Free tools
Interactive tools for comparing quotes and planning payments
Four free calculators built from the same paperwork problems that come up on real UK building jobs: unclear quotes, front-loaded deposits and renovation budgets that miss the extras.
Who these are for
Built for homeowners comparing quotes, not for tradespeople estimating jobs
Every figure you enter stays in your browser and is only ever illustrative — the tools do their sums on the numbers you type in, they do not know your actual builder's pricing. Use them to structure the conversation with your builder, not to replace it.
Builder quote comparison
Enter up to three quotes and their inclusions to see a like-for-like adjusted comparison, not just a bottom-line total.
Open toolStage payment planner
Build a stage payment schedule from your contract value and check whether the deposit or early stages look front-loaded.
Open toolRenovation budget calculator
Add build cost, extras and a contingency percentage to see your full likely commitment, not just the headline quote.
Open toolFree builder quote checker
A guided check of a single quotation against the things a proper written quote should contain.
Open toolRead first
These tools work best alongside a proper guide
Numbers on their own only get you so far — the background on what a fair quote and a fair payment schedule actually look like is in these guides.
Want it all in one pack?
The Homeowner Protection Pack bundles a printable quote comparison sheet, scope of works template and stage-payment planner for £19.99.
Get the Protection Pack – £19.99Builder Proof UK publishes general educational information for homeowners. It is not legal, structural, surveying, planning, electrical, gas, insurance or financial advice, and it does not replace advice from a suitably qualified professional for your specific project.