Asphalt Shingle Portland
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ASPHALT SHINGLE REPLACEMENT

Asphalt shingle roof replacement, built for Portland

Tear-off, deck inspection, ice-and-water shield, synthetic underlayment, architectural shingles, ridge vent. CCB-licensed Portland crews with manufacturer credentials.

$9,500-$22,000Typical Range
5-7 DaysInstall Time
25-50 YearsMaterial Life
Free · No Obligation · 48h Response

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Asphalt shingle replacement is the dominant roofing decision in the Portland metro because 70-80 percent of residential roofs are asphalt. This pillar covers what a complete replacement should include in Portland's wet-season climate, what drives cost variance between $9,500 and $22,000, and how to evaluate quotes from brand-credentialed installers (GAF Master Elite, Owens Corning Platinum, CertainTeed SELECT, IKO ShieldPRO Plus, Malarkey-trained) versus generic CCB licensees.

What a complete replacement should include

Tear-off and deck inspection

Full tear-off down to the sheathing is the Portland standard. Overlay (laying new shingles over old) is permitted by Oregon code in many cases but voids most manufacturer warranties and hides the deck damage that wet PNW winters reveal. A correct tear-off exposes the OSB or plywood sheathing, lets the installer probe for delamination from prior leaks, and gives you a chance to replace any rotten decking before the new system goes on. Plan for $80-$120 per sheet of replacement decking if rot is found.

Ice-and-water shield + synthetic underlayment

Oregon IRC R905.1.2 requires ice barrier coverage in jurisdictions where ice damming is possible. Portland-area installers typically run a 36-inch self-adhered ice-and-water shield up from the eaves and in all valleys, then cover the rest of the deck with synthetic underlayment rated for 90-day UV exposure. The synthetic costs more than felt but resists tearing during the multi-day installs that Portland weather windows often force.

Architectural shingles (the modern default)

3-tab shingles are largely obsolete in new Portland installs. Architectural (also called dimensional or laminated) shingles are the modern default: heavier, longer-warrantied, more wind-resistant, and visually more refined. GAF Timberline HDZ, Owens Corning TruDefinition Duration, and CertainTeed Landmark are the three highest-volume architectural lines in the Portland market. Premium designer lines (Camelot II, Berkshire, Presidential Shake) cost 40-60 percent more and add visual depth that suits Eastmoreland/Laurelhurst heritage homes.

Ridge vent + balanced attic ventilation

Ridge venting is the second-most-skipped detail after ice shield. Without continuous ridge venting and matching soffit intake, attic moisture in Portland's wet season condenses on the underside of the deck and shortens shingle life. A correct replacement includes cutting back the ridge, installing a continuous ridge vent (Cobra, ShingleVent II) and verifying soffit baffles are clear. Add $400-$900 to the project for a complete ventilation rework if the existing system is undersized.

Flashing rebuild

Step flashing at sidewalls, headwall flashing at the house-to-roof transition, and valley flashing all get replaced during a full tear-off. Reusing old flashing is a red flag in any quote; lead and aluminum step flashings cost $4-$12 per linear foot installed and a typical Portland house has 80-160 linear feet of step flashing alone.

Edge cases that change the project

Specific situations that push pricing or scope outside the typical range

Two layers of existing shingles

Oregon code allows up to two layers of asphalt shingles in most jurisdictions, but a third overlay is prohibited. If your home has two layers, replacement requires a full tear-off, which adds $1,200-$2,800 to the project for the extra labor and dump fees (typically $90-$140 per ton at Portland transfer stations).

Severe moss / cyanobacteria damage

Heavily mossed roofs (Forest Park orbit, Eastmoreland heritage, Council Crest deep streets) often have north-facing slopes where the moss has lifted shingle tabs and accelerated granule loss. The shingles need to come off cleanly so the deck can be inspected; expect the tear-off labor to run 15-25 percent higher than a south-facing roof of the same square footage.

Skylights, sun tunnels, or chimneys

Each penetration adds flashing complexity. Skylight reflashing during replacement runs $250-$500 per skylight; a brick or stone chimney with proper counterflashing adds $400-$1,200; a metal stovepipe chase is the simplest at $150-$300.

Steep pitch (above 9:12)

Portland's West Hills and Council Crest neighborhoods have substantial steep-pitch inventory. Pitches above 9:12 require fall-arrest setup that adds 10-20 percent to labor; pitches above 12:12 (a 45-degree slope) add 25-40 percent and may require specialized roof brackets or scaffolding.

Solar array present

Existing solar panels must be detached, stored, and reinstalled by an electrical contractor coordinated with the roofer. The detach/reset usually costs $200-$400 per panel depending on the installing solar company; budget $1,800-$5,000 on top of the roof itself for typical 8-20 panel systems.

Worked Portland examples

Real-world pricing with the line-item breakdown

1,800 sq ft ranch — Beaverton

$11,400

Single-story ranch, 6:12 pitch, asphalt 3-tab original (1998), single layer, no skylights, no solar, basic ridge venting present but undersized.

  • Tear-off (1 layer) + dump: $1,800
  • Architectural shingles (GAF Timberline HDZ Charcoal): $4,200
  • Synthetic underlayment + ice shield: $850
  • Step flashing + drip edge + ridge vent rework: $1,650
  • Decking replacement (3 sheets, found during tear-off): $360
  • Labor (3-person crew, 3 days): $2,540

2,400 sq ft two-story — Hillsboro

$17,200

Two-story colonial, 8:12 pitch, asphalt architectural shingles (2002), two skylights, brick chimney, no solar, north-facing slope has significant moss damage.

