What building codes apply to ADUs in Torrance?

Jennifer Smith

October 19, 2025 at 09:26 PM

Permits & Regulations Torrance, CA

I'm planning to build an ADU on my property in Torrance, CA, and I'm trying to get a clear understanding of the building codes and regulations that apply. I've got a decent-sized lot at about 6,500 square feet, and my budget is fairly tight, so I need to make sure I'm in compliance without any costly surprises down the line.

I've read some city documents and know that California state law supports ADU construction, but I'm a bit confused about how the specific local regulations in Torrance might affect my plans. For example, do I need to adhere to any special setback requirements for my lot? Also, I've read something about maximum height restrictions and parking requirements for ADUs—how do these apply in Torrance?

Additionally, I'm curious about the permitting process. How long does it typically take to get an ADU permit approved in Torrance? And are there any particular fees I should be aware of that might not be immediately obvious?

I’d really appreciate any insights from those who've gone through this process in Torrance or know the local regulations well. With my budget constraints, getting this right the first time is crucial, so any guidance would be extremely helpful. Thanks in advance!

1 Answer

Sarah Mitchell

October 19, 2025 at 05:50 PM

Building an ADU in Torrance, CA, can be a rewarding venture, both in terms of increasing your property value and providing additional living space or rental income. However, navigating the regulations and requirements can be complex. Let's break down the key considerations and steps involved in ensuring your project complies with both state and local regulations.

### Understanding Building Codes and Regulations

#### California State Laws:
- **SB-9 and AB-68**: These state laws are designed to streamline the process of building ADUs. They significantly limit local jurisdictions' ability to impose onerous restrictions. For instance, they prohibit minimum lot size requirements and allow for reduced setbacks.

#### City of Torrance Specifics:
- **Setback Requirements**: Torrance generally adheres to state-mandated setback requirements of 4 feet from side and rear property lines for ADUs. However, always verify with the local planning department as these can vary based on specific zoning districts within Torrance.
- **Height Restrictions**: Typically, detached ADUs are limited to 16 feet in height. However, if the ADU is attached to the primary residence, you may be allowed to match the height of the existing structure, subject to zoning.
- **Parking Requirements**: Torrance, in compliance with state law, does not require additional parking for ADUs if they are within 0.5 miles of public transit, or located within an existing structure like a garage.

### Permitting Process and Timeline

1. **Initial Research and Planning**: Begin by consulting Torrance’s Planning Department or their website for any specific guidelines or checklists. This is crucial to understand any recent changes that might not be widely published.

2. **Design and Pre-Application Meeting**: Once you have a preliminary design, schedule a pre-application meeting with the city planning department. This is an invaluable step to ensure your plans align with local regulations before submission.

3. **Submission**: Submit your plans for review. Ensure that your application includes all necessary documents, such as site plans, floor plans, and structural details.

4. **Review Period**: The City of Torrance typically processes ADU permits within 60 days. However, this can vary based on the complexity of your project and the current workload of the planning department.

5. **Approval and Fees**: Upon approval, you'll need to pay permit fees, which in Torrance can range from $5,000 to $10,000 depending on the size and scope of your ADU. These fees cover plan checks, building permits, and inspections.

### Tips and Common Pitfalls

- **Budgeting**: Be aware that construction costs in Torrance can average $150-$250 per square foot for an ADU. Factor in additional costs for landscaping, utilities, and potential site preparation.
- **Utilities**: Confirm if separate utility meters are required or beneficial for your ADU. This can affect upfront costs but might simplify billing if the unit is rented out.
- **Neighbor Relations**: While not a regulatory requirement, maintaining good communication with neighbors can be beneficial, especially concerning construction noise and parking during the build.

### Resources and Next Steps

- **Torrance Planning Department**: Utilize the city’s official resources to download guidelines and reach out for specific inquiries.
- **Consult a Local Architect or ADU Specialist**: Given the intricacies involved, hiring a professional with experience in Torrance can streamline the process and ensure compliance.
- **California Department of Housing and Community Development**: Their website offers a comprehensive guide to state ADU laws, providing clarity on what you can demand from local jurisdictions.

### Conclusion

Building an ADU in Torrance is a feasible endeavor, provided you meticulously follow the regulations and engage with the right resources. By understanding both state and local requirements, planning thoroughly, and leveraging local expertise, you can avoid costly surprises and ensure your project is a success. Remember, the upfront diligence and investment in understanding the process will pay off in a smooth project execution and a valuable addition to your property.

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Types of ADUs in Torrance, 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 Torrance, 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 Torrance.

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Why Build an ADU in Torrance?

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 Torrance, 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

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Types of ADUs in Torrance, CA

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