Permitted Development Extensions in Mortimer

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

• Extension on a flat or maisonette
• Side extension exceeds half the width of the original house
• Dormer facing road
• Two-storey extension too close to rear boundary
• Incorrect measurement from original dwelling
• Rear extension exceeds permitted projection limits Mortimer

Property Types We Advise On in Mortimer

• Terraced houses
• Corner plot homes
• 1930s suburban homes
• Semi-detached houses
• Townhouses

Frequently Asked Questions

What is the 45-degree rule?

The 45-degree rule is a guideline used by some councils to assess impact on neighbouring properties, particularly in relation to light and outlook.

Can I build over a sewer?

Building near or over a public sewer may require a build-over agreement from the relevant water authority.

Can I submit planning drawings myself?

Yes, but professional plans improve clarity and reduce refusal risk.

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.

How high can my extension be?

Height limits vary, but rear extensions under permitted development generally cannot exceed four metres for detached houses or three metres for others.

What is a Lawful Development Certificate?

A Lawful Development Certificate provides formal confirmation from the local authority that your extension complies with permitted development rules.

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