Seattle Siding Replacement Cost Guide 2026: What to Expect

As Marcus Reid, Licensed GC, PMP, writing for Kolmo Construction, I've re-sided everything from 1920s Craftsman bungalows in Wallingford to modern infill homes in Ballard — and the first question is always the same: "What's this going to cost?" In Seattle's wet climate, siding is your home's primary defense against rot and water intrusion, so getting it right matters as much as getting a fair price. This guide gives you real 2026 numbers by material and home size, explains when SDCI actually requires a permit (it's less often than you'd think), and shows you how to avoid the costly mistakes I see most.

Quick Summary & Key Takeaways

• Typical total cost: Most Seattle homes run $18,000 – $60,000 for a full re-side; large or premium projects (cedar, metal, stucco) reach $60,000 – $95,000+.
• Cost per square foot: Expect $13 – $19 per sq ft of wall, installed. Material is only $4.50 – $12/sq ft of that — the rest is tear-off, labor, trim, and house wrap.
• Do you need a permit? Usually no — like-for-like replacement is exempt as ordinary repair. Adding insulation, changing the weather barrier, or structural repairs do trigger an SDCI permit.
• Best value in Seattle: Fiber cement (James Hardie) — durable, fire- and rot-resistant, and one of the highest-resale-value exterior upgrades, recouping roughly 60–88% at sale. Run your own numbers with our Seattle siding cost calculator.

Seattle Siding Cost Per Square Foot by Material (2026)

Siding is priced per square foot of wall area, not floor area — a 2,000 sq ft two-story home often has 2,200–2,800 sq ft of wall to cover. The material itself is only part of the bill; tear-off, house wrap, fasteners, installation labor, and trim make up the rest. Here's how the most common Seattle materials compare, all-in:

"All-in installed" covers tear-off of the old siding, house wrap, fasteners, installation labor, and trim — but not structural repairs, scaffolding for steep lots, or a contingency budget, which I cover below.

Seattle Siding Replacement Cost by Tier and Home Size

Price Tier Matrix (total project, typical Seattle home)

Cost by Home Size and Tier (total project, before contingency)

These ranges reflect Kolmo Construction (Lic# KOLMOL*753JS) pricing at current Seattle labor rates and assume a straightforward re-side. Always add a 15–20% contingency for hidden dry rot — almost a given on older Capitol Hill and Queen Anne homes once the old siding comes off. Run your exact numbers with our Seattle siding cost calculator.

Line-Item Trade Breakdown for a Seattle Re-Side

Here's where the budget actually goes on a typical project:

• Old siding tear-off & disposal: $2,800 – $9,000 (≈ $2/sq ft plus dump fees; higher for stucco or multiple existing layers).
• House wrap, fasteners & accessories: $550 – $2,000 (weather-resistive barrier, flashing tape, starter strips, trim accessories).
• Siding material: $7,000 – $30,000+ ($4.50 – $12/sq ft depending on material and home size).
• Installation labor: $7,000 – $22,000 ($5/sq ft single-story, $6.50/sq ft two-story — the single biggest variable).
• Exterior trim, fascia & soffits: $2,500 – $4,500 (≈ $13.75/linear ft for corners, window/door surrounds, and eave details).
• Flashing & sealants: $800 – $3,000 (metal flashing at every window, door, and penetration — the #1 leak-prevention detail in our rain).
• Structural / dry-rot repair allowance: $1,000 – $10,000+ (only knowable after tear-off; budget for it on any pre-1990 home).
• Scaffolding & access: $1,500 – $5,000 (multi-story homes and the steep lots common across Seattle).
• Exterior paint/finish: $3,000 – $10,000 (only if you choose unfinished siding; factory-finished Hardie skips this).
• Optional continuous exterior insulation: $0.80 – $3.00/sq ft (fiberglass batt up to closed-cell spray foam — cuts heating bills but triggers an energy-code permit; see below).
• Permits & fees (if required): $250 – $1,500 (SDCI Subject-to-Field-Inspection track).
• Contingency: 15–20% of total — non-negotiable on older homes.

Do I Need a Permit to Replace Siding in Seattle?

Usually no — with important exceptions. Like-for-like siding replacement is treated as ordinary repair and is typically exempt under the 2021 IRC (Section R105.2), as administered by the Seattle Department of Construction & Inspections (SDCI). You move into permit territory when the project does more than swap cladding:

• Adding continuous (exterior) insulation — changes the wall assembly and triggers Washington State Energy Code (WSEC) review.
• Changing the weather-resistive barrier (WRB) or adding a rain-screen system that alters the assembly.
• Structural repair — if tear-off reveals rotted sheathing or framing that has to be rebuilt.
• Overlay parcels — homes within a Shoreline zone (within 200 ft of Lake Washington, Lake Union, Puget Sound, the Duwamish, or Green Lake), an Environmentally Critical Area (steep slope, wetland, or stream buffer), a FEMA floodplain, a designated Landmark, or one of Seattle's eight historic districts (Pioneer Square, Ballard Avenue, Columbia City, and others) often need a separate Certificate of Approval or environmental review — independent of any building permit.

