ADU Design & Construction in Los Angeles
Build Your ADU with
LA's Trusted Contractor
From backyard homes to garage conversions, CCS Inc handles every step — design, permits, and construction — so you can add value to your property with confidence.
500+
ADUs Built
40+
Years in LA
5.0
Yelp Rating
100%
Permit Success
ADU Options
Types of ADUs We Build
Every property is different. We design and build all four types of accessory dwelling units permitted under California law.
Detached ADU
A standalone structure in your backyard — up to 1,200 sq ft with full kitchen and bath. Ideal for rental income or family.
Most Popular
Attached ADU
An addition connected to your main house — shares a wall but has its own private entrance, kitchen, and bathroom.
Space Efficient
Garage Conversion
Convert your existing garage into a legal dwelling unit. The most cost-effective ADU option — no new foundation needed.
Best Value
Junior ADU (JADU)
Up to 500 sq ft within your existing home. Requires an efficiency kitchen and can share a bathroom with the main house.
Lowest Cost
Free Resources
Not Sure Where to Start?
Enter an address below to instantly check ADU eligibility, permits, zoning, and more.
ADU Eligibility Checker
Find out if your property qualifies for an ADU under current LA zoning rules.
SearchGarage Conversion Checker
See if your garage can be legally converted to a living space or ADU.
SearchUnpermitted Work Checker
Detect unpermitted additions and modifications on any property.
SearchPermit Search
View all building permits on file, both active and historical.
SearchZoning Lookup
Get complete zoning details, overlay zones, and land use information.
Search
Benefits
Why Build an ADU?
An ADU is one of the smartest investments a Los Angeles homeowner can make. Here's why.
Rental Income
Generate $1,500–$3,500+ per month in rental income. Many ADUs pay for themselves within 5–8 years through consistent cash flow.
Increase Property Value
A permitted ADU can add $150,000–$450,000+ to your property value — often exceeding the cost to build it.
Multi-Generational Living
Keep aging parents or adult children close while maintaining privacy. An ADU provides independent living on the same property.
Streamlined Permitting
California state law (SB 13, AB 68, AB 1332) has removed most barriers — no lot splits, no owner-occupancy requirements, reduced fees.
No Parking Required
If your property is within half a mile of public transit, no replacement parking is required for your ADU — a major advantage in LA.
Flexible Use
Use your ADU as a rental, home office, guest house, studio, or caregiver suite. The space adapts to your life as needs change.
See how an ADU fits your property.
Check My Eligibility
Our Process
How We Build Your ADU
A clear, step-by-step process from your first call to handing you the keys. No surprises, no runaround.
1
Free Consultation & Site Visit
We visit your property, evaluate zoning and setback requirements, discuss your goals, and provide an honest feasibility assessment at no cost.
Week 1Check if your property qualifies
2
Design & Engineering
Our in-house team creates architectural plans, structural engineering, Title 24 energy calculations, and all required construction documents.
Weeks 2–63
Permit Expediting
We submit plans to LADBS and handle plan check corrections, fire department review, and all agency approvals. We know the system inside and out.
Weeks 6–14Estimate your permit timeline
4
Construction
Our licensed crews handle all construction — foundation, framing, electrical, plumbing, HVAC, drywall, flooring, and finishes. Weekly progress updates included.
Weeks 14–30Get an idea of your ADU costs
5
Inspections & Move-In
We coordinate all city inspections, obtain your Certificate of Occupancy, and hand you the keys to your brand-new, fully legal ADU.
Weeks 30–34Ready to start? Your first consultation is free.
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Investment
ADU Cost Breakdown
Transparent pricing so you know what to expect. Every project includes design, permits, and full construction.
Garage Conversion
$85K – $215K
Convert your existing garage into a legal ADU
- No new foundation needed
- Full kitchen & bathroom
- Electrical & plumbing upgrades
- HVAC, insulation & drywall
- Permits & inspections included
Detached ADU
$120K – $380K
New standalone structure in your backyard
- Up to 1,200 sq ft
- Custom floor plan & design
- Full foundation & framing
- All utilities & connections
- Solar panels & fire sprinklers
Junior ADU
$35K – $150K
Convert existing space within your home
- Up to 500 sq ft
- Efficiency kitchen
- Can share bathroom
- Separate entrance
- Minimal structural changes
Costs vary based on lot conditions, finish level, and overall scope of work. Get a free estimate for your specific property.
*All prices shown are estimates and subject to a visual site assessment to confirm access, existing conditions, and other project-specific requirements.
