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Cost Guides
What construction costs in 2026
Published regional averages for the Puget Sound — the same numbers lenders and appraisers use to sanity-check a project. Not our quote: our quotes come free, itemized, after a real conversation.
Puget Sound construction costs in 2026: custom homes $250–$450/sq ft, detached ADUs $300–$500/sq ft, commercial tenant improvements $120–$250/sq ft, ground-up commercial $200–$400/sq ft, multifamily $220–$350/sq ft, remodels $150–$350/sq ft. Seattle runs ~12% above the Everett baseline; Marysville ~3% below.
| Project Type | Cost Range / sq ft | Notes |
|---|---|---|
| Custom home | $250–$450 | Design complexity and finishes drive the range |
| Detached ADU (DADU) | $300–$500 | Small footprint = higher per-sq-ft systems cost |
| ADU conversion | $150–$300 | Existing structure reduces shell cost |
| Commercial TI | $120–$250 | Office/retail; food service trends higher |
| Ground-up commercial | $200–$400 | Shell + TI; site work varies widely |
| Multifamily | $220–$350 | Per unit sq ft; economies at scale |
| Home remodel | $150–$350 | Kitchens and baths skew higher |
Deep Dives
Guides by project type
01Custom Home Costs
Line-item budget structure, finish tiers and timeline for custom homes.
Learn more →02Commercial Construction CostsTI vs remodel vs ground-up — how commercial budgets are actually built.
Learn more →03ADU CostsEvery ADU type priced: conversions, attached, detached cottages.
Learn more →04Instant EstimateOur static calculator: type, size, city → planning range in seconds.
Learn more →All figures are averaged 2026 regional planning data — not ABM Construction pricing. Last verified: January 2026. Exact quotes are always free and itemized.
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