Two bids for the same roof can be thousands of dollars apart — and the difference is almost never the shingles. It's what got left out. Here's how I read competing bids with homeowners, line by line, including my competitors'.
When my number isn't the lowest one on the table, I don't ask a homeowner to take my word for anything. I ask for something better: let's read the scopes together. Mine and theirs, side by side, line by line. Not the price pages — the scope-of-work pages, where each company spells out exactly what it's promising to install on your home.
I have yet to see another roofer's bid that includes a better system than the one I put on the table — and I don't say that lightly. Every time we do this exercise, there is a component missing from somebody's scope. Sometimes it's the starter course. Sometimes it's the ridge ventilation. Sometimes the underlayment is written so vaguely it could be anything. The homeowner almost never spots it on their own, because nobody ever taught them what a complete roof system looks like. And that's the whole game: the cheaper bid usually isn't cheaper — it's smaller.
A roof isn't a stack of shingles — it's a system, and I wrote a whole post about what's actually under your roof. Here's the part that matters when you're holding three bids: the manufacturer's warranty is typically tied to how many of that manufacturer's components get installed. Put enough of the system on the roof and the manufacturer stands behind the whole thing for decades. Put a bare-minimum roof up there and you get a bare-minimum warranty.
So that missing line item isn't just a corner cut on your house. It can be the difference between a warranty that means something and a piece of paper.
Here's a real example of vague-on-purpose, and it's one I see constantly. In California, roofing materials have to meet Title 24 — the state's building energy code. Every legitimate roof installed in our climate zone complies with it, because it's the law. So when a scope of work says "Title 24 compliant roof shingles" and stops there, ask yourself what that line actually promised you.
It didn't name a manufacturer. It didn't name a product line. It left the door open for that roofer to buy whatever is cheapest at the supply house that morning — as long as it clears the legal bar. That's not a specification. That's wiggle room.
On my contracts, the line names the product — Owens Corning or Malarkey, the exact line, the color you picked. If a bid you're holding doesn't name the product, ask them to write it in. Then watch what happens to the price.
"Just saying 'Title 24 compliant' gives a roofer the option to buy the cheapest thing that's Title 24. If the scope doesn't name the product, it isn't promising you one."
I want to be fair to the other direction too, because this cuts both ways. There is such a thing as expensive and good. There is also such a thing as expensive for the sake of being expensive.
Designer shingles are the honest version of expensive. Products like CertainTeed's Presidential line — thick, multi-layered shingles sculpted to look like wood shake — genuinely cost more: more material, more weight, more labor to install. A designer-shingle roof runs about what a brand-new tile roof costs. If that's the look you want, great — just make sure the scope names that exact product, and honestly, compare it against real tile while you're at it, because you're in the same money.
But if someone quotes you designer-tier money for a standard architectural shingle, those extra thousands aren't going on your roof. They're going in someone's pocket. Read the product line on the scope. Both directions — too cheap and too expensive — get caught the same way.
Some things I don't weigh against the price at all. If I were handing my mother a checklist, it would say: walk away when you see any of these.
Sometimes the honest answer to "can you sharpen the number?" is yes. When a family's budget is genuinely tight, there is exactly one place I'll subtract: the ridge ventilation. We can swap a full ridge-vent run for O'Hagin-style low-profile vents — they still do the venting job, at a lower cost — and I'll say so out loud, on the scope, instead of quietly deleting a line and hoping nobody reads it.
What I won't touch is the underlayment, the starter, the flashing, or how the roof is nailed. The parts you can't see from the street are the parts doing the work. Cutting those to win a bid isn't a discount — it's a different, worse roof wearing the same name.
"Cheap is not good, and good is not cheap. The bid you want is the one that shows you — in writing — where every dollar sits on your roof."
You don't need to become a roofing expert to protect yourself. You need each bidder to put the system in writing — product names, component by component — and then you need to read the scopes side by side. The moment you do that, the mystery of the price gap usually solves itself.
It costs you nothing to have a second set of eyes on them. Send me the bids you've collected and I'll tell you what I see — what's in them, what's missing, and what I'd do if it were my house. Same answer I'd give a family member, even if you don't hire GAX.
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