Basements

Can I convert or add a basement to my home?

You can find out more about converting an existing basement or adding a new basement to your property by visiting our project advice page. This section provides advice such as;

Inspiration
Lighting
Waterproofing
Value for money
Conversion timescale
Financing.

Visit project advice for basement conversions¹

Find a Trade Professional

Use our partner directories to find a planning or building professional to help with your project or development.

Find a professional ^{(https://www.planningportal.co.uk/planning/planning-applications/find-a-trade-professional)}

Find a professional

Useful links

Make an application ^{(https://www.planningportal.co.uk/app/applications)}

Make an application

Speak to an expert ^{(https://www.planningportal.co.uk/permission/planning-guidance-service)}

Speak to an expert

Studio Charrette consultancy calculator ^{(https://www.planningportal.co.uk/permission/home-improvement/planning-consultancy-calculator)}

Studio Charrette consultancy calculator

Sell your site with Land Match ^{(https://www.planningportal.co.uk/permission/commercial-developments/sell-your-site)}

Sell your site with Land Match

https://www.planningportal.co.uk/permission/home-improvement/project-advice/project-advice-basement-conversion

The Planning Portal is delivered by PortalPlanQuest Limited which is a joint venture between TerraQuest Solutions Limited and the Ministry of Housing, Communities & Local Government (MHCLG). All content © 2025 Planning Portal.