Roof replacement & installation in Portland, OR.
GAF-certified roof replacement built for forty-plus inches of Pacific Northwest rain. Premium shingles, certified installation, manufacturer-backed warranties.
What's included in a Cornerstone roof replacement?
Every roof we install is a complete system, not just shingles. We start with a full tear-off, inspect the decking, and rebuild the waterproofing from the sheathing up, so the roof you see is backed by layers of protection you don't.
- →Full tear-off and decking inspection
- →Ice-and-water shield at eaves, valleys, and penetrations
- →Synthetic underlayment and drip edge throughout
- →GAF architectural shingles installed to manufacturer spec
- →New flashing, pipe boots, and balanced attic ventilation
- →Daily site cleanup and a final magnetic sweep
Why GAF shingles for a Portland roof?
Cornerstone partners with GAF, North America's largest roofing manufacturer, because their shingles are engineered for exactly what our climate dishes out: months of steady rain, freeze-thaw cycles, and the moss that loves a north-facing Portland roofline.
Manufacturer training isn't a marketing line. It's what qualifies your roof for GAF's strongest available warranties, and it's why our installs pass inspection the first time.
Preview it in RoofVision first →Get an instant ballpark →What warranty do I get?
Every Cornerstone roof is backed by manufacturer warranties on materials plus our own written workmanship guarantee. If something we installed isn't right, we come back and make it right. That's the job.
All services →Common roofing questions
How much does a new roof cost in Portland?
Our current Portland estimate bands run $700 to $1,200 per square installed for GAF architectural shingles, with tear-off of one layer included. On a typical 20-square, one-story, medium-pitch roof that works out to $16,100 to $27,600. Pitch, stories, and decking repair move the number, and your itemized proposal is the one you can plan on.
Do I need a permit to replace my roof in Portland?
Usually not. Portland exempts reroofing with a material of similar weight on one- and two-family homes, and that exemption even covers replacing the roof sheathing. A permit comes into play when the new material is heavier or the structure changes, and when one is needed, we pull it under our CCB number, not yours.
How long does a roof replacement take?
Most Portland-metro homes take two to four working days from tear-off to final cleanup. A simple single-story ranch with a sound deck can be done in a day or two; steep pitches, dormers, or deck repairs add time. We never leave a roof open to rain, so a wet forecast can pause the schedule.
What warranty do I get on a roof replacement?
Every Cornerstone roof is backed by manufacturer warranties on materials plus our own written workmanship guarantee. Our manufacturer training is what qualifies your roof for GAF's strongest available warranties, and if something we installed is not right, we come back and make it right.
Related reading.
RoofingWhat Makes a Roofing Contractor the Right Fit in PortlandChoosing a roofing contractor in Portland, Oregon? Here is what to check before you sign: CCB licensing, GAF certification, who is on the crew, and warranties.October 13, 2026
RoofingHow to Read Roofing Contractor Reviews in Portland, OregonStar ratings only tell you so much. Here is how to read roofing contractor reviews in Portland, Oregon and spot the details that predict a smooth roof job.September 29, 2026Cost GuidesRoof Replacement Cost in Portland, OR (2026 Guide)Roof replacement cost in Portland, OR explained by a local estimator: real ranges by material, per-square math, tear-off vs. overlay, and what drives price.August 4, 2026Ready to talk about your roofing project?
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