A roof is a five-figure decision, and the estimate is the one document that tells you whether you are comparing the same job twice. Two roofers can walk the same Garland roof and hand you numbers thousands of dollars apart, and the gap is almost never the shingle. It is what each one did, or did not, write down. A clear estimate names every layer and every dollar before a single bundle is opened. Here is how to read one so the low number never turns into a surprise on the invoice.
Why two estimates for the same roof differ by thousands
The sticker price hides the scope. One roofer prices a full tear-off down to the deck, new underlayment, fresh flashing, and a code-required ventilation check. Another prices a layover of new shingles straight over the old, skips the flashing, and leaves the decking untouched. Both say "new roof" on the top line, and the second is cheaper for exactly the reasons that make it fail early. The only way to see the difference is a written scope that lists what happens under the shingle, not just the color on top. When you get a real number from what a new roof costs, it is built from those line items, not a round figure guessed from the driveway.
The line items a fair written estimate names
A straight estimate reads like a parts-and-labor list, not a slogan. Look for each of these spelled out, because a missing line is usually a corner about to be cut.
- Tear-off and disposal: how many layers come off, and that the old roof leaves the property.
- Decking: an allowance to replace any rotted or soft plywood found once the roof is open, at a stated per-sheet price so it is not an open-ended surprise.
- Underlayment and ice-and-water: what goes down over the deck and in the valleys and around penetrations.
- Flashing: new metal at the chimney, walls, and skylights, not a bead of caulk over the old.
- Ventilation: intake and exhaust brought up to code, since the shingle warranty depends on it.
- Cleanup: a magnet sweep for nails and a dated final walkthrough.
- Warranty: the workmanship term in writing, separate from the manufacturer coverage on the shingle.
The red flags that should slow you down
A verbal number is not an estimate, it is a sales opener, and it binds no one. Be careful with a quote that will not put the scope in writing, a large deposit asked for before any scope is agreed, a pressure to sign that day to lock a price, or a line that reads "we will see what is under there" with no per-sheet decking allowance. None of those are how a roofer who stands behind the work operates. A free, documented inspection with real photos costs nothing and gives you the written baseline every honest estimate should match.
Why the number is per square, not per roof
Roofing is priced by the square, which is one hundred square feet, because that is how material and labor actually scale. Across the DFW metro a replacement runs roughly $430 to $660 a square for architectural shingle, $540 to $820 for a Class 4 impact-resistant shingle that stands up to the hail this county sees, and more for designer or standing-seam metal. A typical Garland roof is near twenty-four squares, and stripping a second layer adds labor. Those are honest ranges, not a quote, and a good estimate shows the math instead of hiding it in one lump figure. If the number is a shock, that is a conversation to have on paper, and financing with lender-set terms shown up front is often part of it.
What should already be in writing before you sign
By the time you are deciding, the estimate should have removed the guesswork: the full scope, the material and its impact rating, the decking allowance, the workmanship warranty term, the payment schedule, and the start-and-finish window. Anything a roofer will only say out loud is worth asking them to write down. A roof replacement is not the place for a handshake number, and the roofer who writes it all out first is usually the one who bills you what the estimate said.
Get one honest, written roofing estimate for your Garland roof
A local roofer walks the roof, shows you the photos, and puts the scope and the price in writing before any work begins. Still have questions? Reach out and get a straight answer.