Roofing cost, does it seems right? Anyone got roofing done lately?

Got quoted the other day for 11 K + GST for roofing of a land area 800-ish SQFT medium slope spanning ground floor and first floor. I also have additional vents for bathroom to be built.

The existing roof is asphalt shingles from early 90s, about 30+ years old. We get a lot of wind though.

They will install Owens Croning Duration Shingles with snow guard. Company is Parker Johnston.