How Much Does a Roof Replacement Cost in Portland, OR?

If you've started collecting bids for a new roof, you've probably noticed the numbers are all over the place. One contractor says $16,000, another says $28,000, and neither explains why. I'm an estimator, and I price roofs across the Portland metro every week — from Sellwood Craftsman bungalows to Beaverton split-levels to the ranch homes out in Gladstone. This guide lays out what roof replacement actually costs here in 2026, how the math works, and what pushes a job toward the high or low end of the range.

One thing up front: every figure below is a typical Portland-metro planning range, not a quote. Your roof has its own pitch, access, layer count, and history, and those move the number. When you're ready for a real figure, our instant roof estimate tool will give you a ballpark in about a minute, and a free in-home consultation gives you an itemized proposal you can compare line by line.

Typical roof replacement cost ranges in Portland (2026)

Roofing is priced by the square — 100 square feet of roof surface — and our installed ranges below include tearing off one existing layer, disposing of it, and rebuilding the full waterproofing system: underlayment, ice-and-water shield at the eaves and valleys, drip edge, flashing, and ventilation. Here's where typical Portland-metro projects land per square, installed:

Most of what we install is GAF architectural shingles, and for good reason: they carry strong wind ratings, they're warranted by North America's largest roofing manufacturer, and they're the best cost-to-lifespan value in our climate. Cedar is beautiful and historically correct on some older Portland homes, but under our moss and forty inches of annual rain it demands real maintenance to reach its full lifespan.

To put the per-square numbers in whole-house terms: a straightforward 20-square roof (common for a mid-century ranch) in architectural shingles typically runs $14,000 to $24,000 installed. That spread is real, and the next sections explain exactly where it comes from. If you want to see what your specific roof shape does to those numbers before you call anyone, run it through the instant estimator — it uses the same rates we build proposals from. You can also read about everything that goes into a Cornerstone roof replacement, from tear-off to final magnetic sweep.

How per-square pricing actually works

The single biggest source of confusion in roofing bids is the square. Homeowners measure their house — say, 1,800 square feet of living space — and then wonder why the estimate says 24 squares. Two reasons. First, roof area includes overhangs, garages, and porches. Second, and bigger, is pitch: a sloped surface covers more area than the flat footprint beneath it. A moderately pitched roof has roughly 15 to 25 percent more surface than its footprint; a steep one can have 40 percent more.

So the math runs like this. Take the roof's measured surface area, divide by 100 to get squares, then multiply by the per-square installed rate. On a 24-square roof at $700 to $1,200 per square for architectural shingles, you're looking at $16,800 to $28,800 before adjustments. Those adjustments matter: steeper roofs cost more per square because the crew moves slower and safety rigging takes time, and a two- or three-story home adds staging and ladder work. When we estimate, we measure from the air with aerial measurement tools and then verify on site, so the square count in your proposal is the roof you actually have, not a guess from the driveway.

Tear-off vs. overlay: why we almost always tear off

An overlay — nailing new shingles over the old ones — saves the tear-off labor and disposal cost, which is why the cheapest bid you get will often be an overlay. Here's what that savings buys you in western Oregon: no chance to inspect the decking, new shingles telegraphing every curl and bump of the old layer, extra weight the framing was never designed to carry, and a shorter-lived roof because the bottom layer keeps the whole sandwich warmer and damper. In a climate that stays wet from October to June, trapping a layer of old, moisture-holding material under your new roof is a bad trade.

There's also the warranty angle. Manufacturers structure their strongest warranties around complete systems installed on a clean deck. Every range in this guide assumes a full tear-off of one existing layer — that's how we build every roof, and it's what our roof replacement service includes as standard. If your home already has two layers, tear-off is no longer optional; it has to come down to the sheathing, and the extra removal labor will add to the disposal line item.

