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ADU Builders in San Dimas, CA

57 builders · ranked by Google rating and review volume · 25 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 San Dimas 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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With roughly 34,924 residents at the 2020 Census, San Dimas is one of Los Angeles County's established communities. We found 57 ADU builders and contractors that show up for San Dimas homeowners on Google Maps, 6 of them based in the city itself. Their average Google rating is 4.8 stars. 20 market themselves specifically as ADU builders, and 1 mention garage conversions. 25 have a matched, active CSLB license shown with a verified badge. The top-rated by our review-weighted score are JNC Construction, Prime Team Builders, Inc. and Skilled Home Builders.

Los Angeles leads California in ADU permits. Common projects here include garage conversions on older lots, detached backyard units on deep lots, and hillside sites where access and grading drive the cost.

#1

JNC Construction

5.0 (143 Google reviews)

9360 Base Line Rd Ste H, Rancho Cucamonga, CA 91701

Serves San Dimas · based in Rancho Cucamonga
Remodels & additionsHome builderGeneral contractor
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#5

St Paul Contracting

5.0 (25 Google reviews)
✔ CSLB License Verified #1104071

9650 Business Center Dr Bldg 17, Suite 131, Rancho Cucamonga, CA 91730

Serves San Dimas · based in Rancho Cucamonga
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#9

Khan Construction Co.

4.9 (37 Google reviews)
✔ CSLB License Verified #700519

5802 Aurora Ave, Jurupa Valley, CA 91752

Serves San Dimas · based in Jurupa Valley
Home builderGeneral contractor
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#11

Backyard Estates

4.9 (30 Google reviews)
✔ CSLB License Verified #1076065

2335 W Foothill Blvd #18, Upland, CA 91786

Serves San Dimas · based in Upland
Home builder
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#12

Capy Construction

5.0 (15 Google reviews)
✔ CSLB License Verified #1120565

Service-area business · Walnut

Serves San Dimas · based in Walnut
Remodels & additionsHome builderGeneral contractor
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#13

Lopez United Inc

5.0 (14 Google reviews)
✔ CSLB License Verified #841932

11991 Silicon Ave, Chino, CA 91710

Serves San Dimas · based in Chino
Remodels & additionsHome builderGeneral contractor
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#15

Salem Builders

5.0 (13 Google reviews)

Service-area business · Montclair

Serves San Dimas · based in Montclair
Remodels & additionsHome builderGeneral contractor
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#24

The ADU Company

5.0 (6 Google reviews)
✔ CSLB License Verified #1118354

504 E Navilla Pl, Covina, CA 91723

Serves San Dimas · based in Covina
ADU specialistRemodels & additionsHome builderGeneral contractor
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#34

ADU Experts

5.0 (3 Google reviews)

Service-area business · Azusa

Serves San Dimas · based in Azusa
ADU specialistGeneral contractor
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#35

B & D Construction

4.7 (13 Google reviews)
✔ CSLB License Verified #409057

1472 Avenida Loma Vista, San Dimas, CA 91773

Based in San Dimas
Remodels & additionsHome builderGeneral contractor
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#38

OSHI Construction Inc.

5.0 (2 Google reviews)
✔ CSLB License Verified #990408

10722 Arrow Route Ste 304, Rancho Cucamonga, CA 91730

Serves San Dimas · based in Rancho Cucamonga
Remodels & additionsHome builderGeneral contractor
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#50

CalHome ADU

1.0 (1 Google reviews)

2540 Fulton Rd, Pomona, CA 91767

Serves San Dimas · based in Pomona
ADU specialistGeneral contractor
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#51

JLF ADU

No rating yet (0 Google reviews)
✔ CSLB License Verified #1075968

4716 N Fircroft Ave, Covina, CA 91722

Serves San Dimas · based in Covina
ADU specialist
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#55

Ironbridge ADU

No rating yet (0 Google reviews)

Service-area business · Upland

Serves San Dimas · based in Upland
ADU specialistPrefab / modularHome builder
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#57

Premier ADU

No rating yet (0 Google reviews)

Service-area business · Upland

Serves San Dimas · based in Upland
ADU specialistGeneral contractor
CallWebsiteView profile

Permits and pre-approved plans in San Dimas

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

Planning an ADU in San Dimas? Start here

How to Legalize an Unpermitted ADU in California (AB 2533)Two-Story and Above-Garage ADUs in California: Height Rules, Costs and DesignSB 9 vs ADU: Lot Splits, Duplexes and Backyard Units in CaliforniaGarage Conversion ADU Cost in Southern California (and What Drives It)

All ADU guides →

San Dimas ADU FAQ

How many ADU builders serve San Dimas?

Our directory lists 57 ADU builders and contractors that appear for San Dimas on Google Maps, including companies based in nearby Los Angeles County communities.

Do I need a permit to build an ADU in San Dimas?

Yes. ADUs need a building permit from the City of San Dimas, 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 San Dimas?

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 San Dimas 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 Los Angeles County

Los Angeles 118Long Beach 119Santa Clarita 27Glendale 117Lancaster 12Palmdale 12Pomona 67Torrance 98Pasadena 100Downey 28West Covina 68El Monte 24
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