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How much does a adu new cost in Seattle (98115)?

Typical adu new in Seattle (98115)
≈ $196,000
medium confidencefrom 245 filings
≈ $125,000median ≈ $196,000≈ $377,000
A reference range from comparable filed projects in public records — not a quote.
Honesty is the point. We show the full range and the sample size — a reference, never a single promised number.
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Adu new projects filed in Seattle (98115) typically run about $196,000, with most between $125,000 and $377,000, based on 245 filings (Seattle public records, DataSF).

These are comparable filed projects in Seattle (98115) — a typical reference range, not a quote. Your project can land anywhere in the spread depending on scope, materials, and access.

Where the money goes

A typical share of a adu new budget — an illustrative industry breakdown, not measured for this project.

What moves the price

Materials & finishes
The biggest swing — basic vs premium
Labor & crew
Local rates and how many trades are involved
Scope found on-site
Older homes surface surprises once walls open
Filing & timeline
Reviews and inspections add weeks, not just cost

Common questions

What's the typical range for a adu new in Seattle (98115)?

Most adu new projects in Seattle (98115) run $125,000 to $377,000, with a median around $196,000, based on 245 filings of comparable filed work (Seattle public records, DataSF).

How does Seattle (98115) compare to citywide adu new costs?

the 98115 median ($196,000) runs about 19% above the Seattle citywide median ($165,000) for adu new projects.

How recent is this data?

These figures reflect comparable adu new projects filed in Seattle public records (DataSF), compiled as of 2026-06-03. They refresh as new filings are published.

What affects the cost of a adu new?

Scope, materials, finishes, the age and condition of the home, and site access. The spread above ($125,000–$377,000) reflects that range — your project can land anywhere in it.

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