Disclaimer
Accuracy of results
We work hard to keep every formula, rate and reference table accurate and current. However, material densities, coverage rates, prices and building practices vary by region, manufacturer and over time. The rates used are stated on each calculator page — check them against your supplier’s data before ordering.
No professional advice
Nothing on this site constitutes engineering, financial, legal or other professional advice. Structural elements (foundations, load-bearing walls, roofs) must be designed or approved by a qualified professional and comply with local building codes.
Cost estimates
Cost figures are indicative planning numbers based on typical market rates. Actual prices depend on your location, supplier, season and project specifics. Always obtain itemised quotes before committing to a budget.
External links
The site may link to external resources. We are not responsible for the content or accuracy of third-party sites.