HCD’s Division of Codes and Standards is responsible for establishing, maintaining, updating, and enforcing regulations that affect the health and safety of housing and communities. Specifically:

• Mobilehomes
• Manufactured homes
• Multifamily manufactured homes
• Floating homes
• Truck campers
• Mobilehome parks and special occupancy parks
• Factory-built housing
• Employee housing
• Commercial modulars
• Special purpose commercial modulars
• Hotels, motels, apartment houses, and dwellings or portions thereof and buildings and structures accessory thereto

Existing laws and regulations for these programs can be found on the individual program pages.

HCD’s rulemaking process is an opportunity for the Department and interested parties to work together to develop regulations that impact the general welfare and well-being of the public.

One of the first required steps in rulemaking is to file a Notice of Proposed Action (Notice) with the Office of Administrative Law (OAL). Once filed, OAL will publish the Notice in the California Regulatory Notice Register (Register). HCD will also post the Notice on its website for public review.

The published Notice contains information about the proposed rulemaking, including deadlines for submitting public comments, where to locate the initial proposed express terms, and the initial statement of reasons.

A public comment period will be noted on the day the Notice is published in the Register. During the open comment period, the public is allowed to submit comments specific to the posted rulemaking package. See below for more information on public comments.

Government Code section 11346 provides that every California state agency must meet the basic minimum procedural requirements set up by the Administrative Procedure Act (APA) for the adoption, amendment, or repeal of an administrative regulation unless the agency is expressly exempted by statute. The rulemaking process must also comply with the regulations adopted by OAL.

Public comment periods provide interested parties with a meaningful opportunity to participate in the adoption of regulations.

Public comment periods are typically 15 – 45 days. The Notice of Proposed Action specific to each rulemaking package contains the information needed to submit public comments and the public comment timeframes.

There are multiple ways you can submit comments:

Electronically via the Public Comment Portal — Please note: The portal is available to provide feedback on proposed title 25 rulemaking packages during the public comment period only. Please check Current Rulemaking Activities for proposed regulations that are open for public comment.

By mail to:
California Department of Housing and Community Development
Division of Codes and Standards
P.O. Box 277820
Sacramento, CA 95827-7820
ATTN: PACKAGE NAME — Housing Regulations Team

By email to:
Title25@hcd.ca.gov
Subject Line: PACKAGE NAME — Housing Regulations Team

Current title 25 rulemaking packages are listed below. Members of the public are encouraged to participate in the rulemaking process by submitting public comments using the electronic portal for proposed regulations listed below. Note that the electronic portal is only active for proposed regulations during the public comment period.

Mobilehome Residency Law Protection Program (MRLPP) Certificate of Compliance:

HCD is proposing to permanently adopt regulations amending California Code of Regulations, title 25, chapter 3.5, governing the Mobilehome Residency Law Protection Program (MRLPP), which was established by the Mobilehome Residency Law Protection Act (Act). Emergency regulatory action was taken to provide continuity of service to manufactured/mobilehome homeowners that submit Mobilehome Residency Law (MRL) complaints for referral to contracted legal services providers. The emergency regulations were necessary to execute legal services provider contracts in a timely manner without loss of service and to comply with statutory requirements of the Act. The emergency regulations were submitted to the Office of Administrative Law (OAL) for review on July 31, 2024, and approved for immediate effect on August 12, 2024. They were readopted on February 11, 2025 and extended through May 12, 2025.

If approved, this action would convert the approved emergency regulations to permanent regulations through the certificate of compliance procedure pursuant to the Administrative Procedures Act as overseen by OAL.

HCD held a 45- day comment period from December 6, 2024 through January 22, 2025 at 8:00 A.M.

• Notice of Proposed Action (PDF)
• Express Terms (DOC)
• Initial Statement of Reasons (PDF)