ADU builder? The featured spot in your city is open. Call or text 424-298-3600

ADU Builders in Norco, CA

12 builders · ranked by Google rating and review volume · 6 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 Norco homeowners who are comparing builders right now. Includes your logo, project photos, a direct call button and a link to your website.

📞 Call 424-298-3600💬 Text 424-298-3600

With roughly 26,316 residents at the 2020 Census, Norco is one of Riverside County's established communities. We found 12 ADU builders and contractors that show up for Norco homeowners on Google Maps, most of them based in nearby communities. Their average Google rating is 4.9 stars. 4 market themselves specifically as ADU builders. 6 have a matched, active CSLB license shown with a verified badge. The top-rated by our review-weighted score are SouthSTAR Construction, MDT, Inc and SoCal ADU Pros, Inc.

Inland lots in Riverside County tend to be larger, which suits detached ADUs and multigenerational layouts. Summer heat makes insulation, roof design and HVAC sizing worth discussing with your builder.

#2

MDT, Inc

5.0 (32 Google reviews)

6744 Magnolia Ave, Riverside, CA 92506

Serves Norco · based in Riverside
Remodels & additionsGeneral contractor
CallWebsiteView profile
#6

JJ.Builders

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

Service-area business · Norco

Serves Norco · based in Norco
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#10

ADU Makers

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

3400 La Sierra Ave, Riverside, CA 92503

Serves Norco · based in Riverside
ADU specialist
CallView profile

Permits and pre-approved plans in Norco

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

Planning an ADU in Norco? Start here

Two-Story and Above-Garage ADUs in California: Height Rules, Costs and DesignADU Rental Income and Property Taxes in California: What to ExpectSB 9 vs ADU: Lot Splits, Duplexes and Backyard Units in CaliforniaPrefab and Modular ADUs in California: Real Costs, Permits and Pitfalls

All ADU guides →

Norco ADU FAQ

How many ADU builders serve Norco?

Our directory lists 12 ADU builders and contractors that appear for Norco on Google Maps, including companies based in nearby Riverside County communities.

Do I need a permit to build an ADU in Norco?

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

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 Norco 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 Riverside County

Riverside 54Moreno Valley 8Corona 32Murrieta 32Temecula 30Jurupa Valley 43Menifee 19Hemet 13Indio 4Perris 65Lake Elsinore 20Eastvale 26
📞 Call 424-298-3600💬 Text us