Metric vs. Imperial Length: Why Construction Still Uses Feet and Inches
US construction continues to use feet and inches largely due to deeply embedded industry standards — building materials (lumber, drywall) are manufactured and sold in standard imperial dimensions, existing tools and blueprints use imperial measurements, and a full industry-wide switch would require significant, costly retooling across the entire supply chain.
This is a specific, practical example of the broader imperial-persistence pattern covered in the general unit conversion guide, with its own industry-specific reasons.
Materials manufactured to imperial standards
Lumber, drywall, plywood, and most other standard building materials in the US are manufactured and sold in specific imperial dimensions (a "2x4," a 4x8-foot sheet of plywood) — an entire supply chain built around these standard sizes creates strong practical inertia against switching to metric equivalents that wouldn't cleanly match existing material dimensions.
Tools, blueprints, and trained expertise
Measuring tools (tape measures, levels), architectural blueprints, and the trained expertise of the existing construction workforce are all built around imperial measurement — switching would require retraining, new tooling, and updated conventions across an enormous, distributed industry, not a simple top-down decision.
Where metric does appear in US construction
Some specialized contexts (certain engineering specifications, international projects, or specific scientific and technical applications) do use metric measurements even within the US — but the general residential and commercial construction industry remains predominantly imperial for the practical reasons above.