What pushes a Portland roof toward the high end

Decking and rafter repair — the cost you can't see from the ground

Nobody can see your decking until the old roof comes off, which is why honest estimates carry a per-sheet or per-linear-foot price for replacement rather than pretending it won't happen. On a recent project in Gladstone, we tore off a tired roof and found cracked rafters hidden under decades of blown-in insulation — the kind of damage that only shows itself mid-tearoff. We sistered new lumber alongside the damaged rafters, re-decked the affected sections, and only then built the new roof system. That repair added cost, but the alternative was nailing a 25-year roof onto a structure that couldn't hold it.

This is common across the metro's older housing stock. Pre-war homes in Irvington and Sellwood often have skip sheathing under original cedar shakes that needs a full plywood overlay. Mid-century ranches sometimes show sagging between rafters where decades of leaks softened the deck. Budget a contingency: on homes built before 1980, decking repair of some kind shows up on a meaningful share of our tear-offs.

Pitch, stories, and complexity

A walkable, low-pitch ranch roof is the baseline. Move to a steep Craftsman gable or a three-story Foursquare and labor costs climb — roughly 15 percent for a medium pitch and 30 percent for a steep one, with another 8 to 16 percent for second and third stories. Valleys, dormers, skylights, and chimneys each add detail work: every penetration is custom flashing, and in our climate flashing is where roofs live or die. A roof with six dormers simply costs more per square than a clean gable, even at the same material.

Wind exposure and PNW weather factors

Freeze-thaw gets talked about a lot in roofing, but in the Willamette Valley it's rare — what actually tests a roof here is wind-driven rain and moss. East-metro homes take the brunt of Columbia Gorge outflow; on our Gresham-area roofing projects, we spec shingles and nailing patterns for sustained winter winds that drive rain sideways under laps and ridge caps. Everywhere in the metro, north-facing slopes grow moss, and moss lifts shingle edges and holds moisture against the surface. Zinc or copper strips at the ridge, algae-resistant shingles, and honest conversations about tree trimming are all part of speccing a roof for this climate rather than a generic one.

Timing matters too. We roof year-round, but a November replacement needs dry-window planning, temporary dry-in every night, and sometimes hand-sealing shingle tabs that won't get enough sun to self-seal until spring. That care is built into how we schedule — it's not a surcharge, but it is a reason to be skeptical of a crew promising a one-day tear-off in a week of steady rain.

Permits, disposal, and the line items people forget

A roof replacement in Portland comes with a few costs that don't show up in the per-square rate but belong in any complete proposal. The City of Portland Bureau of Development Services charges permit fees for roofing work, and structural repairs like the Gladstone rafter job trigger a building permit and inspection of their own. Disposal is real money as well: a 20-square tear-off generates several tons of shingle waste, and dump fees in the metro have climbed steadily. Finally, if your gutters are at the end of their life, replacing them while the roof edge is open and the ladders are up is far cheaper than a separate trip later.

• Permit fees — vary by jurisdiction and scope; structural repair adds its own permit and inspection
• Tear-off and disposal of the old roof — several tons of debris on an average home
• Decking and rafter repair — priced per sheet or per linear foot once the roof is open
• Flashing, pipe boots, and ventilation upgrades — small line items, huge leak protection
• Gutters and downspouts — cheapest to replace while the roof edge is already open

Choosing materials with confidence

Cost is only half the decision — you also have to live with how the roof looks from your street for the next three decades. Shingle color reads very differently under gray Portland skies than it does on a sample board in a showroom, and the roof is a third or more of what people see when they look at your house. Before you commit, preview real shingle colors and profiles on a photo of your actual home with RoofVision, our roof visualization tool. It's the same step we walk through in consultations, and it takes the guesswork out of the one decision you can't undo cheaply.

How to get a number you can trust

Start with the instant estimate to frame the conversation, then get two or three in-home proposals from licensed Oregon contractors — and check the CCB number, every time (ours is #261422). Compare scope, not just price: tear-off included or not, decking repair priced how, what underlayment, what warranty, who's responsible for the permit. The cheapest number on the table is usually the one missing the most line items. If you'd like our proposal in that stack, call (503) 502-5613 or book a free consultation — we'll measure, walk the roof, and hand you an itemized number that means what it says.