Why the Lowest Price Is Rarely the Cheapest Roof
A roofing estimate that comes in thousands lower than the others usually isn't a better deal — it's a narrower scope. The lower number may omit ice-and-water shield, reuse old flashings, skip the drip edge, or overlay new shingles on top of old instead of tearing off to the bare deck.
Each of those shortcuts saves the contractor money upfront but costs you later: leaks at the eaves, premature failure from trapped moisture, and hidden deck rot that an overlay masks until it's a structural problem.
What to Compare Line by Line
An honest estimate spells out exactly what's included. Here's what to check on every quote:
- Shingle brand, style, and weight — confirm the specific product, not just 'architectural shingles.'
- Underlayment — synthetic (preferred in Western Washington) versus traditional felt, which absorbs moisture.
- Ice-and-water shield — included at the eaves, valleys, and penetrations, not just the minimum felt.
- Drip edge — metal flashing at the roof edge to direct water into the gutter, not behind the fascia.
- Flashing — replacement of valley, chimney, and step flashing versus reusing old metal.
- Ventilation — balanced soffit and ridge ventilation, or just reusing existing.
- Tear-off — removal to the bare deck to inspect and replace any rotted plywood, versus an overlay that hides damage.
- Cleanup and disposal — haul-away of all old materials and jobsite cleanup included.
Warranty: Manufacturer vs. Workmanship
Two warranties come with a roof, and they cover different things. The manufacturer warranty covers defects in the shingle material itself. The workmanship warranty, from the contractor, covers the installation — and that's where most leaks actually originate.
A long manufacturer warranty means little if the shingles were installed incorrectly. Ask what the workmanship warranty covers, for how long, and whether it's transferable to a new owner. A contractor who stands behind their installation will spell this out in writing.
Red Flags and Green Flags in an Estimate
Red flags: a vague one-line quote, pressure to sign the same day, no mention of underlayment or flashing, an overlay without a deck inspection, or a price far below every other estimate. Green flags: a written, itemized scope; a clear explanation of materials and process; a documented deck inspection plan; and a workmanship warranty spelled out in the contract.
The right contractor wants you to understand the scope and compare it honestly. If an estimate can't survive a side-by-side comparison, that tells you something about the roof you'd actually get.
