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Seattle, WA Construction Costs 2026

Seattle is the Pacific Northwest's largest metro and a premium landscaping market shaped by two competing forces: a wet Zone 8b maritime climate that saturates soils November through March, and a summer drought that runs July through mid-September. King County salmon-safe requirements and SDCI permit backlogs of 4–6 months add regulatory complexity not found in other West Coast markets. Labor runs $60–$90/hr. English ivy, Himalayan blackberry, and Japanese knotweed invasives must be removed before most plantings can establish. Seattle's proximity to Pacific NW stone quarries (Columbia River basalt, Pacific NW granite) provides access to distinctive regional hardscape materials at 15–25% below imported equivalents. Covered patios are the highest-ROI outdoor investment in Seattle's 7-month outdoor season.

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All Seattle Cost Guides

Detailed cost breakdowns for the most common residential construction projects in Seattle, Washington. Data sourced from RSMeans 2026 benchmarks and local contractor rates.

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Landscape Design
$5,500 – $55,000
Avg: $18,000
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Lawn Installation
$2,200 – $24,000
Avg: $8,000
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Irrigation System
$3,000 – $24,000
Avg: $8,500
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Hardscape & Patio
$5,500 – $58,000
Avg: $16,000
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Tree Removal
$650 – $14,000
Avg: $3,500
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Kitchen Remodel
$16,000 – $110,000
Avg: $48,000
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Bathroom Remodel
$7,000 – $50,000
Avg: $19,000
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Home Addition
$55,000 – $420,000
Avg: $165,000
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Roof Replacement
$8,500 – $34,000
Avg: $16,000
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Deck Building
$6,500 – $48,000
Avg: $20,000
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Window Installation
$5,000 – $38,000
Avg: $16,000
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Frequently Asked Questions

Why are landscaping costs higher in Seattle than the national average?
Seattle landscaping costs run 15–25% above national averages due to high labor rates ($60–$90/hr), invasive species removal requirements (English ivy, Himalayan blackberry), King County salmon-safe design requirements near streams, SDCI permit backlog of 4–6 months for complex sites, and the Pacific NW native plant premium. The dual drainage challenge — saturated soils November–March and summer drought July–August — requires dual-constraint design that adds complexity versus single-season markets.
How do King County salmon-safe requirements affect Seattle landscaping?
King County's salmon-safe requirements apply near salmon-bearing streams throughout the metro. They restrict certain pesticides, require infiltration-based stormwater management, and encourage native plant use. SDCI critical area permits for work near streams add 6–12 weeks to project timelines. Projects near Puget Sound tributaries may require a Landscape Ecology review ($1,500–$4,000). Native plant designs aligned with salmon-safe standards also reduce long-term irrigation and maintenance costs.
When is the best time for landscaping projects in Seattle?
September through November is Seattle's optimal window. Fall installation uses natural rainfall for establishment, eliminates irrigation costs during the 3–4 week rooting period, and coincides with fall nursery availability. For hardscape, April–September offers the driest curing window. For tree removal, October–February provides 15–20% off-peak discounts. Avoid March–May for new planting if possible — it's peak demand season with 4–6 week contractor lead times.
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