Contact

Use this page for factual corrections, broken-tool reports, or feedback about a page that needs fixing or clarifying.

Best reasons to get in touch

Useful messages usually point out a wrong assumption, a broken calculator state, an unclear sentence, or a page that no longer matches the way the site works.

What helps most

If you can, include the page URL, the tool you used, the input that caused trouble, and the exact part that looked wrong or confusing.

What this page is not for

It is not a general contractor enquiry form or a place for urgent site-specific professional advice. It is mainly here for corrections, fixes and content feedback.