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ADU Builders in Fountain Valley, CA

65 builders · ranked by Google rating and review volume · 35 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 Fountain Valley 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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Fountain Valley is home to about 57,047 people (2020 Census) in Orange County. We found 65 ADU builders and contractors that show up for Fountain Valley homeowners on Google Maps, 2 of them based in the city itself. Their average Google rating is 4.9 stars. 16 market themselves specifically as ADU builders, and 1 mention garage conversions. 35 have a matched, active CSLB license shown with a verified badge. The top-rated by our review-weighted score are Ivy Builders Remodeling, DYM Builders Group and OC Builders Group.

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.

#3

OC Builders Group

5.0 (76 Google reviews)
✔ CSLB License Verified #1052090

600 W Santa Ana Blvd Ste 114-499, Santa Ana, CA 92701

Serves Fountain Valley · based in Santa Ana
General contractor
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#5

RG Contruction Pros

5.0 (27 Google reviews)
✔ CSLB License Verified #1014577

Service-area business · Fountain Valley

Serves Fountain Valley · based in Fountain Valley
General contractor
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#6

Modernyze

5.0 (26 Google reviews)
✔ CSLB License Verified #1019812

2323 Main St, Irvine, CA 92614

Serves Fountain Valley · based in Irvine
Remodels & additionsHome builderGeneral contractor
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#7

Look Wow Builders

5.0 (24 Google reviews)
✔ CSLB License Verified #1121005

1600 Dove St Ste 260, Newport Beach, CA 92660

Serves Fountain Valley · based in Newport Beach
Remodels & additionsHome builderGeneral contractor
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#9

HQ Remodeling & Design Inc

4.9 (70 Google reviews)
✔ CSLB License Verified #1041842

17011 Beach Blvd suite 900, Huntington Beach, CA 92647

Serves Fountain Valley · based in Huntington Beach
Remodels & additionsGeneral contractor
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#10

Anastasi Builders

5.0 (23 Google reviews)
✔ CSLB License Verified #1086383

8581 St Augustine Dr, Huntington Beach, CA 92646

Serves Fountain Valley · based in Huntington Beach
General contractor
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#11

AKF Construction Inc.

5.0 (23 Google reviews)
✔ CSLB License Verified #1086127

2102 Business Center Dr Ste. 142, Irvine, CA 92612

Serves Fountain Valley · based in Irvine
General contractor
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#15

WallStar Design & Build

5.0 (19 Google reviews)

21030 Pacific City Cir Unit 3207, Huntington Beach, CA 92648

Serves Fountain Valley · based in Huntington Beach
Design-buildRemodels & additionsGeneral contractor
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#17

Vulcon Builders

5.0 (18 Google reviews)
✔ CSLB License Verified #1128480

2082 Michelson Dr #100, Irvine, CA 92612

Serves Fountain Valley · based in Irvine
Remodels & additionsHome builderGeneral contractor
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#19

Titan Framing, Inc

5.0 (15 Google reviews)
✔ CSLB License Verified #1115866

9114 Adams Ave #171, Huntington Beach, CA 92646

Serves Fountain Valley · based in Huntington Beach
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#25

A&A Builder

4.9 (16 Google reviews)

Service-area business · Seal Beach

Serves Fountain Valley · based in Seal Beach
Remodels & additionsHome builder
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#26

VICOREL

5.0 (9 Google reviews)
✔ CSLB License Verified #1143460

2372 Morse Ave Ste 746, Irvine, CA 92614

Serves Fountain Valley · based in Irvine
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#31

Jordan remodeling

5.0 (8 Google reviews)
✔ CSLB License Verified #1125352

Service-area business · Laguna Beach

Serves Fountain Valley · based in Laguna Beach
Remodels & additionsGeneral contractor
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#35

MLR Construction Co

5.0 (4 Google reviews)
✔ CSLB License Verified #1108801

Service-area business · Fountain Valley

Serves Fountain Valley · based in Fountain Valley
Remodels & additionsHome builderGeneral contractor
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#43

Pelican ADU Builders

5.0 (2 Google reviews)
✔ CSLB License Verified #1106515

1924 Barranca Pkwy Unit 1, Irvine, CA 92606

Serves Fountain Valley · based in Irvine
ADU specialistGeneral contractor
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#45

Romans Builders

5.0 (2 Google reviews)
✔ CSLB License Verified #1149246

522 19th St, Huntington Beach, CA 92648

Serves Fountain Valley · based in Huntington Beach
Home builder
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#46

White Lotus Homes

5.0 (2 Google reviews)
✔ CSLB License Verified #1124683

650 Town Center Dr #1670, Costa Mesa, CA 92626

Serves Fountain Valley · based in Costa Mesa
Home builder
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#47

Epic Remodeling

4.5 (16 Google reviews)
✔ CSLB License Verified #1095347

17801 Main St, Irvine, CA 92614

Serves Fountain Valley · based in Irvine
Remodels & additions
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#52

Skye Construction

No rating yet (0 Google reviews)
✔ CSLB License Verified #1068435

1302 E Hunter Ave #C, Santa Ana, CA 92705

Serves Fountain Valley · based in Santa Ana
General contractor
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#53

Orange Innovation

No rating yet (0 Google reviews)
✔ CSLB License Verified #832810

15122 Starboard St, Garden Grove, CA 92843

Serves Fountain Valley · based in Garden Grove
General contractor
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#55

J&R ADU

No rating yet (0 Google reviews)

Service-area business · Fountain Valley

Serves Fountain Valley · based in Fountain Valley
ADU specialistPrefab / modularHome builder
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#60

OCADUSTUDIO

No rating yet (0 Google reviews)
✔ CSLB License Verified #1155045

13251 Pinto Rd, Garden Grove, CA 92843

Serves Fountain Valley · based in Garden Grove
ADU specialistGeneral contractor
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#61

Shore-Tech Builders LLC

No rating yet (0 Google reviews)
✔ CSLB License Verified #856735

8111 Wadebridge Cir, Huntington Beach, CA 92646

Serves Fountain Valley · based in Huntington Beach
Remodels & additionsHome builder
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Permits and pre-approved plans in Fountain Valley

ADU permits in Fountain Valley 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 Fountain Valley whether it has approved plans you can use. See our pre-approved plans guide and California ADU law summary.

Planning an ADU in Fountain Valley? Start here

Prefab and Modular ADUs in California: Real Costs, Permits and PitfallsThe ADU Permit Process in California: Step by Step (2026)How Long Does It Take to Build an ADU in Southern California?How Much Does It Cost to Build an ADU in Southern California?

All ADU guides →

Fountain Valley ADU FAQ

How many ADU builders serve Fountain Valley?

Our directory lists 65 ADU builders and contractors that appear for Fountain Valley on Google Maps, including companies based in nearby Orange County communities.

Do I need a permit to build an ADU in Fountain Valley?

Yes. ADUs need a building permit from the City of Fountain Valley, 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 Fountain Valley?

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 Fountain Valley 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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