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ADU Builders & Contractors in Riverside, CA

Riverside County's free Permit Ready ADU program provides pre-approved plans at no cost, making it one of the most accessible ADU markets in Southern California. Construction runs $200–$350 per square foot — significantly below coastal pricing. The Inland Empire's hot, dry climate means minimal rain delays but requires robust cooling systems. An ADU contractor in Riverside can take most projects from permit to occupancy in 6–9 months.

📊 ADU Quick Facts for Riverside

Avg. Cost/sqft

$200-$400

Permit Timeline

4-10 weeks

Max Size

1200 sqft

Setbacks

4ft sides

View Riverside Planning Department →

Top 925 ADU Contractors in Riverside

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#1TOMMY DINH NGUYEN

Riverside, CA

Tommy Dinh Nguyen — licensed ADU contractor in Riverside, CA. Detached ADU construction. 14+ years experience.

View Profile📞 (714) 487 8876
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#2BURRELL DONALD SHERWIN

Riverside, CA

Burrell Donald Sherwin — licensed ADU contractor in Riverside, CA. Detached ADU construction. 31+ years experience.

View Profile📞 (951) 201 6786
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#3DESANDE ELECTRIC

Riverside, CA

Desande Electric — licensed ADU contractor in Riverside, CA. Detached ADU construction. 5+ years experience.

View Profile📞 (323) 599 9938
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#4BOWERS GREGORY JAMES

Riverside, CA

Bowers Gregory James — licensed ADU contractor in Riverside, CA. Detached ADU construction. 23+ years experience.

View Profile📞 (951) 240 0372
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#5PRESTIGE CONSTRUCTION AND RENOVATION SERVICES INC

Riverside, CA

Prestige Construction And Renovation Services Inc — licensed ADU contractor in Riverside, CA. Detached ADU construction. 12+ years experience.

View Profile📞 (951) 687 0007
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#6P T M GENERAL ENGINEERING SERVICES INC

Riverside, CA

P T M General Engineering Services Inc — licensed ADU contractor in Riverside, CA. Detached ADU construction. 19+ years experience.

View Profile📞 (951) 710 1000
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#7CALIFORNIA SHOWCASE CONSTRUCTION INC

Riverside, CA

California Showcase Construction Inc — licensed ADU contractor in Riverside, CA. Detached ADU construction. 17+ years experience.

View Profile📞 (951) 682 0208
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#8E A CONSTRUCTION

Riverside, CA

E A Construction — licensed ADU contractor in Riverside, CA. Detached ADU construction. 16+ years experience.

View Profile📞 (951) 637 7544
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#9A I E GENERAL CONSTRUCTION

Riverside, CA

A I E General Construction — licensed ADU contractor in Riverside, CA. Detached ADU construction. 9+ years experience.

View Profile📞 (805) 310 6465
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#10S A F A SERVICES INC

Riverside, CA

S A F A Services Inc — licensed ADU contractor in Riverside, CA. Detached ADU construction. 21+ years experience.

View Profile📞 (951) 961 2720
View All 925 Contractors →

💰 How Much Does an ADU Cost in Riverside?

Garage Conversion

$50,000 - $140,000

Converting existing garage to living space

Detached ADU

$100,000 - $280,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$3,000 - $9,000

Plan check, permits, utility connections

* Costs vary based on size, finishes, site conditions, and contractor. Get quotes from multiple Riverside contractors to compare pricing.

❓ Frequently Asked Questions About ADUs in Riverside

How much does it cost to build an ADU in Riverside?▼
The average cost to build an ADU in Riverside ranges from $100,000 to $280,000, or approximately $200 to $400 per square foot. Garage conversions typically cost $50,000 to $140,000.
How long does it take to get an ADU permit in Riverside?▼
The ADU permit process in Riverside typically takes 4 to 10 weeks. California law requires cities to approve or deny ADU permits within 60 days of receiving a complete application.
What are the ADU size limits in Riverside?▼
In Riverside, detached ADUs can be up to 1200 square feet. Attached ADUs are limited to 50% of the primary dwelling or 1,200 sqft, whichever is less. Junior ADUs (JADUs) are limited to 500 sqft and must be within the existing home.
What is the setback requirement for ADUs in Riverside?▼
Riverside requires 4-foot setbacks from side property lines and 4-foot setbacks from rear property lines for new ADU construction. Converted structures (like existing garages) may maintain their current setbacks.
Do I need to provide parking for my ADU in Riverside?▼
No parking is required for ADUs in Riverside if your property is within half a mile of public transit, in a historic district, part of an existing multi-family building, or if the ADU is a garage conversion. Otherwise, one space may be required.

Also See ADU Contractors In

Los Angeles (3215)San Diego (2582)San Francisco (2170)Sacramento (1551)Fresno (904)Anaheim (784)Irvine (760)Huntington Beach (667)

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