Why the Cheapest Bid Is Almost Never the Cheapest Roof

You got three quotes. One is dramatically lower than the others. Tempting — but here's what is usually missing.

What gets quietly removed from a low bid

• Ice & water shield coverage. Code minimum vs. extended coverage in valleys, eaves, and around penetrations. In ice-dam country, this is the single biggest difference between a roof that leaks at year three and one that doesn't.
• Synthetic underlayment. Felt is cheaper. Synthetic lasts longer, lays flatter, and grips better in wind.
• Proper ventilation. A balanced intake/exhaust system extends shingle life by years. Skipping it voids most manufacturer warranties.
• Flashing. Reusing old step flashing or skipping kickout flashing is invisible from the ground — and the #1 cause of sidewall leaks.
• Tear-off vs. layover. A second layer over an existing roof saves a day of labor and disposal fees, but cuts the new roof's life in half and traps moisture.
• Workmanship warranty. A 1-year handshake vs. a written 5-year workmanship warranty is a huge difference in actual coverage.

The real cost math

A $14,000 roof that lasts 12 years costs you ~$1,170/year. A $19,000 roof installed correctly that lasts 28 years costs you ~$680/year. The "expensive" roof is 40% cheaper over its life — and you only deal with the disruption once.

Questions to ask every bidder

1. Is this tear-off or layover?
2. How many courses of ice & water shield, and where?
3. What underlayment brand and weight?
4. What is your written workmanship warranty?
5. Who registers the manufacturer warranty?

If the lowest bidder can't answer those clearly, you've found your answer.