A roofing square
One roofing square equals 100 square feet of roof surface. Contractors estimate surface area, not simply the home’s conditioned floor area.
Pitch and shape matter
A steeper roof has more surface area over the same footprint. Valleys, hips, dormers, and cut-up geometry increase waste and labor.
Measurement methods
Contractors may hand-measure, use aerial reports, review plans, or combine methods. Final ordering includes waste appropriate to the design and material.
Next step: Use this guide to create a consistent set of questions before requesting or comparing contractor bids.