Permitted Development Extensions in Knowl Hill

We provide clear, professional guidance on permitted development extensions in Knowl 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 Knowl Hill

• Extension within a conservation area in Knowl Hill
• Prior approval required but not obtained
• Roof alteration exceeding permitted cubic volume
• Extension covering more than 50% of garden area
• Raised decking exceeding permitted height
• Extension built beyond original rear wall line

Property Types We Advise On in Knowl Hill

• Chalet-style houses
• Properties with outbuildings
• Properties within conservation areas
• Corner plot homes
• New build developments

Frequently Asked Questions

Can I build a two-storey extension without planning permission?

Two-storey extensions are sometimes permitted, but stricter limits apply to height, rear projection distance, and window placement to avoid overlooking neighbours.

Can I extend a semi-detached house differently to a detached house?

Yes, size limits and projection distances differ depending on property type.

What is retrospective planning permission?

Retrospective applications seek approval for work already carried out.

Are there restrictions on side-facing windows?

Yes. Upper-floor side-facing windows typically must be obscure-glazed and non-opening below a certain height.

Can I add a balcony to my extension?

Balconies and raised platforms are not permitted development and usually require planning permission.

Can I build right up to my boundary?

It depends on height and location. Boundary proximity affects allowable eaves height.

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