Manufactured and Factory-Built Housing

The California Department of Housing and Community Development (HCD) oversees alterations of existing manufactured homes required to bear a U.S. Department of Housing and Urban Development (HUD) label. The Manufactured Housing Program also administers the construction and alteration of commercial modulars, special purpose commercial modulars, and multifamily manufactured homes, monitoring design and construction through third-party agencies. Additionally, this Program performs activities on behalf of HUD as a State Administrative Agency (SAA). The Factory-Built Housing Program oversees the health and safety of housing components and systems manufactured to California building standards.

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Building Codes

Download the matrix of codes (PDF) applicable to the construction of the different types of units, which can be helpful as an aid by third-party agencies and local enforcement authorities to determine the construction standards and enforcement authority.

Factory-Built Housing

The Factory-Built Housing Program oversees the safe design and quality production of factory-built homes.

Fire Sprinkler Systems

The Fire Sprinkler Systems page provides guidance on ensuring the safety for you and your manufactured home, mobilehome, and multifamily manufactured home in the event of a fire.

Insignia of Approval

An insignia of approval from HCD or HUD shows that the unit complies with the laws and building standards in effect at the time the insignia of approval was issued.

Laws and Regulations

The Laws and Regulations page provides more information about the applicable state and federal laws, and program regulations for both the Manufactured Housing and Factory-Built Housing Programs.

Modifying a Mobilehome

HCD must review and approve plans and specifications for the alteration or conversion of manufactured homes, multifamily manufactured homes, commercial modulars, and special purpose commercial modulars. HCD staff performs on-site inspections of alterations and conversions to the structural, fire safety, plumbing, mechanical, and electrical systems of regulated units. Visit the Modifying a Mobilehome page for more information.

State Administrative Agency

The State Administrative Agency page provides additional information on HCD’s responsibilities in this role.

Third-Party Design Approval Agencies

Third-Party Design Approval Agencies and Quality Assurance Agencies are certified to act on behalf of HCD, enforcing design and construction approval of commercial modulars, special purpose commercial modulars, and multifamily manufactured homes designated for sale in California.

Wildland-Urban Interface Areas

Visit the Wildland Urban Interfaces (WUI) page for information on unit installation and modification for exterior wildfire exposure in WUI areas.