Permitted Development Extensions in Colnbrook

We provide clear, professional guidance on permitted development extensions in Colnbrook 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 Colnbrook

• Eaves height exceeding 3 metres near boundary
• Extension covering more than 50% of garden area
• Incorrect measurement from original dwelling
• Extension within a conservation area in Colnbrook
• Roof alteration exceeding permitted cubic volume
• Article 4 Direction restrictions

Property Types We Advise On in Colnbrook

• Semi-detached houses
• Edge-of-settlement homes
• Properties with outbuildings
• 1930s suburban homes
• Corner plot homes

Frequently Asked Questions

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

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

How is the original house defined for measurement purposes?

The “original house” refers to the property as it stood on 1 July 1948 or when it was first built, not including later extensions.

What happens if I build without permission?

The council may take enforcement action requiring alterations or removal of unauthorised works.

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 build right up to my boundary?

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

Can I add bi-fold doors to my extension?

Yes, provided the extension itself complies with permitted development rules and glazing requirements meet building regulations standards.

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