Riverside, Riverside County

Room Addition Cost in Riverside, CA

Riverside remodeling costs are 15% belowthe California state average. Here's what a typical room addition costs in Riverside in 2026, based on a 300 sqf project.

Budget
$51,000
$170/sqf
Mid-Range
$89,250
$298/sqf
High-End
$140,250
$468/sqf

Cost breakdown

Foundation & Framing
30%$26,775
Roofing & Exterior
15%$13,388
Mechanical (HVAC, Electrical)
15%$13,388
Interior Finishes
20%$17,850
Windows & Doors
10%$8,925
Permits & Engineering
10%$8,925

Breakdown based on mid-range estimate of $89,250

Typical Timeline
3-6 months
Permits Required

Building permit, structural engineering, possibly zoning approval.

Remodeling in Riverside

The Inland Empire offers some of the lowest remodeling costs in Southern California - 15-20% below coastal cities. Heat-resistant materials and HVAC efficiency are important considerations.

A room addition adds square footage and value to your home. Costs depend on whether it's a simple bump-out, a second story, or a full wing addition with plumbing.

Have estimates for your Riverside project?

Upload them and get an AI-powered comparison with CSLB license verification. Free.

Compare Estimates →

Other projects in Riverside

Kitchen Remodel
$25,500 – $76,500
Bathroom Remodel
$12,750 – $40,800
ADU / Guest House
$106,250 – $255,000
Roof Replacement
$10,625 – $31,875
Exterior Paint
$4,250 – $14,875
Whole House Remodel
$229,500 – $765,000

Room Addition cost in other California cities

Hermosa Beach
$72,000 – $198,000 | Los Angeles County
Corona
$54,000 – $148,500 | Riverside County
Anaheim
$63,000 – $173,250 | Orange County
Redondo Beach
$66,000 – $181,500 | Los Angeles County
Arcadia
$66,000 – $181,500 | Los Angeles County
Castro Valley
$66,000 – $181,500 | Alameda County
Woodland Hills
$63,000 – $173,250 | Los Angeles County
Santa Monica
$72,000 – $198,000 | Los Angeles County

Get a personalized estimate

Use our interactive cost estimator to adjust square footage and see detailed pricing for your specific project.

Open Cost Estimator →