Question 1

How many squares is my roof?

Accepted Answer

One roofing square equals 100 square feet of roof surface. A 1,200 sq ft footprint at a medium pitch works out to roughly 15–16 squares once pitch and waste are included.

Question 2

How much does a new roof cost?

Accepted Answer

Asphalt shingle roofs typically run $4.50–$8.00 per square foot installed ($450–$800 per square). Metal, tile and slate cost considerably more. This tool separates material from labour so you can localise both.

Question 3

Does roof pitch affect cost?

Accepted Answer

Yes — a steeper roof has more surface area than its footprint and is slower and riskier to work on, so both material and labour rise. Pick the closest pitch band above and the estimate adjusts automatically.

Question 4

Should I include a waste allowance?

Accepted Answer

Yes — 10–15% is standard to cover cuts, starter and ridge/hip caps, and valleys. Complex roofs with many hips and valleys sit at the higher end.

Roof Replacement Cost Calculator: 3,000 sq ft roof

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