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Extensions

Is building regulations approval needed for an extension?

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

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 calculators2

Build Aviator's estimating service can help you plan your project by providing an accurate cost of the proposed construction. Find out more3.

Once costs have been estimated, the quick quote finance calculator4 from Selina Advance can take all of the hard work out of searching and securing the funds needed for your project.

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:

You must also find out whether work you intend to carry out falls within The Party Wall etc. Act 199612.

Find a Trade Professional

Use our partner directories from CIAT, FMB, RIBA, or RTPI to find an chartered architectural technologist, builder, architect or planning consultant to help with your project or development.

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Useful links

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Planning consultancy calculator Financing your project
    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/home-improvement/planning-consultancy-calculator
    3. https://www.planningportal.co.uk/permission/home-improvement/estimating-service
    4. https://www.planningportal.co.uk/permission/home-improvement/quick-quote-finance-calculator
    5. https://www.planningportal.co.uk/permission/common-projects/doors-and-windows
    6. https://www.planningportal.co.uk/permission/common-projects/drains-and-sewers
    7. https://www.planningportal.co.uk/permission/common-projects/electrics
    8. https://www.planningportal.co.uk/permission/common-projects/external-walls
    9. https://www.planningportal.co.uk/permission/common-projects/kitchens-and-bathrooms
    10. https://www.planningportal.co.uk/permission/common-projects/internal-walls
    11. https://www.planningportal.co.uk/permission/common-projects/roof
    12. https://www.gov.uk/guidance/party-wall-etc-act-1996-guidance

    The Planning Portal is delivered by PortalPlanQuest Limited which is a joint venture between TerraQuest Solutions Limited and the Department for Levelling Up, Housing & Communities. All content © 2022 Planning Portal.

    The Planning Portal is delivered by PortalPlanQuest Limited which is a joint venture between TerraQuest Solutions Limited and the Department for Levelling Up, Housing & Communities. All content © 2022 Planning Portal.