Contact

Email us at [email protected].

What to write about

• A mistake. Tell us the page, the numbers you entered and what looks wrong. We check every report against the source.
• A new calculator. Tell us the job you need to work out.
• A question about a number. Every figure has a source listed on its page, and we are happy to explain how we used it.

We read every message. We cannot give advice on a specific building job; for that, ask a local contractor or your building department.