A home's floor area does not directly describe the amount of roofing required. Roof geometry, overhangs, pitch, and attached sections affect the surface. An estimate based only on living area leaves important measurement assumptions unresolved.
What to do next
Ask what area the proposal uses and how it was determined. Compare the same roof sections across bids. Treat calculator figures as rough estimates and request a property-specific scope before making a budget commitment.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.