If my LA multifamily building has 20 units, how many attached State ADUs can I add by converting unused spaces like attics or basements?

Amy C.
June 15, 2025 at 11:19 PM
Construction Los Angeles, CA
Title: Converting Unused Spaces into ADUs in LA - How Many Can I Add?

Hey everyone,

I'm looking into maximizing the potential of my 20-unit multifamily building here in Los Angeles by converting some unused spaces like attics or basements into attached State ADUs. I'm curious about how many of these I can actually add. I've heard there might be specific regulations or limits for LA, but I'm not sure of the details. Has anyone here done something similar? Any tips or insights on the process or what to consider would be super helpful. Thanks in advance for any advice you can share!

Cheers,
Amy

1 Answer

Nick (GatherADU Team)
June 16, 2025 at 05:19 PM
Hey, Nick from GatherADU! With a 20-unit multifamily building, you can add up to 5 attached State ADUs (25% of 20 units) by converting non-livable spaces like attics or basements, or at least 1 if that’s more practical, per the ZA Memo. These ADUs are exempt from local zoning, so parking or open space rules won’t apply. Want us to assess your building’s potential? Let’s talk!
Didn't find what you're looking for?

Need help with ADU plans, permits, or finding contractors? Our experts are here to guide you through the entire process.

Book Free Call
or call: (323) 591-3717
Your Answer
Email will not be displayed publicly
Provide a helpful, detailed answer. Be respectful and constructive.
CAPTCHA
Enter the characters shown above
* Required fields

Popular ADU Floor Plans

Explore our most popular ADU designs that work well in Los Angeles, 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?

Browse our complete collection of ADU floor plans with detailed specifications, 3D renderings, and customization options.

View All Floor Plans

Complete Guide to Construction ADUs in Los Angeles, CA

Understanding Construction for ADU Projects

ADU construction in Los Angeles, CA requires careful coordination of multiple trades, materials management, and adherence to local building codes. Quality construction ensures your ADU will be durable, efficient, and valuable for years to come.

Key construction considerations include foundation requirements, framing specifications, electrical and plumbing systems, insulation standards, and finish quality. Local climate conditions and building practices influence many construction decisions.

Selecting qualified contractors with ADU experience is crucial for project success. Look for builders who understand local requirements and have a track record of quality workmanship and timely completion.

Construction Requirements in Los Angeles, CA

Local regulations in Los Angeles, CA have specific requirements that affect ADU development. Understanding these local nuances is crucial for project success and compliance.

Los Angeles has 102 ADU-related questions in our database, indicating active development interest in your area. This local activity suggests growing expertise among contractors, architects, and city officials familiar with ADU projects.

Common considerations for Los Angeles include local architectural standards, historical district requirements if applicable, utility connection procedures, and neighborhood-specific zoning overlays that may affect your project.

Expert Insights on Construction

The GatherADU team has helped hundreds of homeowners navigate construction challenges successfully. Our experience reveals common patterns, effective strategies, and potential pitfalls to avoid.

Professional consultation early in your project can prevent costly mistakes and delays. We've seen how proper planning in the construction phase saves both time and money throughout the entire ADU development process.

Our database contains 32 questions related to Construction, with 40 expert answers providing comprehensive guidance for homeowners facing similar challenges.

Ready to Move Forward with Your ADU Project?

Don't let construction challenges delay your ADU dreams. Our experts can provide personalized guidance specific to your situation in Los Angeles, CA.

More Construction Questions & Answers

Explore additional construction questions from our community to gain deeper insights into ADU development challenges and solutions.

Can I build an ADU in Santa Monica with a pre-2018 unpermitted JADU?
Santa Monica, CA 1 answers

I'm planning an ADU in Santa Monica and need clarification on JADU regulations. My architect mention...

June 22, 2025
Can I build an ADU in Santa Monica with an unpermitted 2019 structure?
Santa Monica, CA 1 answers

Looking for some advice on unpermitted structure conversions for my Santa Monica ADU. This is my fir...

June 22, 2025
Can I convert a 2017 unpermitted storage room in Santa Monica into an ADU?
Santa Monica, CA 1 answers

I'm working with contractors on my Santa Monica ADU and a question came up about storage room conver...

June 22, 2025
Can I build a JADU in Santa Monica as a new construction addition?
Santa Monica, CA 1 answers

Looking for some advice on new construction JADUs for my Santa Monica ADU. My neighbors had some que...

