What building codes apply to ADUs in Long Beach?

Lisa Taylor

October 19, 2025 at 10:30 PM

Permits & Regulations Long Beach, CA

Hello everyone,

I'm a homeowner in Long Beach, California, and I'm considering constructing an Accessory Dwelling Unit (ADU) on my property. I have a 6,000 square foot lot and a budget of around $150,000. I've done some research about ADUs, but I'm still unsure about the specific building codes and regulations that apply in Long Beach. I want to make sure I follow all the rules to avoid any issues down the line.

Could someone clarify what specific building codes I need to adhere to for constructing an ADU in Long Beach? I've read about state-wide regulations, but I'm not clear on any additional local codes or restrictions that might apply.

I'm also curious about the permitting process. How detailed does my proposal need to be to get a permit approved? And, are there any common pitfalls in the application process that I should be aware of?

Finally, are there any particular design constraints or considerations I should keep in mind given my lot size? I want to ensure I'm maximizing the space efficiently while staying compliant.

Thanks in advance for any guidance or insights you can provide! It's a bit overwhelming, and I really appreciate the help.

1 Answer

Michael Park

October 18, 2025 at 12:54 PM

Hello and welcome to the journey of building an Accessory Dwelling Unit (ADU) in Long Beach! I’m glad you’re reaching out to understand the building codes and regulations—an essential step in ensuring a smooth construction process. Let me guide you through the specific regulations, processes, and design considerations you should keep in mind for your ADU project.

### Understanding Building Codes and Regulations

1. **State and Local Requirements**: In California, ADUs are governed by both state laws and local ordinances. Key statewide legislation includes SB-9 and AB-68, which streamline the approval process and reduce some of the regulatory burdens. However, Long Beach has its own specific ordinances that may add additional layers of requirements.

2. **Long Beach Specifics**:
- **Zoning**: Long Beach allows ADUs in most residential zones. Check the zoning of your property through the Long Beach Zoning Map to confirm.
- **Size Regulations**: The state law allows ADUs up to 1,200 square feet, but Long Beach might have specific restrictions based on your lot size and existing structures. Generally, you should be able to build an ADU up to 800 square feet by right.
- **Setbacks**: Typically, you need a minimum of 4 feet side and rear setbacks. Confirm with the local planning department as exceptions might apply.
- **Height Restrictions**: ADUs are generally limited to one story, but you might be able to build a two-story unit or convert an existing structure depending on local rules.

3. **Permitting Process**:
- **Proposal Details**: Your proposal should include detailed architectural drawings, site plans, and structural calculations. Ensure your plans are prepared by a licensed professional familiar with Long Beach's building codes.
- **Approval Timeline**: The permitting process can take anywhere from 60 to 120 days, depending on the complexity of your project and the current workload of the planning department.
- **Fees**: Expect permit fees to range from $4,000 to $8,000. This includes plan checks and inspections. Always verify the latest fee schedule with the city.

4. **Common Pitfalls**:
- **Incomplete Applications**: Ensure all documents are complete and accurate to avoid delays.
- **Ignoring Utility Upgrades**: Consider potential upgrades needed for water, sewer, and electrical systems. These can significantly impact budget and timeline.
- **Overlooking Fire Safety Requirements**: Long Beach requires adherence to specific fire safety codes, including access for emergency vehicles and fire-resistant materials.

### Design Considerations

Given your 6,000 square foot lot, you have a decent amount of space to work with. Here are some design considerations:

- **Maximize Natural Light**: Use large windows and skylights to make smaller spaces feel more open.
- **Open Floor Plan**: An open layout can help maximize space efficiency.
- **Sustainability**: Consider eco-friendly design elements like solar panels or energy-efficient appliances to save on long-term costs.
- **Privacy**: Position the ADU to maintain privacy for both the main dwelling and the ADU occupants. Landscaping can be a great tool to create separation without walls.

### Cost and Budgeting

With a budget of $150,000, you’re in a good position for a well-sized ADU. Here’s a rough breakdown:

- **Construction Costs**: Expect to spend between $150 to $300 per square foot. For a 600 square foot ADU, this translates to $90,000 to $180,000.
- **Design and Planning**: Allocate around $8,000 to $15,000 for architectural and engineering services.
- **Permitting and Fees**: As mentioned, budget $4,000 to $8,000.

### Next Steps

1. **Consult with Local Experts**: Engage a local architect or designer familiar with Long Beach ADU projects. Their insights can be invaluable.
2. **Visit the Long Beach Development Services**: They can provide specific guidance tailored to your property.
3. **Join Local Forums or Groups**: Connect with other homeowners who have built ADUs in Long Beach for firsthand advice.

### Resources

- **Long Beach Development Services**: [Long Beach Development Services Website](http://www.lbds.info/)
- **California Department of Housing and Community Development**: [HCD ADU Handbook](https://www.hcd.ca.gov/policy-research/accessorydwellingunits.shtml)

Embarking on an ADU project can be complex, but with careful planning and the right guidance, it can also be incredibly rewarding. Best of luck with your project, and feel free to reach out if you have more questions!

