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ADU Builders in San Bernardino, CA

51 builders · ranked by Google rating and review volume · 24 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 Bernardino 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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Located in San Bernardino County, San Bernardino had a 2020 Census population of about 222,101. We found 51 ADU builders and contractors that show up for San Bernardino homeowners on Google Maps, 10 of them based in the city itself. Their average Google rating is 4.9 stars. 18 market themselves specifically as ADU builders, and 1 mention garage conversions. 24 have a matched, active CSLB license shown with a verified badge. The top-rated by our review-weighted score are M.L. Construction, Storm Guard Construction Inc. and MDT, Inc.

Lots across San Bernardino County are often larger and land costs lower, which makes detached and prefab ADUs attractive. Foothill and mountain areas can face wildfire-zone construction requirements.

#1

M.L. Construction

5.0 (110 Google reviews)
✔ CSLB License Verified #902878

886 W Rialto Ave, Rialto, CA 92376

Serves San Bernardino · based in Rialto
Remodels & additions
CallWebsiteView profile
#3

MDT, Inc

5.0 (32 Google reviews)

6744 Magnolia Ave, Riverside, CA 92506

Serves San Bernardino · based in Riverside
Remodels & additionsGeneral contractor
CallWebsiteView profile
#4

Good Neighbor Construction

5.0 (25 Google reviews)
✔ CSLB License Verified #1134435

1255 W Colton Ave #589, Redlands, CA 92374

Serves San Bernardino · based in Redlands
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#8

Straight Edge Builders

4.9 (48 Google reviews)
✔ CSLB License Verified #1075936

301 9th St, Redlands, CA 92374

Serves San Bernardino · based in Redlands
Garage conversionsRemodels & additionsGeneral contractor
CallWebsiteView profile
#9

Khan Construction Co.

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

5802 Aurora Ave, Jurupa Valley, CA 91752

Serves San Bernardino · based in Jurupa Valley
Home builderGeneral contractor
CallWebsiteView profile
#13

JJ.Builders

5.0 (11 Google reviews)
✔ CSLB License Verified #1157031

Service-area business · Norco

Serves San Bernardino · based in Norco
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#18

Kirmina Construction

5.0 (8 Google reviews)
✔ CSLB License Verified #1144144

8615 Mesa Oak Dr, Riverside, CA 92508

Serves San Bernardino · based in Riverside
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#19

H5 Construction

4.8 (26 Google reviews)
✔ CSLB License Verified #1047863

1355 Spruce St W, San Bernardino, CA 92411

Based in San Bernardino
Remodels & additionsGeneral contractor
CallWebsiteView profile
#23

Brothers Superior

5.0 (5 Google reviews)

Service-area business · Banning

Serves San Bernardino · based in Banning
Home builderGeneral contractor
CallView profile
#29

M.E.A Construction Inc.

5.0 (3 Google reviews)
✔ CSLB License Verified #1007006

1394 Via Vista Dr, Riverside, CA 92506

Serves San Bernardino · based in Riverside
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#30

OSHI Construction Inc.

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

10722 Arrow Route Ste 304, Rancho Cucamonga, CA 91730

Serves San Bernardino · based in Rancho Cucamonga
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#31

RAW Construction & Design

5.0 (2 Google reviews)
✔ CSLB License Verified #1047610

9195 Peoria Ln, Moreno Valley, CA 92557

Serves San Bernardino · based in Moreno Valley
Home builderGeneral contractor
CallView profile
#32

USModular, Inc.

4.6 (39 Google reviews)

579 W County Line Rd, Calimesa, CA 92320

Serves San Bernardino · based in Calimesa
ADU specialistPrefab / modularHome builderGeneral contractor
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#34

R&R Improvements

4.6 (10 Google reviews)
✔ CSLB License Verified #1087664

16226 Windcrest Dr, Fontana, CA 92337

Serves San Bernardino · based in Fontana
Remodels & additionsHome builderGeneral contractor
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#40

ADU Makers

No rating yet (0 Google reviews)
✔ CSLB License Verified #1104137

3400 La Sierra Ave, Riverside, CA 92503

Serves San Bernardino · based in Riverside
ADU specialist
CallView profile
#41

Ironbridge ADU

No rating yet (0 Google reviews)

Service-area business · Upland

Serves San Bernardino · based in Upland
ADU specialistPrefab / modularHome builder
CallWebsiteView profile
#42

Hidden Peak Homes

No rating yet (0 Google reviews)

473 E Carnegie Dr #200, San Bernardino, CA 92408

Based in San Bernardino
Home builderGeneral contractor
CallView profile
#44

New ADU Home

No rating yet (0 Google reviews)

1702 Kippy Dr, Colton, CA 92324

Serves San Bernardino · based in Colton
ADU specialist
View profile
#49

Premier ADU

No rating yet (0 Google reviews)

Service-area business · Upland

Serves San Bernardino · based in Upland
ADU specialistGeneral contractor
CallWebsiteView profile
#51

Rehab Home Builders

No rating yet (0 Google reviews)

17130 Van Buren Boulevard #556, Riverside, CA 92504

Serves San Bernardino · based in Riverside
Home builder
CallView profile

Permits and pre-approved plans in San Bernardino

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

Planning an ADU in San Bernardino? Start here

SB 9 vs ADU: Lot Splits, Duplexes and Backyard Units in CaliforniaHow to Choose an ADU Builder in Southern California: 15-Point ChecklistThe ADU Permit Process in California: Step by Step (2026)Prefab and Modular ADUs in California: Real Costs, Permits and Pitfalls

All ADU guides →

San Bernardino ADU FAQ

How many ADU builders serve San Bernardino?

Our directory lists 51 ADU builders and contractors that appear for San Bernardino on Google Maps, including companies based in nearby San Bernardino County communities.

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

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

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 Bernardino 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 San Bernardino County

Fontana 83Ontario 54Rancho Cucamonga 31Victorville 16Rialto 56Hesperia 18Chino 49Upland 27Chino Hills 117Apple Valley 17Redlands 20Highland 8
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