Free window cost tools
Practical calculators for UK homeowners researching window replacement. Every tool runs in your browser. No email wall, no lead broker, no sales call. Use them for free, as many times as you want.
Window Cost Calculator
Six questions, a live price range. No email wall, no lead form.
Open calculator → NewEnergy Savings Calculator
How much will you save per year on heating bills after a window upgrade? Factor in heating type, postcode, and window age.
Calculate savings → NewGrant Eligibility Checker
Find out in 30 seconds whether you qualify for ECO4, HUG2, GBIS, or Green Deal funding toward your windows.
Check eligibility → NewPayback Period Calculator
Install cost vs annual savings. Break-even year with gas or heat-pump inflation built in.
Calculate payback →Why free?
Because these calculators should be free. They're basic arithmetic wrapped in a UI. Every other UK window site charges you in the only currency that matters: your phone number, your email, and permission to sell your details to five installers. We'd rather earn our keep through transparent affiliate links to Checkatrade, Anglian, Velux and others — and only when you actually click through, having read the guide and decided for yourself.
More tools are coming. If there's a calculation you want us to build, email info@saasquatch.co.uk.