How much does a garage conversion ADU cost in Long Beach?

Linda Taylor

October 19, 2025 at 10:33 PM

Cost & Budget Long Beach, CA

Hello everyone,

I'm a homeowner in Long Beach, California, and I've been contemplating converting my detached garage into an ADU. My lot is about 6,500 square feet, which seems to offer enough space for this project. I've done some preliminary research, and I'm seeing a wide range of cost estimates for garage conversions—anywhere from $50,000 to over $150,000. I’d really appreciate some input from those who have gone through this process or have expertise in the area.

My budget is around $80,000, but I'm not sure if this is realistic. What are the main factors that could push the cost beyond this range? I know labor and materials can vary, but I'm specifically concerned about any unexpected expenses that might not be covered in typical estimates.

Moreover, how does Long Beach's permitting process affect the timeline and overall cost? Is there anything unique to the city that I should be aware of?

Lastly, for those who have completed conversions recently, did you find any resources or incentives from the city or state that helped manage costs effectively?

I'm eager to get started but want to ensure I'm fully prepared for what's ahead. Thanks in advance for any guidance or experiences you can share!

1 Answer

Lisa Rodriguez

October 19, 2025 at 03:10 AM

Hello there,

Converting your detached garage into an ADU in Long Beach is a fantastic way to add value to your property and possibly generate rental income. Given your budget of around $80,000, it’s important to approach this project with a clear understanding of potential costs, timelines, and local regulations to ensure you’re prepared for any hurdles along the way.

### Cost Overview

1. **Construction Costs**: In Long Beach, the average cost for a garage conversion to an ADU generally ranges between $90,000 and $150,000. Your budget of $80,000 is on the lower end, so you'll need to be strategic about cost-saving measures. Key factors influencing costs include:
- **Size and Condition of Existing Garage**: Smaller garages or those requiring minimal structural changes will cost less. However, if your garage lacks proper foundation, insulation, or needs significant electrical or plumbing upgrades, costs can escalate.
- **Interior Finishes**: High-end finishes and fixtures will increase costs. Opt for mid-range materials to stay within budget.
- **Labor and Materials**: Prices can fluctuate based on demand. Consider obtaining multiple quotes from contractors to find competitive rates.

2. **Permitting and Fees**: In Long Beach, plan for permitting costs to be around $1,500 to $3,000. This can vary based on the complexity of your project and specific city fees.

3. **Unexpected Expenses**: Be prepared for potential costs such as:
- **Utility Upgrades**: Connecting the ADU to water, sewer, and electrical systems can be costly, especially if your existing systems require significant upgrades.
- **Foundation Work**: If your garage doesn’t meet current standards, foundation reinforcement might be necessary.

### Timeline Considerations

The process from planning to completion typically takes 6 to 12 months, depending on factors like:
- **Design and Planning**: This can take 1 to 3 months. Engaging a designer familiar with Long Beach regulations can help streamline this phase.
- **Permitting Process**: Expect 2 to 4 months for city approvals. Long Beach has made efforts to expedite ADU permits, but it’s wise to anticipate potential delays.
- **Construction**: Once approved, construction usually takes 3 to 6 months. Ensure your contractor provides a detailed timeline and maintains clear communication.

### Local Considerations in Long Beach

- **Regulations**: Familiarize yourself with local ordinances and California state laws like SB-9 and AB-68, which facilitate ADU development by removing certain barriers. Long Beach’s ADU guidelines align with these laws, offering more flexibility in setbacks and parking requirements.
- **Historical Districts**: If your property is in a historical district, additional design considerations and approvals might be necessary, potentially impacting cost and timeline.

### Practical Tips

1. **Consult with Local Experts**: Engage with architects or contractors who have experience with ADUs in Long Beach. Their local knowledge is invaluable.
2. **Utility Checks**: Before starting, have your utilities assessed to avoid surprises during construction.
3. **Incentives and Resources**: Check for any available state or local incentives. California offers programs like the CalHFA ADU Grant Program, which might provide financial assistance.

### Next Steps

1. **Gather Quotes**: Contact several contractors to get detailed estimates and timelines. Ask for references to ensure quality and reliability.
2. **Design Planning**: Work with a designer to create a plan that maximizes space and adheres to local regulations.
3. **Permitting**: Submit your plans to the Long Beach building department early to kickstart the permitting process.
4. **Financing Options**: If your budget is tight, explore financing options like a home equity line of credit (HELOC) or renovation loans.

Converting your garage into an ADU is a rewarding project that can significantly enhance your property’s value and utility. By carefully planning and leveraging local resources and expertise, you can successfully navigate the complexities of this process. Best of luck with your conversion, and don't hesitate to reach out if you need further guidance!

Warm regards,

[Your Name]
Experienced ADU Consultant in Long Beach

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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

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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

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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
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Summit ADU Floor Plan - 2 Bedroom, 2 Bathroom

2 Bed 2 Bath 950 sq ft

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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
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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
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Crestline ADU Floor Plan - 3 Bedroom, 2 Bathroom

3 Bed 2 Bath 1,500 sq ft

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

Primary suite
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Open concept

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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.