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What's the best way of financing a house extension?

6 min read
Oct '25 • by Heather

Quick summary

The best way to finance a house extension depends on your project size and finances. For small projects under £20,000, savings or credit cards work well, but for over £30,000, remortgaging or a further advance using your home’s equity is often cheapest, providing low interest rates over 25 years. Personal loans are limited to around £30,000 and shorter terms, while larger projects benefit from longer-term remortgages.

When it comes to financing your project, whether it’s an extension, conversion, or renovation, it can be difficult to know which route will be best for you. Do you dedicate yourself to the long slog of saving? Or is there perhaps a loan out there that can give you the results you crave now?

To help you assess your options, our dedicated finance team have put together this advice, so you know what to expect now and in the future…

Ways to fund your project

There are a number of ways to secure the finance you’ll need to undergo a large home improvement project. They are…

  • Savings
  • An unsecured personal loan
  • Remortgaging or using a further advance

As with everything, each of these options has its own pros and cons. Figuring which will be the right one for you will depend on your own financial circumstances, the state of the finance market, where you’re at in your mortgage, plus an understanding of how much value your project will add to the price of your home.

See how much you can borrow

Get an indicative idea of your borrowing potential by answering the simple questions below

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