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Types of ADUs in Long Beach, CA

Understanding the different types of Accessory Dwelling Units can help you choose the best option for your property and needs.

Detached ADU

A separate, standalone structure built on your property. Offers maximum privacy and flexibility for tenants.

Complete privacy
Custom design options
Higher rental income potential

Attached ADU

An addition to your existing home with a separate entrance. Cost-effective option with shared utilities.

Lower construction costs
Shared utility connections
Family-friendly proximity

Garage Conversion

Convert existing garage space into a livable unit. Most cost-effective ADU option with fastest approval.

Lowest construction cost
Faster permitting
Uses existing structure

JADU

Junior ADU created within the existing home. Maximum 500 sq ft with efficiency kitchen and shared utilities.

Minimal construction
No parking requirement
Perfect for family use

Upper Floor ADU

Add a second story or convert existing upper floor space. Maximizes property value and rental potential.

Premium rental rates
Enhanced privacy
Great city views

Basement ADU

Convert basement or lower level into living space. Great option for properties with existing below-grade areas.

Uses existing space
Natural temperature control
Sound isolation

ADU Cost Guide for Long Beach, CA

Understanding ADU costs helps you budget effectively and make informed decisions about your project. Costs vary based on size, complexity, and local factors.

ADU Type	Size Range	Cost Range	Timeline	Best For
Garage Conversion	400-800 sq ft	$80K - $150K	3-6 months	Budget-conscious homeowners
JADU	Up to 500 sq ft	$50K - $100K	2-4 months	Family use, minimal disruption
Attached ADU	600-1,000 sq ft	$120K - $200K	4-8 months	Shared utilities, family proximity
Detached ADU	600-1,200 sq ft	$150K - $300K	6-12 months	Maximum rental income
Two-Story ADU	800-1,500 sq ft	$200K - $400K	8-15 months	Maximizing property value

Cost Factors to Consider

Site Preparation: $5K - $25K
Permits & Fees: $3K - $15K
Utility Connections: $5K - $20K
Finish Level: $10K - $50K variance
Landscaping: $2K - $10K

Potential ROI

Rental Income: $1,500 - $4,000/month
Property Value Increase: 20-30%
Payback Period: 8-15 years
Tax Benefits: Depreciation allowances
Equity Growth: Long-term appreciation

Get Your Personalized Cost Estimate

These are general ranges. Your actual costs may vary based on specific site conditions, design choices, and local market factors in Long Beach.

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Why Build an ADU in Long Beach?

Financial Benefits

Rental Income: Generate $18,000-$48,000 annually

Property Value: Increase home value by 20-30%

Tax Benefits: Depreciation and expense deductions

Investment: Strong ROI in California markets

Lifestyle Benefits

Multigenerational Living: Keep family close while maintaining privacy

Home Office: Create dedicated workspace or studio

Guest Space: Comfortable accommodations for visitors

Sustainability: Increase housing density efficiently

Popular ADU Floor Plans

Explore our most popular ADU designs that work well in Long Beach, CA. These professionally designed floor plans optimize space and functionality while meeting local building requirements.

Cascade ADU Floor Plan - 2 Bedroom, 2 Bathroom

2 Bed 2 Bath 1,200 sq ft

The Cascade

Spacious 2-bedroom design perfect for families. Features open living area, full kitchen, and two full bathrooms with optimal privacy.

Open floor plan
Master suite
Laundry room

Summit ADU Floor Plan - 2 Bedroom, 2 Bathroom

2 Bed 2 Bath 950 sq ft

The Summit

Efficient 2-bedroom layout maximizing every square foot. Great for narrow lots with smart storage solutions throughout.

Compact design
Pantry storage
Two full baths

Brookside ADU Floor Plan - 2 Bedroom, 2 Bathroom

2 Bed 2 Bath 1,400 sq ft

The Brookside

Luxurious 2-bedroom design with premium features. Includes master suite, guest bedroom, and spacious living areas.

Large living room
Walk-in closets
Full kitchen island

Sequoia ADU Floor Plan - 3 Bedroom, 2 Bathroom

3 Bed 2 Bath 1,100 sq ft

The Sequoia

Unique 3-bedroom configuration perfect for larger families. Features dual bathrooms and smart space utilization.

Three bedrooms
Laundry room
Multiple closets

Crestline ADU Floor Plan - 3 Bedroom, 2 Bathroom

3 Bed 2 Bath 1,500 sq ft

The Crestline

Premium 3-bedroom layout with maximum comfort. Features spacious bedrooms, walk-in closets, and luxury finishes.

Primary suite
Pantry space
Open concept

Ready to Explore More ADU Designs?

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Types of ADUs in Long Beach, CA

Understanding the different types of Accessory Dwelling Units available in Long Beach, CA can help you choose the best option for your property and budget.