ADU Regulations in Garden Grove, California
Orange County · CA · Pop. 175,000
Max ADU Size
1,200
sq ft detached
Rear Setback
4 ft
Permit Timeline
60 days for ministerial review
Build Cost
$160,000 – $330,000
Zoning
Allowed ADU Types
Garden Grove is a dense suburban city in north Orange County. Garage conversions are especially prevalent given the city's older single-family housing stock with attached and detached garages. ADUs are permitted by right in all residential zones.
Source: City of Garden Grove — Accessory Dwelling Units · Garden Grove Municipal Code Title 9 (Zoning), Chapter 9.04
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 if attached
Lot coverage: Per underlying zone; state law exempts ADUs from lot coverage limits in many cases
Many Garden Grove lots are compact (5,000–7,000 sq ft), so ADU placement requires careful site planning to meet setbacks. Garage conversions on existing footprints can avoid setback issues entirely.
Permitting
Permit Process
Department
Community Development Department
Review Timeline
60 days for ministerial review
Permit Fees
$8,000 – $17,000
Impact Fees
Impact fees waived for ADUs under 750 sq ft; applicable fees assessed proportionally above that size
Required Documents
- ›Site plan (to scale)
- ›Floor plans (existing and proposed)
- ›Elevation drawings
- ›Title 24 energy compliance report
- ›Structural drawings (new construction)
- ›Soils/geotechnical report (if required by building official)
Orange County permitting costs are generally higher than Inland Empire but lower than coastal cities. Garden Grove's Community Development department provides an ADU handout with local checklist. Pre-application meetings are encouraged for new detached construction.
Visit Community Development Department →Infrastructure
Utilities & Requirements
Solar
Required
Parking
Not required
Separate Meter
Optional
Fire Sprinklers
See note
Golden State Water Company and Garden Grove serve different parts of the city for water. Verify your utility provider. Electrical panel upgrades are common when converting garages, particularly in homes built prior to 1990.
Financials
ADU Costs in Garden Grove
Typical Build Cost
$160,000 – $330,000
Cost per Sq Ft
$225 – $300
Monthly Rental
$1,700 – $2,700/mo/mo
Property Value Added
Adds $160,000 – $290,000 to property value
Available Grants & Programs
- ★CalHFA ADU Grant Program (up to $40,000 for eligible low-income owners)
- ★Orange County Housing Finance Trust programs may be available
Garden Grove's location near Disneyland, the 22 Freeway, and Little Saigon supports consistent rental demand. Garage conversions typically run $70,000–$130,000 and represent the most cost-effective ADU option for the city's older housing stock.
Use the free ADU Cost Calculator →Free Service
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Garden Grove Quick Facts
- Max size1,200 sq ft
- Rear setback4 ft
- Permit timeline60 days for ministerial review
- Build cost$160,000 – $330,000
- Rental income$1,700 – $2,700/mo/mo
- Owner occupancyNot required
Official Source
City of Garden Grove — Accessory Dwelling UnitsGarden Grove Municipal Code Title 9 (Zoning), Chapter 9.04
Last verified: March 14, 2026
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