Disclaimer

Last updated: 24 June 2026

BuildMetricLab provides free online construction calculators, material estimators, and unit converters. The results they produce are estimates for educational and planning purposes only. They are not, and must not be treated as, professional advice or a substitute for a licensed contractor's quote, an engineer's calculation, or a building permit sign-off.

What this means in practice

• Quantities are estimates. Every real-world job has site-specific conditions (waste, cut-offs, substrate, access, and crew) that change what you actually need. Verify every quantity with your supplier or contractor before ordering. We recommend building additional contingency on top of the waste assumptions shown.
• Costs are illustrative. Prices shown in the calculators reflect typical US retail/contractor rates at the time of publication. Actual prices vary by state, region, supplier, lumber market, and job size. Always get written quotes from licensed contractors.
• No structural or code advice. Calculators that touch beams, headers, footings, loads, slope, drainage, electrical, plumbing, mechanical, or HVAC sizing are screening tools only. Designs that affect structural integrity, life safety, or code compliance — including the International Residential Code (IRC), International Building Code (IBC), International Plumbing Code (IPC), International Mechanical Code (IMC), National Electrical Code (NEC / NFPA 70), and International Energy Conservation Code (IECC) along with any state, county, or municipal amendments — must be signed off by a licensed professional in the jurisdiction where the work is being done.
• Permits and inspections. Many projects require building permits, zoning approval, HOA review, historic-district approval, or utility-locate marking before work begins. This site does not determine whether any specific work requires a permit — that is the homeowner's or contractor's responsibility under local law.
• No warranty. Calculators are provided "as is". Formulas are documented on each tool page so you can verify the method. ALL EXPRESS AND IMPLIED WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. Use of this site is at your own risk.

When to consult a licensed professional

Always engage a suitably licensed professional before:

• Any structural alteration (removing walls, cutting joists or rafters, new openings, beam sizing, or foundation work).
• Electrical, gas, plumbing, mechanical, or HVAC work that requires a permit in your jurisdiction.
• Work near a property line, easement, septic field, well, floodplain, or wetlands.
• Roofing, waterproofing, or grading that affects drainage to public storm or sanitary sewers.
• Anything involving asbestos, lead paint, mold, or other regulated hazardous materials (federal RRP rule, EPA, OSHA).
• Work in homes built before 1978 — federal lead-paint disclosure and RRP rules apply.

If in doubt, don't. Hire a licensed contractor or design professional.

Statutory and consumer-protection rights

Nothing in this disclaimer limits any rights you may have under applicable federal, state, or local consumer-protection law that cannot be excluded or limited by contract.