SB 6158 Washington Senate · 2025-2026 Regular Session

Adopting national standards for factory built housing and commercial structures.

This bill requires all factory-built housing and commercial structures installed in Washington to be approved by the Department of Labor & Industries (DLI) before installation, using national safety standards from the International Code Council. It establishes a statewide approval process that overrides local building codes for approved structures, ensuring consistency across cities and counties. Manufacturers and installers must obtain DLI approval and display an official insignia, with modifications requiring prior departmental review. The bill also creates a system for independent "qualified inspection agencies" to conduct safety checks under DLI oversight.

Issues: ✓ Labor & Employment

Bill status in committee 1 of 4 stages cleared

Introduction

Jan 2026

Committee Review

Floor Vote

Governor

Introduced Jan 15, 2026 Last action Feb 26, 2026

Maddy AI version diff · 1 comparison

What changed between versions

Bill → Substitute Bill · 6 edits

MODERATE

The bill was formally amended from its original Senate Bill (SB 6158) to a Substitute Bill (SB 6158) after being referred to committee. The most significant substantive change is the addition of a new section (Sec. 2) that establishes a legal framework for the approval and installation of factory-built housing, including provisions for recognizing state-approved structures as compliant with local laws and prohibiting unauthorized modifications. The bill also includes minor formatting updates and clarifies the committee referral details.

Scope change

The bill's scope expanded by adding a new section that defines the rules for approving and installing factory-built housing, which was not present in the original version.

REQUIREMENT

Added a new section requiring that factory-built housing must be approved by the Department of Labor & Industries and bear an insignia of approval before installation.

Added provisions stating that approved factory-built housing is deemed to comply with local laws regarding construction and manufacture.

Added a prohibition on modifying approved factory-built housing before or during installation without departmental approval.

Added an exemption for prefabricated enclosures used by electric utilities for energy storage and electrical equipment.

TECHNICAL

Updated the bill header to reflect it is now a Substitute Bill and changed the reading date to 02/04/26.

Added the official committee name 'Senate Labor & Commerce' to the sponsor list.

Floor votes

How they voted

No floor votes recorded yet.

Full legislative history

Actions timeline

Total actions

Key actions

Committee

Feb 3, 2026

Upper · Passed

Minority; without recommendation.

upper

Feb 3, 2026

Upper · Passed

Executive action taken in the Senate Committee on Labor & Commerce at 10:30 AM.

upper

Jan 30, 2026

Upper · Passed

Public hearing in the Senate Committee on Labor & Commerce at 8:00 AM.

upper

1 primary · 6 co-sponsors