Free home-building viability tool

Could you build the home you want?

Put in a few rough numbers and see how selling, keeping your place, or waiting could stack up.

Free to use. No account required.

Three ways forward

Sell, keep, or wait?

See how each option stacks up.

Sell and build

Put what is left after the mortgage and selling costs towards the section and build.

Keep and build

Keep your current home in the picture, including rent, running costs, and the extra lending you may need.

Build later

See what could change if house prices, build costs, income, and savings move over time.

Questions

Questions people ask

No. CouldBuild is free. There is no card, no trial period and no ads.

No. Start without creating an account and keep your plans on your device. Create an account only when you want to save, share, or use another device.

It gives you a rough starting point, not an approval or financial advice. Check the numbers with your bank or broker, builder, and lawyer.