About

About DIYCosts

DIYCosts is a free set of UK home-improvement calculators built to answer one question: what will this job actually cost before I get to the till? Most manufacturer tools tell you a quantity but hide the price, and most quantity calculators ignore the sundries that quietly inflate a project. We do both — materials and money, in one clear estimate.

How the estimates work

Each calculator uses standard UK coverage rates, pack sizes and sensible waste allowances, all of which you can adjust to match the exact product you're buying. Because coverage and prices vary by brand, we show every input so you can tune the estimate rather than trust a black box.

A note on accuracy

These tools are for planning, not for placing a final order without checking. Walls are never perfectly square, timber varies, and the coverage printed on a tin is a best case. Always confirm quantities with your supplier before buying, and add a little extra for the surface or two that behaves unexpectedly.

Independence

We're not affiliated with any manufacturer or retailer, so the estimates aren't steered toward any particular product. The site is supported by advertising, which lets the calculators stay free to use.