Attached ADU
Expand Your Home with a Connected Living Unit
About Our 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.
Why Choose CCS for Attached ADU?
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
How It Works
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
Free Property Tools
Use our free online tools to research your property and explore your options.
Related Services
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Ready to Get Started?
Schedule a free consultation with our attached adu experts. We'll assess your project and provide a detailed plan.
