Editorial & Methodology Policy

Last updated: 28 April 2026

BuildMetricLab exists to give US homeowners, DIYers, and licensed

trade professionals accurate, no-nonsense quantity and cost estimates

for common construction tasks.

Principles

1. Show your work. Every calculator displays the exact formula

used. If you don't agree with the method, you can reproduce the

calculation by hand.

2. Cite the source. Where a calculator depends on industry

benchmarks (e.g., bricks per ft², density, R-values per IECC,

pounds of concrete per cubic foot) the reference is listed under

Sources & Methodology on the tool page.

3. Estimates, not promises. We include standard waste factors

and mark clearly where site conditions invalidate a number. We do

not claim exactness the numbers cannot deliver.

4. No sponsored output. Affiliate partners have zero influence

on calculator formulas, defaults, or recommendations.

5. Versioned math. When we update a formula, the tool's

`last_updated` date changes and the change is recorded in the

site changelog.

Default unit prices reflect typical US national-average building

material and contractor rates for the publication date noted on each

tool. Pricing varies meaningfully by region (Northeast vs Mountain

West), by lumber and steel market, and by job size. Every price

field is editable so you can plug in your own quote.

Where a calculator references a building code (IRC, IBC, IPC, IMC,

NEC, IECC), we use the most recent published edition unless

noted. Local code amendments override the model code — your

authority having jurisdiction (AHJ) is the source of truth.

All calculators are reviewed before publication for:

relevant).

"reinforcement bar", "drywall" not "plasterboard", "lumber" not

"timber").

Email [email protected] or use the feedback button on

any tool page. We aim to respond within five business days.