Price per square

Material? Labor? where?

Labor and its in New England, Rhode Island to be exact 25 squares.

Prices vary so much from area to area your best bet is to just get 3 bids. You have also not mentioned what type of shingle and grade. Big dif between 15 year Certainteed and 50 year Architectural shingles.

If you are tearing off and replacing a good average to go by for a roof with one layer, low pitch (below 8/12), one story, and not terribly "cut up" would be $200-$225 per square in my area.. I'd say that price may vary considerably in different parts of the country. I live in Kentucky... Hope that helps