June 22, 2025
Can I build an ADU in Burbank with a ground-mounted AC unit?
Burbank, CA 1 answers

Hey folks, I have a question about ADU regulations for my Burbank ADU project. I've heard different ...

June 22, 2025
Can I build an ADU in Burbank with a street-facing entrance if not visible?
Burbank, CA 1 answers

I'm working on an ADU project in Burbank and have a specific question about ADU regulations. I want ...

June 22, 2025
Can I build an ADU in Burbank's R-2 zone with a roof-mounted AC unit?
Burbank, CA 1 answers

I'm designing an ADU in an R-2 zone in Burbank and trying to figure out the best HVAC solution. A ro...

June 22, 2025
Can I build an ADU in Burbank without a 5-foot building separation?
Burbank, CA 1 answers

Hi everyone! I'm working on an ADU project in Burbank and have a specific question about ADU regulat...

June 22, 2025

ADU Questions from Los Angeles, CA

Discover how other homeowners in Los Angeles, CA are approaching their ADU projects. Local insights can provide valuable context for your own planning.

test 234
Permits & Regulations 0 answers

testing 456

June 23, 2025
ADU permit timeline in Los Angeles - what to expect?
Permits & Regulations 2 answers

We're planning to convert our detached garage into an ADU in LA. The garage is about 400 sq ft and w...

June 21, 2025
How do I check if my LA ADU project vested under old rules before the 2019 ADU Ordinance, and can I switch to new rules?
General Advice 1 answers

How do I check if my LA ADU project vested under old rules before the 2019 ADU Ordinance, and can I ...

June 20, 2025
Can I build a Movable Tiny House as an ADU in LA without following building code rules for regular structures, and what standards still apply?
Construction 2 answers

Hey everyone! I'm looking into building a tiny house on wheels as an ADU in my backyard here in LA....

June 19, 2025
Can I turn a storage room in my LA multifamily building into a State ADU without worrying about local parking or open space rules?
Parking & Access 1 answers

Hey everyone! So I'm thinking about converting a storage room in my multifamily building in LA into ...

June 18, 2025
If I build an ADU in LA and later add a new non-ADU structure, will passageway rules apply to the ADU retroactively?
General Advice 2 answers

If I build an ADU in LA and later add a new non-ADU structure, will passageway rules apply to the AD...

June 15, 2025

Related ADU Questions

These questions share similar topics or locations and may provide additional insights for your ADU project.

test 234
Permits & Regulations Los Angeles, CA
0 answers Jun 23, 2025
Can I build an ADU in Santa Monica with a pre-2018 unpermitted JADU?
Construction Santa Monica, CA
1 answers Jun 22, 2025
Can I build an ADU in Santa Monica with an unpermitted 2019 structure?
Construction Santa Monica, CA
1 answers Jun 22, 2025
Can I convert a 2017 unpermitted storage room in Santa Monica into an ADU?
Construction Santa Monica, CA
1 answers Jun 22, 2025
Can I build a JADU in Santa Monica as a new construction addition?
Construction Santa Monica, CA
1 answers Jun 22, 2025

ADU Development Checklist for Los Angeles, CA

Use this comprehensive checklist to ensure you don't miss important steps in your ADU development process.

Planning Phase
  • Define project goals and budget
  • Research local zoning requirements
  • Evaluate site conditions and constraints
  • Consult with ADU experts
  • Develop preliminary design concepts
Pre-Construction
  • Finalize architectural plans
  • Submit permit applications
  • Select qualified contractors
  • Secure financing if needed
  • Schedule utility connections
Construction Phase
  • Site preparation and excavation
  • Foundation and framing work
  • Rough-in electrical and plumbing
  • Insulation and drywall installation
  • Interior and exterior finishes
Completion
  • Final inspections and approvals
  • Certificate of occupancy
  • Utility meter installation
  • Final walkthrough and cleanup
  • Property insurance updates
Need Help with Your ADU Checklist?

Our experts can provide personalized guidance for each phase of your Los Angeles ADU project, ensuring nothing falls through the cracks.

Get Expert Project Guidance
Get Expert Help

Stuck on your ADU project? Get personalized guidance from our experts.

Free 15-minute consultation available
Related Topics
Construction Los Angeles ADU Planning Permits
Los Angeles, CA

This question is specific to Los Angeles, CA

Local regulations may vary by jurisdiction. Always verify with your local planning department.