A Northern California homeowner ran into a familiar problem after receiving quotes for a roof replacement: estimates of $20,000 to $25,000 that looked similar at first glance.
After they reached out for advice on Reddit, the biggest concern in the replies was not the shingles themselves but where surprise costs could emerge after the old roof comes off.
Here's what to know
In r/Roofing, the homeowner said their asphalt shingle roof was roughly 3,100 square feet and already more than 20 years old.
Several independent contractors had told them a full replacement made sense, and while there were no active leaks, they wanted to get ahead of any potential leaks.
The quotes mostly recommended CertainTeed Landmark shingles, synthetic underlayment, drip edge, flashing, starter and ridge cap materials, permit costs, cleanup, ridge-vent attic ventilation, and some allowance for decking replacement. But one contractor said ridge vents would be better for this roof than single O'Hagin vents.
"I'd really appreciate some help understanding what I should be looking for," the poster said.
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Commenters largely agreed that the pricing did not sound unusual for that roof size and region. One wrote, "Those are honestly very fair estimates. I constantly see estimates that are about 1,000 per square so you getting it for about 7 to 800 is very reasonable."
What worried Reddit users the most was the possibility of hidden damage once the job began.
"Make sure the quote spells out what happens if they find bad decking... Price per sheet, approval before replacement and photos of what they find. [That's] where surprise costs can add up fast," a commenter remarked.
More background
Indeed, roof replacements can become much more expensive once crews expose damaged plywood or framing. If a contract includes only a vague "allowance" for decking, homeowners may have little sense of how much extra they could owe if problems are uncovered.
Another commenter noted that a home's square footage does not always match the roof. Features like overhangs, garages, covered porches, and a steeper pitch can all add surface area and labor, which helps explain why similar-looking homes may get very different quotes.
Others highlighted contractor vetting as part of the decision. One Bay Area homeowner comparing quotes for a roof-and-gutter project said they checked whether the contractor had a "proper license and how long the company has been in business." Another made a wish list and made sure everything they wanted was in the contract before signing.
What can be done?
In short, paying less attention to the base number and more attention to "change order" terms will help you avoid unexpected expenses. If a contract does not spell out decking replacement costs per sheet, whether homeowner approval is required, and whether photos will be provided, the final bill can climb well beyond the original quote.
Confirm that every bid covers the same scope of work, including permit handling, cleanup, flashing, ventilation type, decking allowance, and any extra work. If one estimate includes ridge ventilation and another does not, the comparison is not truly equal.
Paying attention to those details may not always reduce the upfront price, but they can lower the odds of confusion if something goes wrong.
Where can I learn more?
These stories dig into similar home-improvement headaches, from surprise charges to damage disputes. They cover a plywood upcharge before solar, a leak dispute after panel installation, a shingle-painting experiment, an insulation quote fight, and flood-focused blue-roof technology.
• A homeowner saw a $6,400 plywood charge added before moving ahead with solar.
• In Texas, one homeowner says solar panels left his roof leaking for months.
• In Florida, a husband's white roof experiment sparks warnings over painting asphalt shingles.
• In New Jersey, a homeowner feared an outrageously expensive quote for new insulation.
• Cities are testing smart blue roof technology to hold stormwater back before floods.
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