Use this page for questions about the site: a calculator result that looks wrong, a source you think we have misread, a broken link, or a business enquiry.
Looking for a roofing quote? This form does not reach any contractors. To size your roof and estimate materials, use the roof pitch calculator and the roofing square calculator. Each calculator page has a separate form for requesting quotes from local roofers.
Send a message
We read everything, but this is a small site and replies can take a few days.
This form is not yet connected.
What helps us fix things quickly
- Calculator errors: the page, the inputs you typed and the output you expected.
- Source questions: the figure you are asking about and the page it appears on. The methodology page lists every source we use.
- Corrections: a link to the public data that contradicts ours. We update figures when a better public source exists.