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AB-557 • 2026

California Factory-Built Housing Law.

California Factory-Built Housing Law.

Housing
Active

The official status still shows this bill as active or still awaiting another formal step.

Sponsor
McKinnor
Last action
Official status
Senate - Housing
Effective date
Not listed

Plain English Breakdown

The official status shows a hearing was canceled, but the text confirms the bill passed both chambers and reached final enrollment.

California Factory-Built Housing Law

This law expands state rules for factory-built homes to cover large housing projects and shifts inspection duties from local governments to the state.

What This Bill Does

  • Expands existing laws to include approval of 'factory-built developments,' which are projects using at least 50% factory-built residential space.
  • Removes inspection and enforcement duties currently held by cities, counties, districts, and charter cities for these housing types.
  • Requires the Department of Housing and Community Development to create rules for qualifying installation inspection agencies.
  • Allows licensed architects to approve plans and specifications on behalf of the state department under penalty of perjury.
  • Mandates that approved plans be linked by unit serial number so they can be reused in future projects unless building standards change.

Who It Names or Affects

  • The Department of Housing and Community Development
  • Cities, counties, districts, and charter cities
  • Licensed architects who approve housing plans
  • Developers creating factory-built housing or developments

Terms To Know

Factory-Built Developments
Any development project where at least half of the residential square footage uses factory-built housing.
Insignia of Approval
A mark issued by the state department showing that a home meets required standards.

Limits and Unknowns

  • The bill states no reimbursement is required for local agencies, but does not specify the exact reason in this text.
  • Specific dates when these new rules take effect are not listed in the provided summary.
  • Detailed definitions of 'installation inspection agencies' will be created later through department regulations.

Bill History

  1. California Legislative Information

    Senate - Housing

Official Summary Text

California Factory-Built Housing Law.