ADU Construction in San Juan Capistrano, CA
An ADU is one of the smartest investments a homeowner in California can make right now. Whether you want rental income, a private space for a family member, or room that grows with your household, the right ADU changes what your property can do for you. ARC Construction handles ADU construction in San Juan Capistrano, CA with the same precision and care our family has delivered since 1991. We are fully licensed, CSLB #1006389, and we manage the design, permits, and complete build from the ground up. Call us at (949) 710-5062 or fill out the form below to get a free estimate.
What ADU Construction Actually Includes
Ground-Up Detached ADU
We build a fully independent structure on your property, separate from the main house. It gets its own entrance, its own kitchen, its own bathroom, and its own address for utility billing. This is the option that gives you the most flexibility for rental income or long-term multigenerational living.
Garage Conversion ADU
A detached garage that sits mostly empty is one of the most underused assets on a residential property. We convert it into a livable, permitted ADU without touching the main house footprint. The result is a finished living space that does not require you to give up any yard.
Attached ADU Addition
An attached ADU shares one wall with the main home but functions as a completely separate unit. It has its own entrance, its own kitchen, and its own living quarters. This option works well on lots where there is not enough room for a detached structure but the main house has usable perimeter space.
Junior ADU Conversion
A junior ADU, or JADU, is built from an existing room inside the main house, most often a bedroom or a converted attached garage. California law allows JADUs up to 500 square feet. This is the fastest and least expensive way to add a legal secondary unit to a property in San Juan Capistrano.
Signs Your Property Is Ready for an ADU
You Have an Empty Garage You Never Use
A detached or attached garage that holds bikes, old boxes, and not much else is already the size of a functional living space. Converting it costs less than building from the ground up and delivers a livable unit faster.
A Family Member Needs a Closer Living Arrangement
Adult children moving back, aging parents who need nearby support, or an in-law who wants independence without distance. An ADU puts them on your property without putting them inside your home.
Your Property Has Unused Yard Space
Lots in San Juan Capistrano vary widely. If your backyard has open space that is not being used for anything productive, a detached ADU turns that square footage into a rentable, income-producing asset.
You Are Looking for a Long-Term Rental Income Stream
South Orange County rental demand is strong. A permitted, well-built ADU in San Juan Capistrano commands real monthly rent. Homeowners use that income to offset their mortgage, fund other investments, or build savings over time.
Your Home Has Rooms That Are Sitting Empty
A large home with grown children who have moved out often has bedrooms that go unused for years. A junior ADU conversion puts that space to work without any exterior construction at all.
You Want to Increase the Resale Value of Your Property
A permitted ADU adds measurable value to a property at resale. Buyers in Orange County actively look for homes with ADUs because of the income potential and flexibility they offer.
Our ADU Construction Services in San Juan Capistrano
Every service below is handled in-house by our crew. No subcontracting chains, no middlemen.
Detached ADU Construction
Full ground-up build on your existing lot. Foundation, framing, roofing, plumbing, electrical, HVAC, interior finish, and landscaping repair included.
Garage Conversion ADU
Structural upgrades, insulation, drywall, kitchen build-out, bathroom rough-in and finish, flooring, windows, and a private entrance. Your garage becomes a complete living unit.
Attached ADU Addition
Framing tied into the main structure, shared utility connections where allowed by code, separate entrance, and a fully finished interior. Built to match the existing home's exterior.
Junior ADU Conversion
Interior conversion of an existing room or attached garage space. Kitchenette, bathroom, private entrance, and all permitted finishes within the California JADU size limits.
ADU Design and Permitting
We handle every drawing, submission, and revision with the City of San Juan Capistrano and Orange County. Site plans, floor plans, elevations, and structural calculations prepared and submitted by our team.
Pre-Construction Site Assessment
Before any plans are drawn, we walk your property and evaluate setbacks, utility connections, lot coverage limits, and the most practical ADU type for your specific parcel.
Here’s a look at the before and after of our work
Swipe to see the transformation!
Our ADU Construction Process
Six steps from first conversation to certificate of occupancy. Every step is tied to your specific property and project goals.
Free In-Home and Site Consultation
We visit your property, walk the lot with you, and talk through your goals. Rental income, family use, long-term investment. We listen first and then explain which ADU type fits your property and your budget. No commitment required at this stage.
Design Planning and 3D Preview
Our team prepares site plans, floor plan options, and exterior elevations. We present a 3D preview of the finished ADU so you can see exactly what you are getting before any permits are pulled. You review and approve the design before we move forward.
Permit Pulling and City Coordination
We prepare and submit every document required by the City of San Juan Capistrano. Plan check responses, utility coordination, structural calculations. We track the permit from submission to approval and handle every revision request from the city. You do not make a single call to the building department.
Site Prep and Foundation
We prepare the build site, handle any grading or drainage work needed, and pour the foundation. For garage conversions, this step covers structural reinforcement and subfloor work. The site is set up correctly before any framing begins.
