San Antonio Roof Replacement Cost Calculator
Built for homeowners in San Antonio and within about 70 miles of the city, across Bexar, Comal, Kendall, Kerr, Gillespie, Guadalupe, Hays, Atascosa, Wilson, and Blanco counties. Pick a roofing material, enter your address, and we will measure your roof from current satellite imagery to give you a ballpark size and cost range. It is a starting point for planning, not a quote. Roofs under heavy tree cover or with a very complex roofline often cannot be read reliably from the air, and when that happens we will tell you instead of guessing.
Already know the roof needs replacing? Review financing options for your roof replacement.
How much does a new roof cost in San Antonio?
A full residential replacement in the San Antonio area typically runs $8,000 to $22,000. Where your house lands in that range comes down to a handful of measurable things, not to luck.
The big ones are roof square footage, measured in squares of 100 square feet, and pitch, since a steep roof takes more labor and more safety setup than a low one. After that it is the number of roof planes and valleys, how many layers have to come off, what shape the decking is in once it is exposed, and which material you pick.
Metal sits in its own bracket. A metal roof in this market typically runs $18,000 to $45,000 installed, so if that is the material you want, compare it against the asphalt number as a different decision, not as an upgrade line.
One thing throws off almost every homeowner estimate: the square footage of the roof is not the square footage of the house. Pitch, overhangs, and multiple planes mean the roof is always larger than the floor plan, sometimes much larger. That roof area is what the calculator above measures.
How accurate is an online roof cost calculator?
Accurate enough to plan around, not accurate enough to sign. Treat the number as a budget bracket, then get a firm written price after someone walks the roof.
Satellite measurement is genuinely good at the outside geometry. It reads the footprint, the roof planes, and approximate area well, which is most of what you need to talk about size and material.
What it cannot see is everything under the shingles: the condition of the decking, how many layers are already up there, flashing and ventilation problems, and rot. Those are the items that actually move a price, which is why no aerial tool can be the last word.
Heavy tree cover or a very complex roofline can defeat the read altogether. When the imagery will not support a reliable measurement, this tool says so instead of handing you a number we cannot stand behind.
Should I go with the cheapest roofing bid?
Usually not, and the reason is almost always what got left out of the scope. Two bids on the same roof rarely cover the same work, so the gap between them is often a list of things one crew plans to skip.
Check these line by line, bid to bid: is decking replacement included or is it priced as a surprise once tear-off starts, is the underlayment felt or synthetic, are new flashing and pipe boots in the price or are the old ones being reused, is ridge ventilation addressed, are the permit and disposal included, and is there a written workmanship warranty on top of the manufacturer warranty.
A low bid is not automatically a bad bid. Sometimes it is a lean local crew with low overhead doing solid work, and the only way to tell is to compare line items rather than totals.
The cheapest bid and the most expensive bid are both worth questioning. The useful question is not who is lowest, it is what each one includes.