How we make money

The calculators are free to use. Right now the site shows no paid links or ads.

In future, some pages may show a button or phone number for getting quotes from local contractors, run by a referral service that pays us for requests or calls. Any such link will be labelled. We may also show ads.

What payment never changes

• The numbers. Every result comes from the same published method and data for every option, and we never adjust a result because of what we might earn from it.
• Which options we show, or which one we call cheapest.

We don't sell personal information, and the calculator doesn't collect any: see Privacy.