Extensions

Most extensions of properties require approval under the Building Regulations.

There are a number of classes of new buildings or extensions of existing buildings that do not need Building Regulations approval, i.e. are exempt from the Regulations. Read more about exemptions.¹

The following pages give an indication of some of the elements normally required to satisfy the requirements of the Regulations when building an extension.

The following common work sections give an indication of several other elements normally required to satisfy the requirements of the Regulations when building an extension:

• Doors and windows²
• Drainage³
• Electrics⁴
• External walls⁵
• Kitchens and Bathrooms⁶
• Internal walls⁷
• Roofs⁸

You must also find out whether the work you intend to carry out falls within The Party Wall etc. Act 1996⁹.

A planning consultant may help with the smooth running of your extension project, and guide you on your building regulation requirements. To find an accurate consultancy quote, explore Studio Charrette's calculators¹⁰. 

1. https://www.planningportal.co.uk/applications/building-control-applications/building-control/building-regulations/exemptions-from-building-regulations
2. https://www.planningportal.co.uk/permission/common-projects/doors-and-windows
3. https://www.planningportal.co.uk/permission/common-projects/drains-and-sewers
4. https://www.planningportal.co.uk/permission/common-projects/electrics
5. https://www.planningportal.co.uk/permission/common-projects/external-walls
6. https://www.planningportal.co.uk/permission/common-projects/kitchens-and-bathrooms
7. https://www.planningportal.co.uk/permission/common-projects/internal-walls
8. https://www.planningportal.co.uk/permission/common-projects/roof
9. https://www.gov.uk/guidance/party-wall-etc-act-1996-guidance
10. https://www.planningportal.co.uk/permission/home-improvement/planning-consultancy-calculator