How to compare widely varying roof replacement estimates
Contractor quotes often have massive price spreads because they rely on completely different materials, installation methods, and warranties. Without technical knowledge of specific line items—like whether a roofing underlayment is nail-on or peel-and-stick—people cannot tell if a surprisingly low bid is a good deal or missing crucial elements.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
How to compare widely varying roof replacement estimates
- 1Asking online forums for professionals to explain what specific materials and labor costs to look for in the itemized bidsDid this help you?
- 2Posting the itemized estimates on specialized online forums to get feedback from industry professionalsDid this help you?
- 3Requesting multiple bids to look for price consensus or outliersDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Hi! I’m looking for some help figuring out how to compare some widely varying estimates for a roof replacement for an old metal roof.”source ↗
“What am I missing here? Obviously I need to compare the estimates in detail, but frankly, I don’t know what I’m looking at/for besides the difference in warranties.”source ↗
“I have other vendors lined up for estimates but from the two estimates received so far, I'm surprised by the spread. The lower bidder seems too good to be true? Have I overlooked anything?”source ↗
“Sorry, based on other posts I've seen I had assumed cost and underlayment used were enough to justify.”source ↗
“Is there a huge price or quality difference in underlayment? I'm not very familiar but it seems the Vulcaseal is nail on and Polyglass is peel and stick.”source ↗