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Evergreen Ledger

SSB 6158

In Committee

Senate

Factory built structures

Adopting national standards for factory built housing and commercial structures.

This status may be delayed. See Action History below for the latest updates.

How does a bill become law?
  1. Introduced: The bill is filed and assigned a number.
  2. Committee: A subject-matter committee holds hearings, takes public testimony, and decides whether to advance the bill.
  3. Floor Vote: The full chamber (House or Senate) debates and votes on the bill.
  4. Opposite Chamber: The bill repeats the committee and floor vote process in the other chamber.
  5. Governor: The Governor reviews the bill and decides whether to sign or veto it.
  6. Signed: The bill has been signed into law.
Introduced: February 2, 2026
Last Action: February 26, 2026
Status: S Rules X
Companion Bill:
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AI Analysis

This analysis was generated by AI and may contain errors. It is not legal advice. Always refer to the official bill text for authoritative information.
People & CommunitiesPeople-leaningCorporate & Wealthy Interests

This bill updates Washington’s rules for factory-built housing and commercial structures to align with national safety and construction standards, and clarifies how inspections are conducted. It expands the use of third-party inspectors while requiring strict independence and competency standards, and gives the state more flexibility during emergencies.

  • Clarifies definitions for 'factory built housing' (including tiny houses with or without wheels), 'commercial structure', 'install', and 'qualified inspection agency' to align with national standards.
  • Allows the Department of Labor & Industries to delegate inspection duties to local enforcement agencies or approved third-party (qualified) inspection agencies, provided they are independent, competent, and disclose conflicts of interest.
  • Requires the Department to adopt rules consistent with national consensus standards from the International Code Council (ICC), including codes for planning, design, fabrication, assembly, and inspections.
  • Mandates that qualified inspection agencies use personnel with appropriate certifications (e.g., ICC certification recognized as meeting the requirement) and adequate equipment.
  • Permits the Department to accept plans certified by professionals licensed in other states with equivalent or stricter requirements.
  • Authorizes the governor to suspend fee collection during a state of emergency to support rapid housing or infrastructure response.

Who is affected

  • Factory-built housing and commercial structure manufacturers — Manufacturers and suppliers of factory-built homes and commercial structures will need to ensure their products meet updated state standards and may face new inspection and certification requirements.
  • Local enforcement agencies (city/county building departments) — Local governments (cities and counties) may take on more responsibility for inspecting installations, or work with third-party inspectors, under new delegation rules.
  • Qualified inspection agencies (third-party inspectors) — Private inspection companies that meet qualifications (e.g., ICC certification) may be hired to conduct inspections, creating new business opportunities but also requiring adherence to strict independence and competency standards.
  • Residents and property owners using factory-built housing — Homebuyers and property owners using factory-built housing (including tiny houses) will benefit from more consistent safety standards and oversight, especially for structures installed on-site.
  • Commercial property owners and developers — Businesses using factory-built structures for commercial, industrial, or assembly purposes (e.g., offices, schools, retail) will be subject to updated safety and inspection rules.
Effective: July 1, 2026Fiscal impact: The Department of Labor & Industries will collect new fees to cover costs of administering and enforcing the updated rules; no significant new appropriation is required. Fees may increase slightly to support expanded inspection oversight.
Model: Intel/Qwen3-Coder-Next-int4-AutoRoundGenerated: Mar 19, 2026 at 9:42 PM

Pro/Con Analysis

Stronger case for benefits

Potential Benefits (5)

  • The expanded definition of 'factory built housing' explicitly includes tiny houses with wheels, clarifying regulatory coverage for a rapidly growing segment of alternative housing—especially beneficial for low-income, rural, and unhoused populations seeking affordable shelter.

    HousingPeopleRef: Sec. 1(3) (expansive definition of 'factory built housing' including wheel-equipped tiny houses); Sec. 1(7) (broad definition of 'commercial structure')

  • Mandating use of nationally recognized safety and inspection standards (ICC) and requiring qualified, independent inspectors significantly improves structural safety and reduces risks of fire, collapse, or system failure—especially critical for low-income residents in factory-built homes who may lack resources for post-installation repairs.

