---
type: "Bill"
title: "Concerning accessory dwelling unit regulation."
description: "Concerning accessory dwelling unit regulation."
jurisdiction: "us/states/wa"
legislature: "Washington Legislature"
session: "2019-2020"
identifier: "SB 6617"
citation: "Washington SB 6617 (2019-2020)"
classification: ["bill"]
subjects: ["HOMES AND HOUSING", "GROWTH MANAGEMENT"]
status: "enacted"
primary_sponsors: ["Liias"]
version_count: 3
action_count: 35
vote_count: 3
first_action: "2020-01-27"
last_action: "2020-03-27"
source: "openstates"
source_identifier: "ocd-bill/e90789c0-cb3b-4eb3-9aee-d78abd36402b"
source_url: "http://apps.leg.wa.gov/billinfo/summary.aspx?bill=6617&year=2019"
source_hash: "abe8e8b55fd453d3cf9fad4c1beacc44a9bca8ac5042118465ff8423889316be"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-wa"]
---

# Washington SB 6617 (2019-2020) — Concerning accessory dwelling unit regulation.

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **Bill** (committee substitute) — [source](http://lawfilesext.leg.wa.gov/Biennium/2019-20/Htm/Bills/Senate%20Bills/6617.htm)
2. **Engrossed Substitute Bill** (committee substitute) — [source](http://lawfilesext.leg.wa.gov/Biennium/2019-20/Htm/Bills/Senate%20Bills/6617-S.E.htm)
3. **Substitute Bill** (committee substitute) — [source](http://lawfilesext.leg.wa.gov/Biennium/2019-20/Htm/Bills/Senate%20Bills/6617-S.htm)

## Votes

- Final Passage as Amended by the House (#29) — **94–3** (pass) · lower
- Final Passage as Amended by the House (#23) — **41–8** (pass) · upper
- 3rd Reading & Final Passage (#21) — **31–17** (pass) · upper

## Sponsors

- Liias — primary (person)
- Das — cosponsor (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2020-01-27** First reading, referred to Housing Stability & Affordability. `reading-1`
- **2020-02-05** HSA - Majority; 1st substitute bill be substituted, do pass. `passage`
- **2020-02-05** Minority; do not pass.
- **2020-02-06** Passed to Rules Committee for second reading.
- **2020-02-17** Placed on second reading by Rules Committee.
- **2020-02-19** 1st substitute bill substituted. `substitution`
- **2020-02-05** HSA - Majority; 1st substitute bill be substituted, do pass. `passage`
- **2020-02-05** Minority; do not pass.
- **2020-02-06** Passed to Rules Committee for second reading.
- **2020-02-17** Placed on second reading by Rules Committee.
- **2020-02-19** 1st substitute bill substituted. `substitution`
- **2020-02-19** Floor amendment(s) adopted.
- **2020-02-19** Rules suspended. Placed on Third Reading.
- **2020-02-19** Third reading, passed; yeas, 31; nays, 17; absent, 0; excused, 1. `reading-3`
- **2020-02-24** First reading, referred to Environment & Energy. `reading-1`
- **2020-02-27** ENVI - Majority; do pass with amendment(s).
- **2020-02-27** Minority; do not pass.
- **2020-02-28** Referred to Rules 2 Review.
- **2020-03-02** Rules Committee relieved of further consideration. Placed on second reading.
- **2020-03-06** Committee amendment not adopted. `amendment-failure`
- **2020-03-06** Floor amendment(s) adopted.
- **2020-03-06** Rules suspended. Placed on Third Reading.
- **2020-03-06** Third reading, passed; yeas, 94; nays, 3; absent, 0; excused, 1. `reading-3`
- **2020-03-10** Senate concurred in House amendments.
- **2020-03-10** Passed final passage; yeas, 41; nays, 8; absent, 0; excused, 0. `passage`
- **2020-03-12** President signed. `passage`
- **2020-03-12** Speaker signed. `passage`
- **2020-03-12** Delivered to Governor.
- **2020-03-27** Governor signed. `executive-signature`
- **2020-03-27** Chapter 217, 2020 Laws. `became-law`
- **2020-03-27** Effective date 6/11/2020. `became-law`
- **2020-01-29T18:30:00+00:00** Scheduled for public hearing in the Senate Committee on Housing Stability & Affordability at 01:30 PM
- **2020-02-05T18:30:00+00:00** Scheduled for public hearing in the Senate Committee on Housing Stability & Affordability at 01:30 PM
- **2020-02-25T20:30:00+00:00** Scheduled for public hearing in the House Committee on Environment & Energy at 03:30 PM
- **2020-02-27T13:00:00+00:00** Scheduled for public hearing in the House Committee on Environment & Energy at 08:00 AM

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/e90789c0-cb3b-4eb3-9aee-d78abd36402b`. Confidence: reported (aggregated from official Washington legislature records).