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ADU Builders in Aliso Viejo, CA

22 builders · ranked by Google rating and review volume · 8 CSLB license verified

★ Featured ADU builder

Featured ADU builder — this spot is open

Put your ADU company at the top of this page, in front of Aliso Viejo homeowners who are comparing builders right now. Includes your logo, project photos, a direct call button and a link to your website.

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Aliso Viejo is home to about 52,176 people (2020 Census) in Orange County. We found 22 ADU builders and contractors that show up for Aliso Viejo homeowners on Google Maps, most of them based in nearby communities. Their average Google rating is 4.8 stars. 8 market themselves specifically as ADU builders, and 1 mention garage conversions. 8 have a matched, active CSLB license shown with a verified badge. The top-rated by our review-weighted score are Renovex Construction, Sea Pointe Design & Remodel and Horizon Construction Laguna Hills (Construction & Remodeling).

In Orange County, HOA and design-standard questions come up often. State law voids CC&Rs that ban ADUs, but HOAs can still apply reasonable objective standards. Compact lots make attached units and garage conversions popular.

#5

D2A Construction

4.9 (36 Google reviews)
✔ CSLB License Verified #1122027

23121 Plaza Pointe Dr Ste 105, Laguna Hills, CA 92653

Serves Aliso Viejo · based in Laguna Hills
CallWebsiteView profile
#6

OC Quality Builders

4.9 (30 Google reviews)
✔ CSLB License Verified #1148925

22981 Triton Way Unit C, Laguna Hills, CA 92653

Serves Aliso Viejo · based in Laguna Hills
Remodels & additionsHome builderGeneral contractor
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#12

Excel Design & Build

5.0 (6 Google reviews)
✔ CSLB License Verified #956734

25108 Marguerite Pkwy STE. A #4, Mission Viejo, CA 92692

Serves Aliso Viejo · based in Mission Viejo
Design-buildGeneral contractor
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#14

Plus Home ADU

5.0 (3 Google reviews)
✔ CSLB License Verified #1062063

Service-area business · Aliso Viejo

Serves Aliso Viejo · based in Aliso Viejo
ADU specialistRemodels & additionsHome builderGeneral contractor
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#16

CCS ADU Services

5.0 (2 Google reviews)

Service-area business · San Clemente

Serves Aliso Viejo · based in San Clemente
ADU specialistHome builder
CallView profile
#20

DWELLO ADU INC

5.0 (1 Google reviews)

23361 Madero Ste 235, Mission Viejo, CA 92691

Serves Aliso Viejo · based in Mission Viejo
ADU specialistGeneral contractor
CallWebsiteView profile

Permits and pre-approved plans in Aliso Viejo

ADU permits in Aliso Viejo go through the city's building or planning department. Under AB 1332, every California city and county had to set up a pre-approved ADU plan program by January 1, 2025, so ask Aliso Viejo whether it has approved plans you can use. See our pre-approved plans guide and California ADU law summary.

Planning an ADU in Aliso Viejo? Start here

How to Legalize an Unpermitted ADU in California (AB 2533)Garage Conversion ADU Cost in Southern California (and What Drives It)How to Choose an ADU Builder in Southern California: 15-Point ChecklistADU Rental Income and Property Taxes in California: What to Expect

All ADU guides →

Aliso Viejo ADU FAQ

How many ADU builders serve Aliso Viejo?

Our directory lists 22 ADU builders and contractors that appear for Aliso Viejo on Google Maps, including companies based in nearby Orange County communities.

Do I need a permit to build an ADU in Aliso Viejo?

Yes. ADUs need a building permit from the City of Aliso Viejo, which must approve or deny a complete application within 60 days under state law. Many cities also offer pre-approved plans that speed up review.

How much does an ADU cost in Aliso Viejo?

Most Southern California detached ADUs land around $350 to $550 per square foot all-in, garage conversions around $200 to $350, and JADUs around $50,000 to $150,000. Use our ADU cost estimator and get three itemized bids.

How are Aliso Viejo ADU builders ranked here?

By Google rating weighted by the number of reviews, so a 4.9 with 200 reviews ranks above a 5.0 with 3. Featured placements are clearly labeled and don't affect the organic ranking.

Nearby cities in Orange County

Anaheim 114Santa Ana 97Irvine 107Huntington Beach 88Garden Grove 97Fullerton 23Orange 95Costa Mesa 103Mission Viejo 59Westminster 53Lake Forest 60Newport Beach 96
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