Framing, Mechanical, and Finish Work
Framing goes up first, followed by rough plumbing, electrical, and HVAC. After inspections pass, insulation and drywall go in. Flooring, cabinets, fixtures, and all interior finishes are installed in sequence. No shortcuts on materials or methods.
Final Inspections and Certificate of Occupancy
We schedule every required inspection with the city and walk the inspector through the completed work. Once all inspections pass, we do a final walkthrough with you. We do not hand the project off until the certificate of occupancy is in hand and you are fully satisfied with the result.
Why Homeowners in San Juan Capistrano Choose Us
There are a lot of ADU construction contractors in South Orange County. Here is what makes ARC a different kind of company to work with.
Family-Owned Since 1991
Three generations. Tony and Joe are on every project. This is not a franchise that sends out whoever is available.
Licensed and Insured
CSLB #1006389, B General Building. Fully licensed for the structural, plumbing, and electrical work an ADU requires. Look it up.
3D Design Previews
Site plans, plan check submissions, city coordination, inspection scheduling. We manage every step of the permit process from start to certificate of occupancy.
We Handle All Permits
Permit pulling, inspections, code compliance. All of it.
Honest Pricing
A detailed written estimate before work starts. No change orders added mid-project without your sign-off. No surprise invoices at the end.
Bilingual Team
English and Spanish. Clear communication at every stage of a project that often takes several months to complete.
What Your Neighbors Say About Us
Homeowners across Coto de Caza, California trust us because we show up on time, listen close, and leave clean work behind. At ARC Construction, careful communication and quiet professionalism shape the whole remodeling experience. Every client we help sends a neighbor our way, and for a small family business, that customer trust means everything.
Serving San Juan Capistrano and Nearby Cities
We serve all of South Orange County. If you are in any of the cities below, we are your local ADU construction company.
Dana Point
Laguna Niguel
Mission Viejo
Lake Forest
Aliso Viejo
San Clemente
Ladera Ranch
Rancho Mission Viejo
Laguna Hills
Rancho Santa Margarita
Laguna Beach
Laguna Woods
Coto de Caza
Frequently Asked Questions
Common questions homeowners in San Juan Capistrano ask before starting a bathroom remodel.
How much does ADU construction in San Juan Capistrano cost?
ADU construction in San Juan Capistrano typically starts around $150,000 for a garage conversion and goes up from there depending on the size, type, and finish level of the unit. A ground-up detached ADU generally runs between $250,000 and $400,000 when all design, permitting, and construction costs are included. A junior ADU conversion is usually the least expensive option, often in the $60,000 to $100,000 range. We provide a free, detailed estimate based on your specific property before you commit to anything.
Do I need a permit to build an ADU in San Juan Capistrano?
Yes. All ADU construction in San Juan Capistrano requires permits through the city. California state law has streamlined the ADU approval process significantly in recent years, but permits are still required for every type of ADU, including junior ADU conversions. ARC Construction handles every permit application, plan check submission, and inspection coordination on your behalf. You do not deal with the city directly.
How long does it take to build an ADU?
The timeline varies by ADU type. A junior ADU conversion can be completed in 3 to 5 months from permit approval. A garage conversion typically runs 4 to 6 months. A ground-up detached ADU generally takes 8 to 14 months from design through certificate of occupancy, depending on the city's plan check timeline and construction complexity. We give you a realistic schedule at the start and communicate any changes right away.
Can I rent out my ADU in San Juan Capistrano?
Yes. A permitted ADU in San Juan Capistrano can be rented to a tenant on a long-term basis. California law prohibits cities from requiring owner occupancy on ADU rentals for units built after 2020. We recommend confirming current rental rules with a local real estate attorney before listing, as regulations can change.
What is the difference between an ADU and a JADU?
An ADU is a fully independent dwelling unit built on the same lot as a primary residence. It can be detached, attached, or a garage conversion, and there is no maximum size restriction under 1,200 square feet for most lots. A JADU, or junior ADU, is built entirely within the existing walls of the primary structure and is limited to 500 square feet under California law. JADUs are faster and less expensive to permit and build, but they offer less separation from the main home.
Does ARC Construction handle the design and permitting for ADUs?
Yes. Design, site planning, permit submissions, and city coordination are all part of our process. We prepare every drawing and document the city needs and manage the plan check process through to approval. You review and approve the design before any permits are filed.
Ready to Get Started on Your ADU in San Juan Capistrano?
Call ARC Construction at (949) 710-5062 or fill out the form below. We will schedule a free site consultation at a time that works for you. No pressure. No runaround. Just honest work from a family that has been doing this since 1991.
Talk To Us
(949)-710-5062
Location
26522 Briarwood Ln San Juan Capistrano, CA 92675
Business Hours
Mon - Sat: Open 8:00 am - 5:00 pm
Sunday: Closed
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