Manufactured Housing, Commercial Modulars, and Mobilehomes

The Manufactured Housing Program staff administers the construction and alteration of commercial modulars, special purpose commercial modular, and multifamily manufactured homes, monitoring design and construction through third-party agencies. Program staff also performs activities on behalf of the U.S. Department of Housing and Urban Development (HUD) as a State Administrative Agency (SAA).

As the SAA, the Department’s Manufactured Housing (MH) Section has delegated authority to 1) oversee the manufacturer’s compliance with the requirements of the law and 2) to take appropriate action, including legal action, if the manufacturer does not comply with the requirements of the law. For more detailed information about this responsibility, read the State Administrative Agency information. 

Servicios bilingüe son disponible. Para hablar con un representante en español, por favor llame al numero (800) 952-8356 y pida un intérprete.

Laws and Regulations


California law governing manufactured housing is entitled the "Manufactured Housing Act of 1980" and may be found in Division 13, Part 2 of the California Health and Safety Code, commencing with Section 18000 .

Federal laws governing manufactured housing built on or after June 15, 1976, are found in Title 42, U.S. Code, Chapter 70, beginning Section 5401 .


The Department’s regulations can be found in California Code of Regulations, Title 25, Division I, Chapter 3, Subchapter 2, commencing with section 4000. These regulations establish minimum design and construction standards for all multifamily manufactured homes and mobilehomes built before June 15, 1976, and commercial modular and special purpose commercial modulars to be sold, rented, or leased throughout the State. These regulations are preemptive over any local requirements. Manufactured homes constructed on or after June 15, 1967, are subject to federal laws and regulations. Alteration of existing manufactured homes bearing or required to bear a Housing and Urban Development (HUD) label; multifamily manufactured homes, and mobilehomes built on or before June 15, 1976; commercial modulars and special purpose commercial modulars bearing or required to bear a Department insignia are subject exclusively to Department regulation, plan review, and inspection throughout the State regardless of their location. 

Federal regulations governing manufactured housing built on or after June 15, 1976, are located in Title 24, Code of Federal Regulations, beginning with Section 3282.1 . Construction standards for manufactured homes manufactured on or after June 15, 1976, are found in Title 24, Code of Federal Regulations, Chapter XX, Part 3280 .

Federal Legal Authorities and Clarification

When federal rules (regulations) are in need of clarification, HUD issues interpretive Bulletins or B-Letters to clarify the requirements. For additional information on federal legal authorities, go to HUD’s Construction and Safety Program information.

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.

Information Bulletins

Modifying a Mobilehome:  Manufactured or Mobilehome Alteration, Permit Requirements, and Inspections

Before beginning any work on your manufactured home or mobile home, these permit application (PDF) to apply for a permit.

The Department must review and approve plans and specifications for the alteration or conversion of manufactured homes, multi-unit manufactured homes, commercial modulars, and special purpose commercial modulars. Department employees perform on-site inspections of alterations and conversions to the structural, fire safety, plumbing, mechanical, and electrical systems of regulated units.

Home Installation

How to Report to the Department of Housing and Community Development (HCD) the Installation of Manufactured Homes, Mobilehomes, and Multifamily Manufactured Homes:

Responsibilities of a Manufacturer, Dealer, or Local Enforcement Agency During the Sale and Installation of:

Manufactured Homes Installed on Pier/Pad or on a Foundation System as Chattel [HSC 18551(b) or 18613] (PDF)

Insignia of Approval

The Department's insignia is required on mobilehomes, commercial and coaches and special purpose commercial coaches. The U.S. Development (HUD) label is required on manufactured homes mobilehomes. 

If anyone has any questions, whom may they contact? 

For insignia replacement questions, call the Manufactured Housing Section at (916) 445-3338.

Wildland Urban Interface Areas

For information on unit installation and modification in Wildland Urban Interface (WUI) Areas, consult the standards, regulations, and information required. 

Fire Sprinkler and Mold and Lead-Based Paint Concerns

Check the information available in the Consumer Information and Guidebooks especially related to fire sprinkler requirements and mold and lead-based paint concerns.

Third-Party Agencies

Third-party agencies are certified by the Manufactured Housing Program staff to act on behalf of the Department of Housing and Community Development enforcing design and construction approval of commercial modular, special purpose commercial modular, and multi-unit manufactured homes designated for sale in California.  

Field Operations Assistance

Northern Area Office
(916) 255-2501
9342 Tech Center Drive, Suite 550
Sacramento, CA 95826-2581
Street Map *

Hours of Operation:  Monday – Friday, 8 a.m. – 5 p.m.

Southern Area Office
(951) 782-4420
3737 Main Street, Suite 400
Riverside, CA 92501-3337
Street Map *

Hours of Operation:  Monday – Friday, 8 a.m. – 5 p.m.

*The maps to our offices listed above are provided by "Google Maps." The products and services advertised are not promoted or endorsed by the Department of Housing and Community Development.