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certificate of lawfulness extension

Lawful development certificate for extensions: your guide

Discover how a lawful development certificate for extensions can protect your project and help ensure compliance with planning regulations.

The Extension Works 18 August 2026
Lawful development certificate for extensions: your guide
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The Extension Works — making home extensions simple

Making home extensions simple.

Single-storey rear extensions, designed and built in-house at a fixed price. All prices shown include VAT at 20%.

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