Standing Seam Metal Roofing Cost in Washington
Real installed pricing for the Seattle metro, what actually moves the number, and how metal pencils out against asphalt over the long run in a wet, moss-heavy climate.
Cost per square foot by system
Ranges below are installed prices in King and Snohomish County, including tear-off of one existing layer, underlayment, flashings, and cleanup. They are planning numbers — the only accurate price comes from measuring your roof.
| System | Installed range | Notes |
|---|---|---|
| Exposed-fastener metal panel | $9 – $13 / sq ft | Budget metal. Screws penetrate the panel face and their gaskets need attention every 10–15 years. |
| Snap-lock standing seam (26GA steel) | $15 – $21 / sq ft | The common residential choice. Concealed clips, Kynar 500 / PVDF finish, no fasteners through the panel. |
| Mechanically seamed standing seam (24GA steel) | $19 – $27 / sq ft | For low pitch, long panel runs, and exposed sites. Seams are field-crimped closed. |
| Aluminum standing seam | $22 – $32 / sq ft | Worth the premium near salt air; will not rust at cut edges. |
Want a number for your own square footage? Use the roof cost calculator.
What drives the price
Roof complexity
Every valley, dormer, skylight, and chimney means custom-bent flashing and hand work. A simple gable roof can price 25–35% below a cut-up roof of the same square footage.
Pitch and access
Above roughly 7/12 the crew needs staging and fall protection, and panel handling slows down. Tight lots and long carries add labor too.
Tear-off and decking
Removing one layer of asphalt is routine. Rotten sheathing, common on older Snohomish County homes with past leaks, is replaced per sheet at a rate disclosed before we start.
Gauge, profile, and finish
24GA costs more than 26GA, mechanical seam more than snap-lock, and specialty or matte PVDF colors carry an upcharge over standard stock colors.
Underlayment package
High-temp ice & water shield at eaves, valleys, and penetrations plus synthetic across the field is the assembly we quote. It is not the place to save money under a 50-year roof.
Ventilation and trim
Ridge vent, intake correction, matching gutters, snow retention, and solar or skylight reflashing are line items that vary house to house.
Long-term value in the Northwest
Cost per year is the honest comparison. A $38,000 standing seam roof expected to run 50 years works out to roughly $760 a year. A $19,000 architectural asphalt roof that realistically reaches 25 years here — shaded, damp, and under constant moss pressure — is about $760 a year too, and that is before the second tear-off, the second permit, and a decade of moss treatments in between.
Metal wins on the things this climate punishes: it sheds debris instead of holding it, it does not lose granules, and its fasteners are concealed where rain cannot work at them. That is why we recommend it on exposed, hard-to-access, or long-hold homes — and say so plainly when asphalt is the better buy instead.
Metal roofing cost FAQs
How much does a standing seam metal roof cost on an average Seattle-area home?
For a typical 2,000 sq ft single-story roof with moderate complexity, most snap-lock standing seam projects in King and Snohomish County land between $32,000 and $45,000 installed, including tear-off, underlayment, and flashings. Simple ranch roofs come in lower; steep, cut-up roofs come in higher.
Is standing seam metal worth it compared to asphalt shingles?
Over one roof cycle, asphalt is cheaper. Over 40 years it usually is not. A quality architectural asphalt roof in the Pacific Northwest realistically runs 20–30 years with moss pressure, so you buy it twice. Standing seam commonly outlasts the underlayment beneath it and sheds moss and debris instead of holding it.
Why does metal roofing cost more in the Pacific Northwest?
Wet, shaded, moss-prone conditions mean the underlayment and flashing package matters more here, and our roofs tend to have more valleys and dormers than in drier regions. Both add labor rather than material.
Can metal be installed over an existing shingle roof?
It is sometimes physically possible, but we do not recommend it. Going over shingles hides rotten decking and creates an uneven plane that telegraphs through the panels. We tear off and inspect the deck first.
Does a metal roof lower my homeowners insurance?
Often yes. Class A fire resistance and high wind ratings qualify for discounts with many Washington carriers. Ask your agent what documentation they need — we provide the product data sheets.
Is a metal roof loud in the rain?
No. A standing seam roof over solid decking, underlayment, and an insulated attic is not measurably louder inside than asphalt. The noise reputation comes from bare metal over open purlins on barns.
Get an exact number for your roof
We measure on site, show you panel and color samples, and hand you a written, itemized price. No pressure.