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“Have a Vision? We Build It Together.”
Have a question about our construction services, pricing, or ongoing projects? Our team is ready to assist you.
What is an ADU?
An Accessory Dwelling Unit (ADU) is a fully functional residential unit located on the same property as a primary home. ADUs typically include a kitchen, bathroom, living area, and a separate entrance. These units are one of the most valuable improvements homeowners can make to their property.
Typical ADU Investment Ranges
- Garage Conversion ADU: $50000 – $150,000
- Attached ADU: $80,000 – $250,000
- Detached ADU: $130,000 – $400,000+
Accessory Dwelling Unit (ADU) Guide for Southern California Homeowners
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FAM Promotions, Inc. DBA ACT Construction
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California Licensed General Contractor – License #883252
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Serving Southern California Since 1993
Fast-Track Permitting
california SB 543: Stop Waiting on City Hall: Our 2026 "Fast-Track" Process
Building an ADU or converting your garage in California just got faster. Thanks to Senate Bill 543, homeowners now have legal protection against bureaucratic delays. At ACT Construction, we leverage these new laws to get your project out of “permit limbo” and into construction.
The 15-Day “Completeness” GuaranteeUnder the new 2026 laws, the city no longer has months to “review” your paperwork.
15-Day Shot Clock:
Automatic Approval
If the city misses this 15-day window, your application is automatically deemed complete by law—starting the 60-day countdown to your permit approval.
No "Moving Goalposts
If the city asks for corrections, they must provide an exhaustive list. They cannot legally add new objections later in the process. Built-In Savings for Small ADUs.
Built-In Savings for Small ADUs
Are you looking to build a rental unit or a guest suite?
Zero School Fees
If your ADU is under 500 sq. ft. of interior livable space, you are now 100% exempt from school impact fees.More Livable Space: The 2026 laws now measure ADUs by interior space only. This means we can often build a larger footprint than before while still staying under the “fee-exempt” limits, potentially saving you $10,000+ in impact fees.
More Livable Space
The 2026 laws now measure ADUs by interior space only. This means we can often build a larger footprint than before while still staying under the “fee-exempt” limits, potentially saving you $10,000+ in impact fees.
Frequently Asked Questions
Areas We Serve
- Chino Hills
- Diamond Bar
- Yorba Linda
- Irvine
- Anaheim Hills
- Walnut
- San Dimas
- Rancho Cucamonga
- Claremont
- Upland
Garage Conversion ADU
Convert an existing garage into a modern living unit including a kitchen, bathroom, and living space.
Attached ADU
An extension to the existing home that includes a separate entrance and full living space.
Our ADU Development Process
- Property evaluation and feasibility consultation
- Architectural design and planning
- Permit preparation and city approvals
- Full construction management
- Final inspection and project completion
Detached ADU
A completely independent structure built in the backyard providing privacy and long-term rental opportunities.
Junior ADU (JADU)
A smaller ADU created within the existing home footprint, often utilizing unused interior space.
