City program

Pre-Approved ADU Plans in Tumwater, Washington

Browse official and accepted pre-approved ADU plans for Tumwater, Washington. Compare plan size, bedrooms, providers, approval status, official source links, permit requirements, and fees.

Program status: source-backed listings Last checked Aug 12, 2026

Program Overview

This Tumwater page summarizes source-backed pre-approved ADU plan listings for Tumwater, Washington, using official records tied to Cities of Lacey, Olympia, Tumwater, and Yelm and Cities of Olympia, Lacey, and Tumwater. The current public dataset lists 6 accepted plans from 1 provider; provider names include Artisans Group. The accepted listings originate from Olympia, Thurston County, Washington, USA. Plan records cover 480 to 1,000 sq ft and studio to 3 bedrooms where those fields were listed by the source.

Permit and fee context is kept separate from plan acceptance. The public dataset includes 2 permit requirement records and 2 fee records for Tumwater. Permit requirement records include Municipal site review and Plan modification restriction. Fee records include Plan document fee and Permit and site fees. When a source did not publish a value, the page keeps that field as Not listed in source instead of filling a blank.

Use these listings as a starting point for matching a plan to a property. Source links, checked dates, acceptance notes, and provider records are shown so you can verify whether a plan remains accepted locally, what site-specific review remains, and whether local fees, plan licensing, or provider terms apply. A listing in this directory does not guarantee permit approval for a specific parcel.

Summary

Location
Tumwater, Thurston County, Washington, USA
Accepted plans
6 accepted plans
Providers
1 provider
Origin programs
1 program
Plan size range
480 to 1,000 sq ft
Permit sources
2 sources

How to use this page

  1. Pick a plan size and bedroom count.
  2. Check whether the plan originated locally or is accepted from another city/county program.
  3. Open the official source.
  4. Confirm current status with the local building department.
  5. Ask the provider what site-specific work, plan licensing, engineering, and utility review are still required.

Accepted Plans

6 plans

Permit Requirements

2 requirements

Site specific

Municipal site review

Government PDF

Tumwater performs project-specific zoning, site, utility, structural, and permit review.

Last checked
Aug 12, 2026
Notes
Not listed in source

All

Plan modification restriction

Government PDF

Changes beyond permitted options can require additional review and may lose pre-approved treatment.

Last checked
Aug 12, 2026
Notes
Not listed in source

Fees

2 fee records

Site specific

Permit and site fees

Government PDF

Variable; ordinary municipal permits, utilities, engineering, and applicable impact fees remain.

Last checked
Aug 12, 2026
Notes
Not listed in source

Official Sources

2 sources

Tumwater ADU FAQ

6 answers

Does Tumwater have accepted or pre-approved ADU plans in this directory?

Yes. The current Tumwater, Washington page lists 6 accepted plans from 1 provider in the source-backed export.

What ADU plan sizes are listed for Tumwater?

The listed Tumwater plan records range from 480 to 1,000 sq ft. Use the individual plan cards to confirm bedrooms, bathrooms, plan documents, and provider details because some fields are not listed by every official source.

Where do the Tumwater ADU plan records come from?

They are tied to 2 official sources in this page's source set, including Cities of Lacey, Olympia, Tumwater, and Yelm and Cities of Olympia, Lacey, and Tumwater. Each plan, fee, and permit note should still be checked against the linked official source before use.

Can Thurston County or nearby city ADU plans be used in Tumwater?

This page includes plans accepted for Tumwater that originated in Olympia. That does not mean every Thurston County or nearby city plan applies in Tumwater; rely on the accepted-plan record and official source link for each listing.

Do pre-approved ADU plans guarantee permits in Tumwater?

No. A source-backed accepted plan can reduce plan review work, but Tumwater can still require site-specific review, zoning checks, fees, utility coordination, and current code compliance. This page lists 2 permit requirements to help flag items to verify with the local building department.

Are Tumwater ADU permit fees and requirements listed?

This page includes 2 fee records and 2 permit requirements for Tumwater. These are source-backed summaries, not a final permit quote or approval checklist.