Why Are Roofing Quotes So Different?
Published by TradeIQ · Updated
You got three roofing quotes and they are thousands of dollars apart for what looks like the same job. That gap can feel like someone is trying to rip you off, but usually it comes down to four specific things. Understanding why roofing quotes vary makes both the high one and the low one make sense. Once you know the reasons, lining them up side by side is the easy part.
Key takeaways
- "Architectural shingles" can mean a cheap line or a premium one, and grade drives price.
- Decking rot is unknown until tear-off, so some quotes include an allowance and some do not.
- A certified installer can register an upgraded system warranty that covers labor, and the fee behind it is priced into his bid. That is a real reason one quote sits higher.
- The biggest gap is often retail pricing versus insurance-claim pricing, not quality.
- The "25% rule" is a Florida provision, not a national code, and Florida itself gutted it in 2022 for roofs built to the 2007 code or later.
The real reasons two roofing quotes rarely match
It is almost never random. Four drivers explain most of the gap: the grade of the shingle, how each roofer handled the unknown decking, the warranty they built in, and whether they priced the job retail or to an insurance claim. Here is each one.
Material grade: the same word, different product
"Architectural shingles" covers a cheap builder-grade line and a premium, impact-rated one that costs far more and lasts longer. Two quotes can both say "architectural" and mean very different shingles. Even the basic choice between three-tab and architectural changes the price and the lifespan, so ask exactly which brand and line each roofer is quoting.
Why the decking number always seems to change
No one knows how much rotted plywood is under your roof until the old one comes off. One roofer builds a decking allowance into the quote so there are no surprises. Another leaves it out to look cheaper, then charges you per sheet in the middle of the job. Same roof, very different quotes, and the "cheap" one can end up higher.
Warranty tiers: two men, same shingle, different paper
Two roofers can nail down the identical shingle and register two entirely different warranties on it, and the paper is not free. A manufacturer-certified installer can register an upgraded system warranty that covers labor for a defined window, and the certification, the training, and the registration fee behind that all get priced into his bid. So a higher number here is buying you something specific. It is one of the few gaps in this whole list where the expensive quote is plainly the better deal.
The shingle maker's own warranty is a separate subject, and mostly it is not what you were told it was. The words "Limited Lifetime" describe who is covered rather than for how long, and our page on what a roofing quote should include opens the actual manufacturer documents to show you the year the labor coverage quits. For the purpose of your three bids, one question does the work: ask each man which warranty he intends to register, by its name, and ask to read the document instead of the sales sheet about it. Whoever is registering nothing will change the subject.
Retail pricing versus insurance pricing, the biggest gap of all
This is the one most homeowners miss. Some roofers price to match what an insurance company pays out on a claim, while others price a straight retail, out-of-pocket job. Same roof, two pricing models, and a large gap that has nothing to do with quality. If one quote is way off, ask whether it was built around an insurance claim.
The "25% rule" a roofer may use to justify the bigger number
Sooner or later somebody quotes you a full tear off and blames the 25% rule. Here is what it really is. It is a Florida provision, compelled by Florida Statute 553.844 and written into the Florida Building Code, which says not more than 25 percent of the total roof area or roof section may be repaired, replaced, or recovered in any 12 month period unless the whole roofing system is brought up to current code. It is not in the model codes. The IBC, the IRC, and the IEBC contain no 25 percent trigger and no 12 month clock at all.
Two more things get told to you wrong. The unit is the total roof area or a roof section, not one slope. Florida defines a roof section by things like expansion joints, parapets, and changes in elevation, and it expressly says hips and ridges do not divide one, so your back slope is not its own section. That makes the trigger far harder to trip than "a quarter of one side of the roof" makes it sound.
And Florida largely defused the rule in 2022. Senate Bill 4-D added subsection (5), which says that if the roofing system was built, repaired, or replaced under the 2007 Florida Building Code or any later edition, only the portion actually being worked on has to meet the current code. The 2007 code took effect on March 1, 2009. So the doomsday version of this rule now reaches mostly pre 2009 roofs, in one state.
What to do with that: if you are not in Florida and a roofer cites the 25% rule at you, ask him to show you the code section. He will not be able to. If you are in Florida, ask when your roof was last done. Once you know why the numbers differ, the next step is lining them up on equal footing, which is covered in our guide to comparing roofing quotes.
Still cannot tell why one quote is double another?
Send all three over. A TradeIQ roofer can point at the driver doing the work in your particular spread: the shingle line, the decking allowance, the warranty somebody is registering, or a roof that got priced to an insurance claim instead of to you.
Find out whether the expensive bid is the right one
Everyone you could ask about your price gap is standing on one side of it. The high bidder tells you the cheap one is cutting corners. The cheap one tells you the high one is padding. Neither man is describing your roof, he is describing his own bid. Send all three to a roofer who wrote none of them, and be ready for the answer nobody in your driveway is able to sell you: sometimes the expensive quote is the honest one, and here is the line item that proves it.
Good fit: a Written Review of all three bids.
Get an unbiased expert reviewFrequently asked questions
- How accurate are roofing estimates?
- A good estimate from a roofer who physically inspected or measured your roof is usually accurate, aside from decking damage that only shows after tear-off. A drive-by number with no measurement is a guess and often changes.
- What is the 25% rule for roofing?
- It is a Florida provision and it lives nowhere else. Florida Statute 553.844 and the Florida Building Code say not more than 25 percent of the total roof area or roof section may be repaired, replaced, or recovered in any 12 month period unless the whole roofing system is brought up to current code. The IBC, the IRC and the IEBC that the rest of the country builds from contain no 25 percent trigger and no 12 month clock. Two details get quoted at homeowners wrong: the unit is the total roof area or a roof section, not a single slope, and Florida largely defused the rule in 2022 with Senate Bill 4-D, which exempts roofs built or replaced under the 2007 code or later. Outside Florida, a roofer leaning on this to sell a tear-off cannot show you the section, because there is not one.
- Why is one roofing quote so much cheaper than the others?
- Usually because it leaves something out, like a decking allowance, new flashing, or a permit, or because it was priced to an insurance claim instead of a retail job. A cheap quote often catches up with you as a change order later.
- Does a higher roofing quote mean better work?
- Not always. A higher number can reflect a better shingle grade, a stronger warranty, or a certified installer, or it can just be padding. The only way to know is to compare the scope line by line, not the totals.