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Financing your extension

Whether you are thinking about a single or two storey extension, careful planning is essential to make sure you are not faced with spiralling costs. Before you start it’s important to prepare a budget and calculate the total cost of the project against the estimated increase in your property value. Working out how to finance an extension of your home is the most important element of the planning phase and requires monitoring throughout the project.

The Home Owners Alliance offer detailed guidance about how to budget for a home improvement project and advise on the points to consider before you start work.

Read the Home Owners Alliance's guide to re-mortgaging1.

Further information is also available at from the following links:

Useful links

Find a Trade Professional

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

Find a trade professional


Useful links

Interactive guides Common projects Make an application


Planning Consultancy Calculator Financing your project
    1. https://hoa.org.uk/advice/guides-for-homeowners/i-am-buying/how-to-remortgage/
    2. https://www.moneyadviceservice.org.uk/en/articles/pay-for-home-improvements
    3. https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/294604/New_way_to_pay.pdf

    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.