How many shingles needed for a 2000 square foot house depends on roof area, which is larger than house footprint due to pitch, overhangs, and complexity. For a 2000 square foot footprint, typical roof area ranges from 2,200 to 3,000 square feet depending on whether it is single story with low pitch or two-story with steep pitch, multiple valleys, and dormers. Roofing is measured in squares, where one square equals 100 square feet. So a 2,200 square foot roof is 22 squares, and a 3,000 square foot roof is 30 squares. Asphalt shingles are packaged in bundles, with typically 3 bundles per square for architectural shingles. Therefore, for 22 squares you need about 66 bundles, and for 30 squares you need about 90 bundles, plus 10 to 15 percent waste factor for cuts, valleys, and ridges, so add 7 to 14 extra bundles. You also need starter strips and ridge cap shingles, typically one bundle of starter per 100 linear feet of eave and rake, and one bundle of ridge cap per 20 linear feet of ridge. So for a 2000 square foot house, expect to need roughly 70 to 100 bundles of field shingles plus starter and ridge. Exact quantity requires measuring roof planes, pitch, and linear footage of eaves, rakes, ridges, and valleys. Always order slightly more than calculated to account for waste and future repairs.
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