Cost & Buying
What's Included in a Roof Replacement — and What's Usually Extra?
The short answer
A complete roof replacement includes full tear-off, disposal, permits, new underlayment, ice-and-water membrane, flashing, drip edge, ventilation, and a workmanship warranty. Legitimate extras are decking replacement (priced per sheet), skylights, and structural or code upgrades revealed at tear-off. A bid that's missing the standard scope isn't cheaper — it's doing less.
Part of our guide to What a Roof Replacement Actually Costs in Washington & Oregon (2026).
The single hardest thing about buying a roof is that you can’t see most of what you’re paying for. Two bids can both say “new roof” and describe completely different amounts of work. Here’s everything a complete replacement should include — and the handful of things that legitimately cost more — so a bid stops being a mystery.
What a complete replacement includes
These belong in every full replacement. If they’re not on the bid, they’re not necessarily in the price:
| Item | Why it’s not optional |
|---|---|
| Full tear-off & disposal | Down to the deck, so nothing rotten gets buried; hauled away |
| Permit | Required for a replacement in most WA/OR jurisdictions |
| Synthetic underlayment | The secondary water barrier over the whole deck |
| Ice & water membrane | Self-sealing protection at eaves and valleys |
| Drip edge | New metal edge that steers water into the gutter |
| Starter strip | Manufactured starter that seals the first course |
| Field shingles | The visible roof — brand and line named |
| Flashing | New wall, chimney, step, and valley flashing (not reused) |
| Pipe boots | New seals at every plumbing penetration |
| Ridge cap & ventilation | Manufactured cap plus balanced intake/exhaust |
| Cleanup & nail sweep | Full cleanup with a magnetic sweep for nails |
| Workmanship warranty | Written coverage on the installation itself |
That’s the baseline. A price far below the market range usually means one or more of these lines is missing — reused flashing, no ice-and-water, cut 3-tab as ridge cap, or no ventilation. Compare bids line by line and the gaps show up fast.
What’s legitimately extra
These aren’t padding — they’re real work that not every roof needs, which is why good bids price them separately and clearly:
- Decking replacement. Rotten plywood can’t be seen until tear-off. It should be priced per sheet up front so you know the number before it’s found.
- Skylights. Reflashing an old skylight, or replacing one during the reroof (almost always the right call if it’s aged — the labor is already there).
- Structural or chimney repairs. Occasionally tear-off reveals framing or masonry issues that have to be addressed.
- Code upgrades. A jurisdiction may require a detail your old roof predates.
- Premium materials. Upgrading from architectural asphalt to metal, designer, or cedar — a material choice, not a hidden cost. See what a roof actually costs.
The honest-contractor test
A bid you can trust does three things: it lists the standard scope above so you can see it’s all there, it prices the real variables (decking) per unit in advance, and it states its exclusions plainly instead of hiding them. That’s the whole difference between a fixed, line-item bid and a number that grows teeth halfway through the job.
Want to see exactly what your roof needs, itemized? Book a free inspection for a fixed, line-item bid — or run the cost calculator for an instant range first.