  • Tear-off (1 layer) + dump: $2,400
  • Architectural shingles (Owens Corning TruDefinition Duration): $5,900
  • Synthetic underlayment + ice shield (extended for moss slope): $1,200
  • Skylight reflashing × 2: $700
  • Chimney counterflashing rebuild: $850
  • Full flashing rebuild (step + valley): $1,800
  • Labor (4-person crew, 4 days): $4,350

3,100 sq ft steep-pitch — West Hills

$24,800

Two-story 1940 Craftsman, 12:12 pitch, asphalt 3-tab (2007) with two layers, three skylights, brick chimney, multiple gables and valleys.

  • Tear-off (2 layers) + dump: $4,200
  • Premium architectural (CertainTeed Landmark Pro): $7,800
  • Synthetic underlayment + extended ice shield: $1,400
  • Skylight reflashing × 3: $1,050
  • Chimney counterflashing rebuild: $1,000
  • Full flashing rebuild + valley metal: $2,200
  • Steep-pitch labor premium (12:12 fall-arrest): $1,950
  • Labor (4-person crew, 5 days): $5,200

Replacement pricing reference (Portland metro, 2026)

ItemRange
Architectural shingle (30-year)$3.5 - $5.2
Architectural shingle (50-year / premium)$4.8 - $7.2
Designer / luxury shingle$6.5 - $11.5
Tear-off (single layer)$1 - $1.8
Tear-off (two layers)$1.8 - $2.8
Decking replacement$80 - $120
Ice-and-water shield (eaves + valleys)$1.4 - $2.2
Step flashing rebuild$4 - $12
Skylight reflashing$250 - $500
Chimney counterflashing$400 - $1,200
Ridge vent install (continuous)$8 - $14
Steep pitch premium (above 9:12)$10 - $25
Solar detach + reset$200 - $400

Oregon and Portland regulatory context

Oregon CCB licensing

Every contractor performing roofing work in Oregon must hold an active Construction Contractors Board (CCB) license. Verify the license at search.ccb.state.or.us before signing anything. A valid CCB number does not by itself confirm asphalt shingle expertise; combine it with manufacturer credentials (GAF Master Elite, Owens Corning Platinum Preferred, CertainTeed SELECT, IKO ShieldPRO Plus) for actual installation competency signals.

Portland BDS permits

Roof replacement in the city of Portland requires a building permit through the Bureau of Development Services. Tear-off and re-roof typically falls under a Reroof Permit (online application, $190-$340 depending on roof area). Permit pulling is the contractor's responsibility; if a quote omits permit costs, treat that as a red flag rather than a savings.

Oregon IRC R905 shingle code

Oregon Residential Specialty Code section R905.2 governs asphalt shingle installation: slope requirements (minimum 2:12 with double underlayment, standard install at 4:12 and above), wind rating (minimum Class F per ASTM D3161, Class H upgrade common for premium lines), and underlayment requirements (synthetic equivalent to ASTM D4869 Type I or II is standard).

Manufacturer warranty registration

Most manufacturer warranties require registration within 30-60 days of installation to be valid. GAF System Plus, Owens Corning Platinum Protection, and CertainTeed SureStart Plus all require the installer to register the roof with the manufacturer (proof of shingle plus accessory components like ridge cap, underlayment, ice shield, ventilation). Ask your installer to provide the registration confirmation in writing.

Shingle brands for this service

All five major asphalt manufacturers are installed by network contractors

GAFOwens CorningCertainTeedIKOMalarkey

Portland neighborhoods we cover

Local cost data and install considerations per neighborhood

West HillsNE AlamedaEastmorelandHillsboroBeavertonLake OswegoTigardGresham

Replacement FAQ

What's the average cost of an asphalt shingle replacement in Portland?+
Typical Portland-metro asphalt replacement on a 1,800-2,400 sq ft home runs $11,000-$17,000 with architectural shingles, single layer tear-off, and standard flashing rebuild. Premium architectural or designer lines push to $18,000-$24,000. Heavy-canopy neighborhoods with steep pitches (West Hills, Council Crest) add 15-30 percent because access and pitch labor compound.
Is tear-off worth it or should I overlay?+
Tear-off is almost always worth it in Portland. Overlay (laying new shingles over old) is legal for the first additional layer but voids most manufacturer warranties, hides deck damage from prior leaks, and shortens the new roof's effective life by 20-30 percent because the underlying layer holds moisture against the deck. The exception is a very young first-layer roof (under 8 years) in excellent condition where the owner is short on budget and accepts the reduced warranty.
How long should an asphalt shingle roof last in Portland?+
Architectural shingles installed with full system components (ice shield, ridge venting, balanced intake) typically deliver 22-30 years of useful life in Portland's climate. Premium architectural and designer lines stretch to 28-35 years. The biggest variable is attic ventilation: undervented attics in moss-prone neighborhoods can cut shingle life by 30-40 percent because of underside moisture damage.
What manufacturer should I choose?+
All five major manufacturers in our coverage (GAF, Owens Corning, CertainTeed, IKO, Malarkey) make asphalt shingles that perform well in the Portland climate when installed correctly. The bigger lever is the installer credential. A GAF Master Elite installer running Timberline HDZ generally produces a better roof than a non-credentialed installer running a premium product, because system installation (flashing, ventilation, registration) is where roofs fail, not shingle quality.
How long does the install take?+
A 1,800-2,400 sq ft single-story replacement is typically a 2-3 day job in dry weather. Two-story or steep-pitch homes run 3-5 days. Multi-gable or complex valley roofs in West Hills/Council Crest run 5-7 days. The Portland weather constraint matters: many crews refuse to start a tear-off without a 3-day clear-weather window because exposing the deck in rain damages decking.