What is an HCD Modular Building in California?
An HCD modular building is a factory-built structure that has been approved by the California Department of Housing and Community Development (HCD). These buildings display an HCD insignia and are constructed to meet the requirements of Title 25 regulations.
Do I Need a Permit to Install an HCD Modular Building in California?
Yes, almost all HCD modular buildings require a permit from your local city or county Building & Safety Department before installation.
Who handles the permit process for a modular building?
The property owner or their contractor is typically responsible for submitting plans and obtaining the required permits, including site plan, utility connections, and accessibility compliance.
What documents are needed for a permit application?
You’ll need the HCD insignia number, foundation plans, a site plan, utility connection details, and ADA access routes. Additional documents may be required based on your location and building use.
How long does the permit approval process take?
Permit timelines vary by jurisdiction, but most projects take 4–8 weeks from submission to approval if all documents are complete.
Are there different rules for used modular buildings?
Used buildings must have a valid HCD insignia and meet all current code requirements. The permit process is similar to that for new buildings, but may require additional inspections.
Where can I get help with the permitting process?
Contact Matt Banes at iModular.com for expert guidance, or recieve our free California Modular Building Permitting Guide.
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