ADU Regulations in Corona, California
Riverside County · CA · Pop. 170,000
Max ADU Size
1,200
sq ft detached
Rear Setback
4 ft
Permit Timeline
60 days for ministerial review
Build Cost
$145,000 – $300,000
Zoning
Allowed ADU Types
Corona sits at the western edge of Riverside County, adjacent to Orange County via the 91 Freeway. It functions as a bedroom community for Orange County workers priced out of OC housing, creating strong commuter-oriented rental demand. ADUs are permitted by right in all residential zones.
Source: City of Corona — Accessory Dwelling Units · Corona Municipal Code Title 17 (Zoning), Chapter 17.56
Dimensions
Size & Setback Requirements
Detached
1,200
sq ft max
JADU
500
sq ft max
Attached
50% of primary home, max 1,200 sq ft
Setbacks
front
Same as primary dwelling
side
4 ft
rear
4 ft
Max height: 16 ft (detached); match primary structure height if attached
Lot coverage: Per underlying zone; ADUs generally exempt from lot coverage limits under state law
Corona's hillside and gated-community neighborhoods may have HOA restrictions; however, California law limits HOAs from banning ADUs outright. Verify CC&Rs and consult with the Planning Division for properties in planned developments.
Permitting
Permit Process
Department
Planning & Development Department
Review Timeline
60 days for ministerial review
Permit Fees
$6,000 – $13,000
Impact Fees
Impact fees waived for ADUs under 750 sq ft; fees assessed proportionally above that size
Required Documents
- ›Site plan (showing all structures, setbacks, and lot dimensions)
- ›Floor plans (existing and proposed)
- ›Elevation drawings
- ›Title 24 energy compliance report
- ›Structural calculations and drawings (new construction)
- ›Grading/drainage plan (if site grading is proposed)
Corona's Planning & Development department has streamlined ADU review to meet state-mandated timelines. The city's permit portal supports digital submission. Pre-application meetings are recommended for ADUs in planned unit developments or near open space preserves.
Visit Planning & Development Department →Infrastructure
Utilities & Requirements
Solar
Required
Parking
Not required
Separate Meter
Optional
Fire Sprinklers
See note
Southern California Edison provides electricity. Corona's proximity to the 91 and 15 Freeways makes it a transit-accessible Inland Empire market. Electrical panel upgrades are commonly required for new detached ADUs in neighborhoods with older electrical infrastructure.
Financials
ADU Costs in Corona
Typical Build Cost
$145,000 – $300,000
Cost per Sq Ft
$205 – $275
Monthly Rental
$1,500 – $2,400/mo/mo
Property Value Added
Adds $130,000 – $250,000 to property value
Available Grants & Programs
- ★CalHFA ADU Grant Program (up to $40,000 for eligible low-income owners)
- ★Riverside County housing programs may be available
Corona's OC bedroom-community status keeps ADU rental demand strong. Renters commuting to Irvine, Anaheim, or Newport Beach via the 91 Freeway or Metrolink regularly seek rentals in Corona at IE pricing. Garage conversions run $60,000–$120,000.
Use the free ADU Cost Calculator →Free Service
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Corona Quick Facts
- Max size1,200 sq ft
- Rear setback4 ft
- Permit timeline60 days for ministerial review
- Build cost$145,000 – $300,000
- Rental income$1,500 – $2,400/mo/mo
- Owner occupancyNot required
Official Source
City of Corona — Accessory Dwelling UnitsCorona Municipal Code Title 17 (Zoning), Chapter 17.56
Last verified: March 14, 2026
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ADU rules change often.
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