Roof Replacement in Portland, OR
A full reroof takes the old roofing off to the deck, fixes what is underneath and builds the roof back up in layers. Here is what that involves around Portland and what to look for in a bid.
What does roof replacement in Portland involve?
Roof replacement means taking the existing roof off and building a new one on the same deck. In the Portland area the usual sequence is:
- Tear-off. Old shingles and underlayment come off down to the wood deck (the sheathing) and go into a dump trailer.
- Deck repair. Any sheathing that is soft, delaminated or rotted is cut out and replaced. This is the part nobody can price exactly in advance.
- Underlayment. A synthetic or felt layer covers the deck, with a self-adhered membrane in the valleys and at other places water concentrates.
- Metal. Drip edge at the eaves and rakes, valley metal, step flashing where the roof meets a wall, and new boots on the plumbing vents.
- Roofing. Composition shingles are the common choice here; architectural (laminated) shingles have largely replaced flat 3-tab. Algae-resistant (AR) shingles are widely sold in this climate.
- Ridge and ventilation. Ridge caps, and usually a ridge vent so the attic can breathe.
A straightforward house is typically a matter of days once the crew starts. Weather, deck repairs and a cut-up roof stretch that.
Why do older Portland houses cost more to reroof?
Many of the city’s older houses were first roofed in wood shakes or shingles nailed to spaced boards with gaps between them. The residential code calls for a solidly sheathed deck under asphalt shingles, so when one of those roofs is torn off, new plywood or OSB goes over the whole thing before anything else. Houses that have been recovered once already also have two layers to remove.
If your roofline dips or the ridge is not straight, read the sagging roof page before you collect bids: that is a framing or deck question as well as a roofing one.
What should the bid itemize?
- The number of squares, and whether it is a tear-off or a recover
- A per-sheet price for replacing bad sheathing
- Underlayment type, and where self-adhered membrane goes
- Which flashing is new and which is reused
- Shingle manufacturer and product line
- Ventilation changes, if any
- Who handles the permit if one is needed
- The contractor’s CCB number
The roof cost page gives published price ranges and explains why they differ. If you are weighing shingles against panels, see metal roofing; for low-slope sections of the same house, flat roofing. And if the roof has years left in it apart from one leak, a repair may be the right job.
What this typically costs
| Work | Typical range | Basis | Source |
|---|---|---|---|
| Roof replacement, OregonState average modeled from material cost data on a moderately pitched roof. Not specific to Portland. | $5,639 - $18,173 | per roof, Oregon statewide range | This Old House, Roof Replacement Cost in Oregon (thisoldhouse.com), updated June 8, 2026checked September 30, 2026 |
| Roof replacement, nationalCustomer-reported project costs across the country, all materials and roof sizes. | $5,902 - $13,377 | per roof, typical national range | HomeAdvisor, How Much Does a Roof Replacement Cost (homeadvisor.com), updated June 17, 2026checked September 30, 2026 |
| Tear-off and disposalThe removal portion of a replacement. More layers and steeper pitch push it up. | $1,500 - $4,500 | per roof, national, permit not included | HomeAdvisor, How Much Does a Roof Replacement Cost (homeadvisor.com), updated June 17, 2026checked September 30, 2026 |
| Asphalt shingle replacement, Pacific regionOne standard project priced by region, a full tear-off on a large house. It sits far above the averages because of that fixed scope. | $36,391 | per job, regional average for a fixed project specification | JLC / Zonda, 2025 Cost vs. Value Report, Pacific region (jlconline.com)checked September 30, 2026 |
| Metal roof replacement, Pacific regionSame report and method as the asphalt row, with metal in place of shingles. | $62,152 | per job, regional average for a fixed project specification | JLC / Zonda, 2025 Cost vs. Value Report, Pacific region (jlconline.com)checked September 30, 2026 |
| Roof repairCustomer-reported costs for repairs of all kinds. | $395 - $1,967 | per repair, typical national range | HomeAdvisor, How Much Does Roof Repair Cost (homeadvisor.com), updated June 19, 2026checked September 30, 2026 |
| Roof leak repair | $360 - $1,550 | per repair, national | HomeAdvisor, How Much Does Roof Repair Cost (homeadvisor.com), updated June 19, 2026checked September 30, 2026 |
| Flashing repair | $200 - $500 | per repair, national | HomeAdvisor, How Much Does Roof Repair Cost (homeadvisor.com), updated June 19, 2026checked September 30, 2026 |
Prices on this page are general ranges gathered from published sources, not a quote. What a job actually costs depends on the specifics of the job and who does the work. Only a quote from a qualified contractor who has seen the job is a real price. Last reviewed September 30, 2026.