When a permit is required, siding usually falls under SDCI's Subject-to-Field-Inspection track: you submit WRB and flashing details, a fastener schedule, and a WSEC continuous-insulation calculation, then pass a WRB/flashing inspection and a final. Skipping a required permit risks stop-work orders and resale headaches — so confirm your parcel's overlays before you start. A good contractor (like Kolmo Construction) checks this for you.

One regional caveat: permit rules are set city by city. Seattle and most King County jurisdictions exempt like-for-like re-siding, but a few do not — notably the City of Everett, which requires a building permit for a full tear-off and re-side even when you reinstall the same material. If your home is outside Seattle, confirm the rule with your local building department before you assume it's exempt.

Signs It's Time to Replace Your Siding

• Rot, soft spots, warping, or cracking — especially below windows and near grade, where Seattle moisture collects.
• Paint that peels or bubbles within a year or two of a fresh coat — a sign the material beneath is no longer shedding water.
• Rising heating bills — failed or absent wall insulation behind old siding lets conditioned air escape.
• Persistent mold, mildew, or moss that won't stay gone — common on north-facing walls in West Seattle and Fremont.
• Carpenter ants or woodpecker damage in wood siding, which signals moisture and decay underneath.
• A tired, dated look dragging down curb appeal — worth addressing before a sale, when siding ROI is highest.

Choosing the Right Siding for a Seattle Home

For most Seattle homes, fiber cement (James Hardie) is the sweet spot: it shrugs off our rain, resists rot and pests, is fire-rated, and comes in factory-finished colors that hold up for 15+ years. Engineered wood (LP SmartSide) gives you a genuine wood look at a lower price point with far less maintenance than the real thing. Natural cedar remains the choice for historic and landmark homes — beautiful, but it needs re-staining every few years. Vinyl is the budget option for rentals, while metal and stucco suit modern and Mediterranean designs respectively.

Whatever you choose, insist on a proper rain-screen detail in our climate — a small ventilation gap behind the cladding that lets the wall dry out, dramatically extending its life. If you're already tearing off siding, it's also the cheapest time you'll ever have to add continuous exterior insulation; the energy savings can qualify for Seattle City Light or PSE efficiency rebates, partially offsetting the upgrade and the permit it requires.

The Kolmo Siding Replacement Process

1. Consultation & material selection — we match siding type, color, and trim to your home's architecture and budget.
2. Transparent, line-item estimate — every cost broken out, no lump-sum mystery numbers.
3. Permit & overlay check — we confirm whether your scope and parcel actually require an SDCI permit and handle filing if so.
4. Material procurement & scheduling — ordered to arrive as the crew mobilizes.
5. Site protection & tear-off — landscaping covered, old siding removed, sheathing inspected.
6. Structural repair & weather barrier — any dry rot fixed, then a new WRB or rain-screen assembly installed.
7. Siding & flashing installation — precise fastening with flashing at every penetration.
8. Trim, finish & final walkthrough — trim and soffits installed, paint applied if needed, site cleaned, and a final quality check with you.

Most Seattle re-sides run 2 to 5 weeks on site, depending on home size, weather, and how much dry rot we find.

Contractor Red Flags to Avoid

• Cash-only deals — a sign of an unlicensed operator avoiding taxes and accountability.
• Waving off permits without checking — siding is often exempt, but a pro still verifies your overlays and scope; "you never need a permit" is a lazy (and sometimes wrong) answer.
• Lowball bids far below the others — usually hide thin material, skipped flashing, or no insurance.
• Door-to-door "storm chasers" pressuring you to sign today — reputable contractors earn work through referrals, not pressure.
• Refusal to show license & insurance — always verify a Washington contractor at lni.wa.gov. Kolmo Construction is fully licensed and insured (Lic# KOLMOL*753JS).

Your Siding Replacement Pre-Project Checklist

1. Define your goal — curb appeal, energy efficiency, durability, or all three.
2. Set a budget with contingency — use our Seattle siding cost calculator and add 15–20% for surprises.
3. Research materials — weigh fiber cement, engineered wood, and cedar for cost, look, and upkeep.
4. Gather inspiration — drive Ravenna and Eastlake for color and trim ideas that fit Seattle architecture.
5. Get 3–4 detailed bids from licensed, insured local contractors and compare scope, not just price.
6. Verify credentials — check each contractor's license and insurance at WA L&I.
7. Confirm permit needs — have your contractor check your parcel's overlays and scope with SDCI.
8. Plan logistics — discuss access, debris disposal, and protecting landscaping before work starts.

Ready to start? Run your numbers at Seattle siding cost calculator, then contact Kolmo at (206) 410-5100 or visit kolmo.io/contact for a free estimate.

— Marcus Reid, Licensed GC, PMP, Kolmo Construction