Calculators
Calculators for the money and dates of a self-build. They run in your browser and nothing you enter is sent anywhere.
Used at Stage 3: Arrange finance and budget
Try it with your build
Stage payment planner
See whether your own funds cover the gaps between mortgage stage payments.
Open calculator →Used at Stage 4: Insure the build
Try it with your build
What cover do I need?
Six quick questions about your build. See each policy it needs, why, and when it has to start.
Check my cover →Used at Stage 2: Design and planning permission
Try it with your build
Planning decision date tracker
Use the date the council received your application to estimate public comment, council decision and appeal deadlines.
Open calculator →Used at Stage 1: Find and check a site
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Build timeline planner
Enter how long each phase will take. We show your earliest move-in date, or the latest start date if you have a move-in deadline.
Open calculator →Used at Stage 3: Arrange finance and budget
Try it with your build
Help to Buy calculator
Estimate your Help to Buy tax refund for a first home, from its value and the income tax you’ve paid.
Open calculator →Used at Stage 3: Arrange finance and budget
Try it with your build
Self-build cost calculator
Budget for build and VAT, site, fees, connections, kitchen and finishes outside your contract, and contingency.
Open calculator →Used at Stage 3: Arrange finance and budget
Try it with your build
Mortgage affordability calculator
Compare your project cost with the Central Bank mortgage lending limits (the most you can borrow against your income) and see how much you must cover from your own funds.
Open calculator →