How it works
Describe the roof
Enter the ZIP code, pick the kind of work, and say what you are seeing: a leak, wind damage, an old roof, or a quote you want to compare.
Your request goes to a roofer
We pass it to an independent, CCB-licensed roofing contractor who works in your part of the metro. We do no roofing ourselves.
The roofer inspects and bids
The contractor contacts you directly, looks at the roof and gives you a written bid with their own price and scope.
You look up the license and decide
Check the CCB number on the bid, compare it with any other bids you have, and hire them or not. There is no obligation.
Signs it is time to call someone
A dip in the roof plane or a ridge line that is no longer straight
A sag is a structure or deck problem, not a shingle problem. It can be sheathing that has stayed wet and softened, rafters that are undersized or cracked, or more weight on the frame than it was built for, such as several layers of roofing.
Shingles or tabs in the yard, or bare patches on the roof after wind
Shingles are held by nails and by a strip of sealant that bonds each course to the one below. When that bond has aged out or never set, wind lifts the tab, creases it and eventually tears it off, leaving underlayment or nail heads exposed.
Sandy grit collecting in the gutters and at the downspouts
The mineral granules on a composition shingle shield the asphalt from sunlight. Some shedding is normal on a new roof. Steady loss on an older roof, with dark or shiny patches showing, means the asphalt is exposed and the shingle is near the end of its service life.
Shingle edges turning up or tabs cupping across the roof
Shingles curl as the asphalt dries out with age, and sooner when a hot, poorly ventilated attic bakes them from below. Curled tabs catch wind and no longer shed water onto the course beneath, so the pattern usually points to replacement, not patching.
Tear-off or recover?
| Attribute | Tear-off | Recover |
|---|---|---|
| What happens to the old roof | Removed down to the deck and hauled away | Left in place under the new shingles |
| Deck inspection | The whole deck is visible and soft sheathing gets replaced | The deck stays hidden |
| Flashing | Can be replaced throughout | Mostly reused or worked around |
| Weight on the frame | One layer | Two layers |
| Up-front cost | Higher because of removal and disposal | Lower |
| When it is ruled out | Rarely | When the code or the shingle maker does not allow another layer, or the old roof is wet, curled or uneven |
Request a Roofing Quote
Tell us about your roof and we pass your request to a local, CCB-licensed roofing contractor who can quote the work.
Common questions
How long does a roof last in Portland?
It depends on the material, the installation and how much shade and debris the roof sits under, so no single number is honest. A shingle warranty is not a lifespan. Judge the roof by its condition - curling tabs, bare patches where granules have worn off, repeated leaks - and have a roofer look once it shows those signs.
Do I need a permit to replace my roof in Portland?
Usually not. The City of Portland lists reroofing a house with material of similar weight, including replacing sheathing, as work that needs no building permit. Reroofing in a Wildfire Zone or on a townhouse does need one.
Can new shingles go over my old ones?
Sometimes. The residential code and the shingle manufacturer's instructions both limit when a recover is allowed, and it is ruled out when the existing roof is wet or badly curled. Ask the contractor to state in the bid whether it is a tear-off or a recover, and why.
What is a square?
One hundred square feet of roof surface. Roofing bids are priced by the square, so the number of squares on the bid should be close from one contractor to the next.
Does moss mean I need a new roof?
Not by itself. Oregon State University Extension notes that moss holds water against the roof and can lift shingle edges, so a roof that has carried heavy moss for years may be worn underneath. A roofer can tell you whether the shingles are still sound.
Request a Roofing Quote
Tell us about your roof and we pass your request to a local, CCB-licensed roofing contractor who can quote the work.
Learn more
Related services
Roof Repair
Leak tracing and spot repairs: replaced shingles, new pipe boots, resealed or rebuilt flashing at chimneys, skylights, walls and valleys.
Metal Roofing
Standing seam and exposed-fastener metal roofs for houses, installed over a prepared deck in place of shingles.
Flat Roofing
Repair and replacement of low-slope roofs in TPO, PVC, EPDM or modified bitumen (torch-down), including seams, drains and edge flashing.