You should know how a site that gives away cost estimates stays funded, and which parts of the page are commercial. This page is the complete answer.
We show display ads on article and calculator pages. Advertisers pay per impression or per click. We do not control which specific ads appear, and we do not endorse advertised products. Advertising containers on this site are visually distinct and labeled "Advertisement."
Advertising revenue depends on pageviews, which means we benefit when more people visit. It does not depend on what number we publish — a lower published cost range does not reduce ad revenue.
Some pages include a form where you can request local quotes. If you submit it, your information is shared with licensed contractors in your area who may contact you. When a contractor receives an inquiry through that form, we may be paid a referral fee.
What this means for you: the form is optional, submitting it is not required to use anything on this site, and the calculator works fully without it. Submitting it does not cost you anything, but it does mean you will be contacted.
What this means for our content: nothing. Referral partners do not review, approve, or influence our published cost ranges, technical explainers, or FAQ answers. Where our published range is lower than a partner's pricing, we publish our range. See the Editorial Policy for how this is enforced.
A single number is easy to inflate and impossible to check. Publishing the formula, the input constants, and the uncertainty band means you can reconstruct the estimate and see where your project would land. It also means our numbers can be challenged, which is the point. See Methodology.
If anything about this disclosure is unclear, ask: hello@windowcosthq.com. If you believe a commercial relationship has influenced our content, tell us — that is a correction we treat as serious.