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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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#1GRIFFITH CO

Riverside, CA

Griffith CO — licensed ADU contractor in Riverside, CA. Detached ADU construction. 17+ years experience.

View Profile📞 (951) 684 4800
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#2CANYON CONSTRUCTION SERVICES

Riverside, CA

Canyon Construction Services — licensed ADU contractor in Riverside, CA. Detached ADU construction. 12+ years experience.

View Profile📞 (800) 294 8485
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#3LEOS FRAMING

Riverside, CA

Leos Framing — licensed ADU contractor in Riverside, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (714) 356 1387
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#4R A W SERVICES INC

Riverside, CA

R A W Services Inc — licensed ADU contractor in Riverside, CA. Detached ADU construction. 14+ years experience.

View Profile📞 (909) 721 6617
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#5TAVAGLIONE CONSTRUCTION & DEVELOPMENT INC

Riverside, CA

Tavaglione Construction & Development Inc — licensed ADU contractor in Riverside, CA. Detached ADU construction. 53+ years experience.

View Profile📞 (951) 684 8870
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#6BOGDAN CONSTRUCTION

Riverside, CA

Bogdan Construction — licensed ADU contractor in Riverside, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (951) 403 7939
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#7RIVERSIDE DEVELOPMENT GROUP

Riverside, CA

Riverside Development Group — licensed ADU contractor in Riverside, CA. Detached ADU construction. 22+ years experience.

View Profile📞 (951) 334 9657
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#8GLENFORD CONSTRUCTION

Riverside, CA

Glenford Construction — licensed ADU contractor in Riverside, CA. Detached ADU construction. 15+ years experience.

View Profile📞 (951) 334 0572
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#9GOLDEN STATE CONSTRUCTION

Riverside, CA

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

View Profile📞 (909) 801 1517
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#10PAS PROPERTY MANAGEMENT INC

Riverside, CA

Pas Property Management Inc — licensed ADU contractor in Riverside, CA. Detached ADU construction. 10+ years experience.

View Profile📞 (951) 833 3662
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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