Can I design an ADU with a separate entrance in Los Angeles?

Sarah Williams

October 20, 2025 at 02:58 AM

Design & Planning Los Angeles, CA

Hello everyone,

I'm a homeowner in Los Angeles, and I've been researching the possibility of adding an ADU (Accessory Dwelling Unit) to my property to accommodate my aging parents. My lot is about 6,500 square feet, which I believe is within the acceptable range for an ADU based on what I’ve read. I have a budget of around $150,000 and would love to have a separate entrance to maintain privacy for everyone.

However, I’m a bit confused about some of the regulations and design aspects. I've read through some of the city’s guidelines, but I'm hoping someone here can clarify a few things for me:

1. **Separate Entrance:** Is it permissible to design an ADU with a completely separate entrance, and are there specific regulations or setbacks I need to be aware of to ensure it's compliant?

2. **Design Constraints:** Are there particular design constraints for such structures in my area that I should consider, especially concerning height and distance from the main house?

3. **Parking Requirements:** I understand there might be parking requirements. Since my street is pretty narrow, how flexible are these rules?

4. **Approval Process:** How long does the approval process typically take, and are there common pitfalls I should try to avoid to streamline this?

I want to ensure everything is done by the book, so any insights or advice from those who've been through this would be greatly appreciated!

Thanks in advance for your help!

1 Answer

Nick

October 18, 2025 at 06:01 AM

Hello!

It’s great to hear that you’re considering adding an ADU to your Los Angeles property to accommodate your parents. This can be a wonderful way to provide them with privacy and independence while keeping them close by. Let’s dive into your questions and help you get started on the right foot.

### 1. Separate Entrance

Yes, you can absolutely design an ADU with a separate entrance. In fact, having a separate entrance is a common feature that enhances privacy and convenience. The City of Los Angeles allows for this, but here are some specifics to keep in mind:

- **Setbacks**: Typically, detached ADUs must maintain a rear and side setback of at least 4 feet. This is crucial for both compliance and the comfort of your ADU occupants.
- **Fire Safety and Accessibility**: Ensure the entrance is easily accessible for emergency services and consider accessibility features for your aging parents, such as a ramp if necessary.

### 2. Design Constraints

In Los Angeles, certain design constraints must be considered:

- **Height**: For a detached ADU, the maximum height is generally 16 feet. However, if your ADU is above a garage, this can sometimes be extended to 25 feet, depending on local ordinances.
- **Distance from Main House**: While there isn't a specific required distance from the main house, the placement should respect both functionality and aesthetic appeal, while adhering to setback requirements.
- **Floor Area**: The maximum size for a detached ADU is 1,200 square feet, but you should also consider the total floor area ratio (FAR) of your property to ensure compliance.

### 3. Parking Requirements

Under the current state laws (such as SB-13), no additional parking is required for an ADU if your property is within half a mile of public transit, which is common in many parts of Los Angeles. Given the narrowness of your street, this is likely a relief. However, verify your specific location’s transit proximity to ensure this exemption applies.

### 4. Approval Process

The approval process for an ADU in Los Angeles can vary, but here's a general timeline:

- **Planning and Design**: This can take anywhere from 1 to 3 months, depending on the complexity of your design and the responsiveness of your architect or designer.
- **Permitting**: Once your plans are ready, submitting them to the Los Angeles Department of Building and Safety (LADBS) can take another 2 to 4 months for review and approval. The City of Los Angeles aims to expedite ADU permits, but factors like workload and completeness of your application can affect timing.
- **Construction**: Building the ADU typically takes 6 to 12 months, though this can be shorter or longer based on contractor availability and supply chain factors.

### Common Pitfalls and How to Avoid Them

- **Incomplete Applications**: Ensure that all necessary documents and plans are complete before submission to avoid delays.
- **Ignoring Setbacks and Height Restrictions**: Ensure your design adheres strictly to these requirements to avoid costly redesigns.
- **Budget Overruns**: With a budget of $150,000, it’s crucial to factor in contingencies (typically 10-15% of your budget) to cover unexpected costs.

### Next Steps and Resources

1. **Consult with an Architect/Designer**: Hire someone experienced with Los Angeles ADUs to help refine your design and ensure compliance.
2. **Engage with a Local ADU Specialist**: This can streamline your process, especially someone familiar with LADBS and local zoning laws.
3. **Visit LADBS**: Regular visits or inquiries can keep you updated on your application status and help address any issues early.
4. **Community Resources**: Consider attending local workshops or connecting with neighborhood councils that might offer additional insights or support.

### Final Thoughts

Building an ADU in Los Angeles is a fantastic investment, both in terms of property value and family utility. By following the outlined steps and staying informed about local regulations and processes, you’ll be well on your way to a successful project.

If you have more questions or need further assistance, feel free to ask. Best of luck with your ADU journey!

Warm regards,

[Your Name]
ADU Consultant and Enthusiast

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Types of ADUs in Los Angeles, 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
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Garage Conversion

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

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JADU

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Upper Floor ADU

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Basement ADU

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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 Los Angeles.

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Why Build an ADU in Los Angeles?

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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Types of ADUs in Los Angeles, CA

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