Permitted Development Extensions in Olney

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

• Overall height above permitted maximum
• Two-storey extension too close to rear boundary
• Extension covering more than 50% of garden area
• Extension on a flat or maisonette
• Roof alteration exceeding permitted cubic volume
• Dormer facing road

Property Types We Advise On in Olney

• Homes subject to Article 4 Directions
• Chalet-style houses
• Properties with previous extensions
• Properties within conservation areas
• Townhouses

Frequently Asked Questions

Do I need planning permission for a loft conversion?

Many loft conversions are permitted development, but dormer size, roof alterations, and conservation area status may affect eligibility.

Is there a limit on total site coverage?

Yes. Extensions and outbuildings combined must not cover more than 50% of the curtilage of the original house.

Do I need prior approval for a larger extension?

In some cases, larger home extensions require a prior approval process where neighbours are notified and the council assesses certain impacts.

Can I extend a listed building?

Listed buildings require listed building consent, even for minor works. Permitted development rights typically do not apply.

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 is the difference between planning permission and building regulations?

Planning permission controls development impact, while building regulations ensure structural safety and compliance.

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