Roofing quotes vary widely for the same house, and homeowners deserve to know why. Here's what actually moves the number.
The structural drivers
Size and pitch. Square footage sets the baseline, but pitch multiplies it. Steep roofs are slower and require more safety setup; the same shingles cost more to install on a steep Victorian than a low ranch.
Complexity. Every valley, dormer, chimney, and skylight is flashing detail work — and flashing details are where roofs actually leak. Simple gable roofs cost less than cut-up rooflines for honest reasons.
Layers to tear off. Some older homes carry two layers of old shingles. Tear-off labor and disposal scale with what's up there.
Decking condition. The unknown until tear-off. Rotted or delaminated decking must be replaced before new shingles go down — an honest roofer budgets a contingency for it and shows you photos of what they found rather than burying it in the bill.
The material drivers
Standard architectural shingles are the market baseline. Upgraded impact-rated shingles cost more up front — worth a conversation in hail country. Underlayment quality, ridge venting, and drip edge are small line items that separate a roof built to last from one built to pass a drive-by.
What keeps it reasonable
Simple rooflines, one existing layer, sound decking, and scheduling in a normal season rather than in the panic after a storm.
The real number for your roof takes an inspection, with photos, and an honest repair-or-replace answer first — see repair vs. replace, the roofing service page, our pricing page, and the roofing questions in our FAQ.