Nine out of ten roofing arguments I have watched between homeowners and crews trace back to one page of paper: the estimate. Nobody reads it closely until something goes wrong.
The fix is not complicated. You take the bid you have in hand, you read it line by line with a pen, and you ask three questions before you sign anything. That’s the whole job, and it takes about twenty minutes.
I’ve sat through enough of these walkthroughs to know which lines get skipped and which ones cost people money. Below is a method you can run tonight on any estimate sitting on your kitchen counter, whether it came from a national brand or a two-truck outfit down the street.
Why the cheapest bid is usually the most expensive one
A low number feels like a win. It isn’t always.
When a bid comes in thousands under everyone else, one of three things is happening: the contractor missed something, the scope got trimmed without anyone saying so, or the price is a teaser that will grow once work starts. In Seattle, where a tear-off means hauling old material down wet ladders in February, labor is the line item most likely to be underestimated on purpose.
What surprises homeowners is how often the cheaper estimate wins on paper and loses in practice. I’d rather pay a mid-range price to a crew that walks the roof before quoting than save a few thousand and discover mid-project that the decking was never included.
Line up four estimates and read only page one of each
Page one is where the real comparison lives. Everything after it is boilerplate.
Pull four estimates, spread them on the table, and compare these five rows side by side:
- Scope of removal: does the price include tearing off the old roof, or is it a layover? These are very different jobs.
- Decking allowance: how many sheets of plywood are covered before an extra charge kicks in?
- Underlayment and ice barrier: named product or vague phrase like “standard underlayment”?
- Ventilation: is ridge vent or a comparable system included, or is it an add-on?
- Disposal: dumpster fees, permit fees, and any dump charges should be baked into the total.
If two bids look identical on price but one omits the decking allowance, they are not the same bid. They are two different scopes wearing the same number. Write the missing items in the margin of the cheaper one and add your best guess at what they cost. You’ll usually find the gap closes fast, and sometimes the “expensive” bid turns out to be the cheaper one all along.
For rain exposure on any roof left open overnight, the National Weather Service forecast is the single best tool you have. Ask any contractor what their plan is if the forecast shifts mid-job.
The three questions to ask before you sign anything
You don’t need to be a roofer to spot a weak bid. You need three questions, asked in this order:
- “What’s not included in this price?” Any contractor worth hiring has an answer ready. Long pause, vague answer, run.
- “Who’s on the roof?” If the crew is subcontracted and the contractor can’t name them, ask how long they’ve worked together. Two years is a floor, not a ceiling.
- “What happens if you find rotten decking?” The answer should be a clear rate per sheet, written into the estimate, agreed in advance.
Ask these in person, not over text. Tone matters here. A good contractor will welcome the questions because it means you’re taking the job seriously.
What the manufacturer warranty actually covers
This section gets skipped more than any other, and it’s the one most likely to cost you money three summers from now.
Material warranties come from the shingle maker and cover defects in the shingles themselves. Labor warranties come from the contractor and cover installation mistakes. These are not the same thing, and one does not back up the other.
When you’re comparing the best roofing companies in your area, look for the workmanship warranty length on the page. Anything under five years is a warning sign. Ten years is decent. Anything longer tells you the contractor plans to be around to honor it, which is itself a useful signal.
The wording matters too. A “lifetime” warranty that requires the original homeowner to file in person, at the company’s office, with the original receipt, is worth roughly nothing. Ask what happens if you sell the house. If the answer is “it transfers with written notice and a small fee,” that’s a real warranty. If the answer is silence, it isn’t.
How to compare when the totals look identical
Two bids can land at the same dollar amount and still be wildly different jobs. Here’s what to weigh in that case:
Look at the slope of the roof. If it’s steep enough that the crew will need harnesses and staging, a low bid on that roof is suspicious. Crews don’t work steep roofs for free.
Look at the time on the calendar. A bid in April that promises completion in three days may be optimistic. A bid in November that promises completion before the first freeze is lying. Seattle rain does not negotiate.
Look at who answers the phone. Call the contractor’s office at 4 p.m. on a Friday. If a real person picks up, that’s a signal. If it rolls to voicemail and nobody calls back until Tuesday, factor that into your decision.
I’ve picked the slightly more expensive bid more than once, and I’ve never regretted it. The cheap bid that closed the job early usually ended up costing more in the form of lost weekends, awkward phone calls, and a punch list that never quite got finished.
What to check once the work starts
You don’t have to hover. You do have to look up twice a day.
Check that the underlayment is going down in full sheets, not scraps. Check that valleys have proper flashing, not caulk. Check that the crew is nailing in the pattern the manufacturer specifies, which is usually visible in the installation guide stapled to a bundle.
Stand outside during the first rain after the job wraps. Get in the attic with a flashlight the same evening. Stains on the underside of the decking show up before they show up on your ceiling. If you see drips, call the contractor the same day. Most workmanship warranties require prompt notice, and a homeowner who reports early looks like a customer worth keeping.
A 2022 report from the Department of Housing and Urban Development noted that improper flashing installation is one of the leading causes of premature roof failure on residential homes. That’s the kind of problem you can’t see from the curb. You need to look in the attic.
When a bid is missing something and you still want to hire them
Sometimes you like a contractor and their bid has gaps. That’s fine. Fix it before you sign.
Write the missing items into the estimate in pen, both copies, and have the contractor initial each addition. Note the price for each add-on, even if it’s a range. Confirm what triggers the upper end of that range.
Two signatures on a complete scope beats any verbal promise made on a driveway. Contractors respect it, and it protects both sides from a fight nobody wants six months later when the first storm hits.
Pull out the estimate on your counter right now. Read page one. Circle anything that doesn’t have a number attached to it. That one gesture will save you more money than any discount you talk a contractor into. So, which line on your current bid has no number next to it?
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