Terms of Service

Last updated: January 1, 2026

Use of the site

homeadditioncalc.com provides cost estimation tools for informational purposes. By using this site, you agree not to misrepresent calculator outputs as professional construction estimates or use them as the basis for legal, financial, or contractual decisions without independent verification.

Accuracy of estimates

All estimates are approximations based on historical and regional cost data. They're not quotes, bids, or guarantees. Actual construction costs depend on site conditions, contractor pricing, material availability, and local codes. Always obtain licensed contractor quotes before beginning any project.

Intellectual property

The content, design, and cost data on this site are owned by homeadditioncalc.com. You may quote or reference our data with attribution and a link back to the source page. You may not scrape, republish, or resell our content in bulk.

Third-party links

We link to external sources (BLS, NAHB, RS Means) for reference. We're not responsible for the content or accuracy of external sites.

Limitation of liability

To the maximum extent permitted by law, homeadditioncalc.com is not liable for any financial loss, project overruns, or decisions made based on our estimates. Use this tool as a starting point, not a final answer.

Governing law

These terms are governed by the laws of the United States.