Home project cost per square foot guide

Cost per square foot is useful shorthand, but only when the square foot is doing comparable work.

Where it helps

Flooring, painting, siding, and simple decks often scale reasonably with measured area.

Where it misleads

Bathrooms, kitchens, windows, and basements contain fixed systems that do not shrink neatly with room size.

Normalize before comparing

Match finish level, access, demolition, region, and included scope before trusting two per-square-foot numbers.

Use it as a lens, not a verdict

Start with unit pricing, then move to a scope-based estimate once materials and conditions are known.