ADU Services
Attached ADU in Los Angeles
Expand Your Home with a Connected Living Unit
An attached ADU is built as an addition to your existing home, sharing at least one wall with the primary structure. This is an excellent option for homeowners who want to add living space without sac...
20+Years Experience
2,500+Projects Completed
3Counties Served
4.9Star Rating
About This Service
Attached ADU Services
An attached ADU is built as an addition to your existing home, sharing at least one wall with the primary structure. This is an excellent option for homeowners who want to add living space without sacrificing backyard area or dealing with the higher costs of an entirely new foundation. Attached ADUs can be up to 1,000 square feet or 50% of your existing home's floor area, whichever is less, under current California law.
CCS Inc. designs attached ADUs that integrate seamlessly with your existing home's architecture while maintaining separate entrances, kitchens, and bathrooms for full independence. Our structural engineers ensure the addition meets all seismic and load requirements, and our architects create designs that look like they were always part of the original home.
Attached ADUs are often the most cost-effective new-construction ADU option because they share a wall (and sometimes utilities) with the main home, reducing foundation, roofing, and connection costs by 15-25% compared to detached units. They are especially popular on smaller lots where setback requirements make a detached unit impractical.
Key Highlights
- Lower construction cost than detached ADUs - shared wall reduces materials
- Preserves backyard and outdoor living space
- Easier utility connections to existing home infrastructure
Why Choose CCS
Why Choose CCS for Attached ADU?
Every project benefits from our 20+ years of experience, deep relationships with local building departments, and commitment to getting it done right.
Lower construction cost than detached ADUs - shared wall reduces materials
Preserves backyard and outdoor living space
Easier utility connections to existing home infrastructure
Seamless architectural integration with your existing home
Ideal for smaller lots where setbacks limit detached options
Separate entrance maintains privacy for both households
Our Process
How It Works
Our proven process keeps your project on track from initial consultation through final completion.
1
Site evaluation to determine the best attachment point and layout
2
Architectural plans designed to match your home's style and roofline
3
Structural engineering for seismic compliance and load analysis
4
Permit processing through LADBS or your local building department
5
Construction with minimal disruption to your daily routine
Real Estate Tools
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
Resources
Latest Resources & Guides
Stay informed with the latest construction, compliance, and ADU news for Los Angeles homeowners.
Rebuilding After the LA Wildfires: ADU Rules & Fire Rebuild Permits
What homeowners need to know in 2026 about rebuilding after wildfire damage, including ADU additions during the rebuild process.
Read More →Complete Guide to California's 2026 ADU Laws
AB 462, AB 1154, SB 9, and SB 543 explained - how the latest legislation affects your property and construction options.
Read More →How to Legalize Unpermitted Work Before Selling
2026 guide for Los Angeles homeowners covering the remediation process, costs, and timeline for legalizing unpermitted construction.
Read More →Tariffs & Construction Costs in 2026
What to budget for ADU and remodeling projects given current material costs, tariffs, and labor market conditions in Los Angeles.
Read More →
FAQ
Frequently Asked Questions
Common questions about our attached adu services in Los Angeles.
How much does a Attached ADU cost in Los Angeles?
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Costs vary depending on size, complexity, and finish level. Contact CCS for a free project assessment and detailed cost estimate tailored to your property and goals.
How long does the Attached ADU process take from start to finish?
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Timelines depend on project scope and local building department processing times. CCS manages every phase to minimize delays and keep your project on schedule.
Do I need a permit for a Attached ADU project?
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Yes. All ADU construction in California requires building permits. CCS handles the entire permit process including plan preparation, submission, plan check corrections, and inspection coordination.
Will a Attached ADU increase my property value?
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ADUs are one of the highest-ROI home improvements in Los Angeles. Most homeowners see significant property value increases and can generate substantial monthly rental income upon completion.
Does CCS handle the entire Attached ADU project or just part of it?
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CCS provides full-service delivery from initial consultation and design through permitting, construction, and final Certificate of Occupancy. We manage every step so you do not have to.
Get Started Today
Ready to Get Started?
Schedule a free consultation with our attached adu experts. We will assess your project and provide a clear plan with realistic costs and timelines.
Or call us directly: (323) 405-8909
