Roof Replacement Cost in Seattle, WA (2026)
Roof replacement costs in Seattle vary by material, roof pitch, and how much moss or moisture damage has built up under the surface before a homeowner notices a problem. This guide breaks down 2026 pricing for composition shingle, low-slope, metal, and cedar shake roofs in the Seattle market, along with the local factors, like heavy tree canopy and a narrow dry season, that push a quote toward the high or low end of the range.
By Jason Green · Roofing & Gutters · Published August 13, 2026 · 8 min read
What drives roof replacement pricing in Seattle
Roof size and pitch are the biggest cost drivers, but Seattle adds a few local wrinkles: heavy tree cover in neighborhoods like Wedgwood and Blue Ridge accelerates moss growth and can hide rot in decking that only shows up once old shingles come off, sometimes adding a decking repair allowance to the final invoice.
Steep hillside lots, common in West Seattle and Magnolia, often need extra staging or safety equipment, which adds labor cost compared to a flat suburban lot with easy driveway access.
Composition shingle replacement costs
A standard architectural composition shingle reroof on an average Seattle single-family home, roughly 2,000 square feet of roof area, typically runs $11,000 to $19,000 in 2026, including tear-off, disposal, new underlayment, and flashing.
Roofs with significant existing moss or moisture damage to the decking often run toward the higher end, since damaged plywood or planking has to be replaced sheet by sheet before new underlayment goes down.
Low-slope, metal, and cedar shake costs
Low-slope or flat sections, common on mid-century homes and additions, are typically replaced with torch-down modified bitumen or single-ply membrane, running $8,500 to $16,000 depending on square footage and drain complexity.
Standing seam metal roofing runs $20,000 to $35,000 for a comparable home but sheds moss better than asphalt and typically lasts 40 to 60 years, while cedar shake replacement, still found on many older Seattle homes, runs $16,000 to $28,000 and requires more frequent moss maintenance than other materials.
Permits and inspection steps
Most full roof replacements in Seattle require a permit through SDCI, and homes in a designated historic district may need additional design review if the roofline or visible materials change.
Homeowners outside Seattle city limits, in places like Shoreline, Renton, or unincorporated King County, should confirm permit requirements with that specific jurisdiction rather than assuming Seattle's process applies.
Getting accurate quotes
Ask each roofer for an itemized quote covering tear-off, decking repair allowance, underlayment type, flashing, ice and water shield at eaves and valleys, and disposal, since bundled lump-sum quotes make it harder to compare bids.
Confirm the contractor's registration is active at the Washington L&I contractor lookup tool and ask to see proof of bond and liability insurance before signing anything.
Typical cost ranges
| Roof inspection | $175 - $450 |
| Composition shingle replacement (2,000 sq ft) | $11,000 - $19,000 |
| Torch-down/low-slope roof | $8,500 - $16,000 |
| Standing seam metal roof | $20,000 - $35,000 |
| Cedar shake replacement | $16,000 - $28,000 |
| Decking repair allowance | $600 - $2,200 |
Ranges are general estimates gathered from homeowner-reported quotes, not an offer or a quote for your project.
Common questions
How much does a new roof cost in Seattle in 2026?
A standard composition shingle replacement runs $11,000 to $19,000, while low-slope torch-down sections typically run $8,500 to $16,000.
Do heavily shaded lots cost more to reroof?
Often yes, since moss and moisture damage to decking on shaded lots frequently requires additional plywood or plank replacement before new roofing goes on.
How do I check if my roofer is properly registered in Washington?
Search their name or UBI number at the L&I contractor lookup tool, secure.lni.wa.gov/verify, to confirm active registration, bond, and insurance.
Does a full reroof always require an SDCI permit?
In most cases yes, and homes in a designated historic district may also need design review before work begins.
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