How to Get an ADU Permit in Huntington Beach

What Is an ADU?

is a smaller, independent living unit built on the same lot as a single-family or multifamily home. ADUs can come in various forms:

Detached ADUs – Separate structures in the backyard
Attached ADUs – Extensions to your existing home
Garage Conversions – Transforming garages into full living spaces
Interior Conversions – Turning part of your home (e.g., basement or attic) into a private unit
Junior ADUs (JADUs) – Up to 500 sq ft, usually carved from existing space in the home

Understanding local regulations is essential before embarking on your ADU project:

Zoning: ADUs are permitted in most residential zones.
Size Limits:
- Detached ADUs: up to 1,200 sq ft
- Attached ADUs: cannot exceed 50% of the primary home’s size
- JADUs: up to 500 sq ft
Height Restrictions: Maximum height of 35 feet for detached and attached ADUs.
Setbacks: Minimum of 4 feet from side and rear property lines.
Parking: No additional parking required if ADU is within ½ mile of public transit.
Owner Occupancy: For JADUs, the property owner must reside on the property.

Check Zoning & Eligibility
Use the Huntington Beach zoning map or contact the Planning Division to confirm ADU eligibility.
Choose Your ADU Type & Design
Decide between a detached unit, conversion, or JADU. Work with a licensed architect or designer to create ADU plans that meet local code.
Submit Your Permit Application
Submit your plans through the city’s Citizen Access Portal or in person at the Permit Center.
Undergo Plan Review
City staff will review zoning, structural, energy, and fire compliance. Revisions may be requested.
Pay Fees & Obtain Your Permit
Once approved, pay your applicable building and impact fees.
Begin Construction & Schedule Inspections
Hire a licensed contractor to start building. Schedule inspections as required throughout construction.
Final Approval
After passing all inspections, receive your final sign-off and occupancy certification.

Permit Type	Estimated Cost
Building Permit	$2,500 – $5,000
Electrical Permit	$400 – $700
Plumbing Permit	$400 – $800
Mechanical Permit	$300 – $600
Plan Check Fees	$1,000 – $3,000
School Impact Fees (if >750 sq ft)	$3 – $5 per sq ft
Utility Connection Fees	Varies by location/utilities
Total Estimated Cost	$6,000 – $15,000+

✅ Generate Passive Rental Income

Earn consistent income through long-term or short-term rentals.

✅ Add Significant Home Value
Permitted ADUs can boost your home’s resale value by up to 30%.

✅ Support Multigenerational Living
Provide independent living space for aging parents or young adults.

✅ Stay Legal and Avoid Fines
Permits ensure your structure meets building codes and avoids city penalties.

✅ Access Incentives & Financing
Permitted ADUs may qualify for state grants, tax deductions, and ADU-friendly loans.

Do I need a permit to convert my garage into an ADU in Huntington Beach?

Yes. Even if it's an existing structure, you’ll need permits to convert it into a legal, livable space.

Can I build both an ADU and a JADU on the same property?

Yes, state law allows one ADU and one JADU per single-family lot if space and zoning allow.

How long does it take to get an ADU permit?

On average, 4 to 8 weeks for plan review and approvals—longer if design revisions are needed.

Can I live in the ADU and rent out my main house?

Yes. Huntington Beach does not require owner-occupancy for standard ADUs.

Are there grants for ADU construction in California?

Yes. Programs like CalHFA’s ADU Grant can offer up to $40,000 for pre-development costs. Check current availability and qualifications.