted development limits are cumulative, so previous extensions may reduce what is still allowed.

What happens if permitted development rights have been removed?

If rights have been removed by planning condition or Article 4 Direction, you will likely need to submit a full planning application before building.

What is the maximum rear projection allowed?

Detached houses may extend up to four metres under standard rules, or eight metres with prior approval. Smaller limits apply to other house types.

Can I extend above a single-storey extension?

Possibly, but this often requires planning permission and must comply with height and design considerations.

If you're planning an extension in Biggin Hill and want to confirm whether it qualifies under permitted development rules, request a free assessment today and get clarity before you build.