500+ ADUs Built
Why Choose CCS
Start My ADU Project
LA's Full-Service ADU Contractor
Unlike companies that only design plans or only do construction, CCS handles everything under one roof — from the initial site visit through final inspection. That means fewer delays, no finger-pointing between vendors, and a single point of contact from start to finish.
In-House Design
Architecture & engineering
Permit Experts
We navigate LADBS for you
Licensed Builder
CSLB #B1047699
Bonded & Insured
Full protection for your project
Our Work
ADU Projects by CCS Inc
Real ADUs we have designed and built for Los Angeles homeowners.
Detached ADU — Encino
ADU Kitchen — 1,200 Sq Ft Unit
Attached ADU — Cedar Accent
2-Bed / 2-Bath ADU — Van Nuys
Detached ADU — Backyard Build
ADU Master Bathroom — Tarzana
Like what you see? Let's design yours.
Start My ADU Project
Client Reviews
What ADU Clients Say
Real reviews from LA homeowners who trusted CCS to build their ADU.
"Words simply can't express the level of appreciation we have for Danny at CCS Inc as they converted our unused garage space into an accessory dwelling unit. From design to financing and permitting to the project execution, every aspect of our project was well taken care of."
"The best part about this business was how easy they made the whole process. They broke down the steps for me in a way that made sense and kept me in the loop from day one. The craftsmanship on the cabinets and flooring is top notch. My garage looks nothing like it did before."
"CCS built us a beautiful 800 sq ft detached ADU in our backyard. The entire process — from pulling permits to the final walk-through — took about 9 months. Communication was excellent and the finished product exceeded our expectations. Already renting it out!"
Join 500+ LA homeowners who built with CCS.
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Common Questions
ADU Frequently Asked Questions
Answers to the questions LA homeowners ask most about building an ADU.
In 2025–2026, the cost to build a new detached ADU in Los Angeles typically ranges from $120,000 to $380,000, while a garage-to-ADU conversion generally runs $85,000 to $215,000 depending on scope. Construction costs average $300–$400 per square foot, and soft costs (architectural plans, engineering, permits) add another $15,000–$45,000. Key factors include ADU type, lot conditions, finish level, and state-mandated requirements like solar panels and fire sprinklers.
The total timeline from initial consultation to move-in typically ranges from 9 to 18 months for a new detached ADU. This includes 4–6 weeks for design, 2–4 months for permits (faster with pre-approved plans under AB 1332), and 4–6 months for construction. Garage conversions are generally faster — about 6 to 10 months total — since they use an existing structure.
In most cases, yes. California state law (AB 68, SB 13, AB 881) allows at least one ADU on any residential lot in the state. For single-family properties in LA, you can typically build one ADU plus one JADU. Multifamily properties can add up to two detached ADUs plus additional converted units. Use our free ADU Eligibility Checker to see what your property qualifies for.
No. California eliminated the owner-occupancy requirement for ADUs through January 1, 2025, and many local jurisdictions have permanently removed it. For standard ADUs in Los Angeles, you are not required to live on the property. JADUs may still have owner-occupancy requirements depending on local regulations.
Under California law, a detached ADU can be up to 1,200 square feet on a single-family lot (850 sq ft for studios/one-bedrooms). Attached ADUs are limited to 50% of the main home's floor area or 1,200 sq ft, whichever is less. Junior ADUs (JADUs) can be up to 500 square feet within the existing home. Garage conversions can be up to 1,200 sq ft or the size of the existing garage, whichever is larger.
In most cases in Los Angeles, no. Replacement parking is not required if your property is within half a mile of a public transit stop (bus, rail, etc.), which covers most of LA. It is also not required for garage conversions, properties in historic districts, or when an on-street parking permit is available. Even when parking is required, only one space per ADU is needed.
Yes. If the unpermitted conversion was completed before January 1, 2020, California's AB 2533 (effective 2025) provides an amnesty pathway with waived impact fees if the unit passes a health-and-safety inspection. For conversions built after that date, a retroactive "as-built" permit may be needed. CCS specializes in legalizing unpermitted work — contact us for a free assessment.
We handle everything. CCS is a full-service design-build firm — we do the architectural design, structural engineering, permit expediting, construction, inspections, and final sign-off. You get a single point of contact and a single contract. No need to hire separate architects, engineers, expediters, or subcontractors.
Still have questions? Talk to an ADU expert.
Call (323) 405-8909Ready to Build Your ADU?
Your free consultation is just a phone call away. Let's discuss what's possible on your property.
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