    Public SafetyPeopleRef: Sec. 2 (delegation to qualified inspection agencies); Sec. 3(1) (adoption of ICC standards)

  • Streamlined recognition of out-of-state licensed professionals and standardized inspection requirements reduce redundant compliance burdens for manufacturers and contractors, potentially lowering costs and increasing access to qualified labor—especially beneficial for small and mid-sized firms operating across state lines.

    Business & EmploymentPeopleRef: Sec. 3(3) (acceptance of out-of-state certified plans); Sec. 2 (qualified inspection agency independence and competency)

  • The governor’s authority to suspend fees during emergencies—combined with expanded delegation to local and state enforcement agencies—enables faster deployment of temporary housing or critical infrastructure during disasters, directly supporting vulnerable populations in crisis response.

    Public SafetyPeopleRef: Sec. 3(4) (emergency fee suspension authority); Sec. 1(6) (definition of 'local enforcement agency' including state agencies)

  • By formally including wheel-equipped tiny houses in the regulatory framework and requiring structural and systems safety standards, the bill supports safer, more sustainable micro-housing options—encouraging efficient land use and reducing sprawl pressures on natural areas.

    EnvironmentPeopleRef: Sec. 1(3) (definition of 'factory built housing' includes tiny houses with wheels); Sec. 3(1) (adoption of ICC standards)
Potential Concerns (4)

  • The bill authorizes new fees to cover administrative costs, and while fees are intended to be cost-recovery, the requirement for third-party inspections may increase compliance costs for manufacturers and installers—particularly small firms—which could be passed on to consumers.

    FinancialRef: Sec. 2 (delegation to qualified inspection agencies); Sec. 3(2) (fee schedule)

  • The requirement for qualified inspection agencies to be independent and certified (e.g., ICC) may raise barriers to entry for small inspection firms, consolidating inspection services among larger, well-capitalized firms with existing certifications.

    Business & EmploymentRef: Sec. 2 (qualified inspection agency independence and conflict-of-interest disclosure requirements); Sec. 3(1) (adoption of ICC standards)

  • While improved standards may increase long-term safety, the need for certified inspections and compliance with national standards may raise the cost of factory-built housing—especially for low-income buyers—potentially reducing affordability of alternative housing options during a regional housing crisis.

    HousingLean peopleRef: Sec. 3(2) (fee schedule); Sec. 3(1) (adoption of ICC standards)

  • The governor’s emergency authority to suspend fees may reduce local government revenue during crises if local agencies rely on inspection fees, though the bill does not clarify whether local enforcement agencies would be reimbursed.

    Local GovernmentRef: Sec. 3(4) (emergency fee suspension authority)

Who Is Most Affected

Low- and moderate-income residents using factory-built housingPositive Impact

Low- and moderate-income residents seeking affordable housing options—especially those using tiny homes, modular homes, or manufactured structures—will benefit from clearer safety standards and expanded regulatory coverage, improving housing security and reducing risks of structural failure.

Factory-built housing manufacturers and installers (small/mid-sized)Mixed Impact

Small and mid-sized manufacturers and installers of factory-built housing may benefit from streamlined recognition of out-of-state certifications and reduced redundant compliance burdens, but may face higher compliance costs due to mandatory third-party inspections and ICC-standard upgrades.

Third-party inspection agencies (especially large or established firms)Positive Impact

Large inspection firms with ICC-certified personnel and existing infrastructure are best positioned to benefit from the expansion of third-party inspection authority; smaller or newer inspection firms may struggle to meet the independence, equipment, and certification requirements.

Local enforcement agencies (city/county building departments)Mixed Impact

Local governments may gain flexibility in delegating inspection duties but could face added administrative or fiscal burdens if they assume inspection responsibilities without additional state funding or fee compensation.

Commercial property owners and developersMixed Impact

Commercial developers using factory-built structures (e.g., schools, offices, modular retail) will benefit from clearer, consistent safety standards and streamlined plan review, but may face higher upfront inspection and certification costs.