ADU Regulations in Whittier, California
Los Angeles County · CA · Pop. 87,000
Max ADU Size
1,200
sq ft detached
Rear Setback
4 ft
Permit Timeline
60 days
Build Cost
$155,000 – $315,000
Zoning
Allowed ADU Types
Whittier is a historic Southeast Los Angeles County city known for its charming Uptown district and Whittier College. Family-oriented neighborhoods with mature trees and craftsman architecture define much of the residential fabric. ADU regulations comply with California state law, and the city has streamlined its review process.
Source: City of Whittier — Accessory Dwelling Units · Whittier Municipal Code Title 10 (Zoning), Chapter 10.108
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 per underlying zone
side
4 ft
rear
4 ft
Max height: 16 ft
Lot coverage: Per underlying zone; typically 40–50% in R-1 zones
Whittier's older residential neighborhoods typically feature 6,000–9,000 sq ft lots with detached garages, which are prime candidates for garage conversion ADUs. Historic Uptown Whittier area properties should consult the Planning Division for any design guidelines applicable to their block.
Permitting
Permit Process
Department
City of Whittier Community Development Department — Planning Division
Review Timeline
60 days
Permit Fees
$7,500 – $15,000
Impact Fees
Impact fees waived for ADUs under 750 sq ft; proportional fees apply above that threshold
Required Documents
- ›Site plan (to scale, showing lot dimensions, all structures, setbacks)
- ›Floor plans
- ›Elevations
- ›Title 24 energy compliance (residential)
- ›Structural drawings
Whittier's planning counter processes ADU applications with a focus on ministerial review compliance. The city's over-the-counter pre-application consultation is a useful first step. LA County Sanitation Districts serve Whittier for sewer service.
Visit City of Whittier Community Development Department — Planning Division →Infrastructure
Utilities & Requirements
Solar
Required
Parking
Not required
Separate Meter
Optional
Fire Sprinklers
See note
Financials
ADU Costs in Whittier
Typical Build Cost
$155,000 – $315,000
Cost per Sq Ft
$215 – $280
Monthly Rental
$1,600 – $2,500/mo/mo
Property Value Added
Adds $175,000 – $320,000 to property value
Available Grants & Programs
- ★CalHFA ADU Grant Program available (up to $40,000 for pre-development costs)
- ★LA County ADU Finance Program — check with LA County Community Development
Whittier offers stable, long-term rental demand anchored by Whittier College students and staff, Rio Hondo College proximity, and family-oriented residents priced out of closer-in LA neighborhoods. Construction costs are slightly lower than West LA, and the city's historic character supports long-term property value appreciation. Uptown Whittier's dining and retail revival is attracting younger renters to the area.
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Whittier Quick Facts
- Max size1,200 sq ft
- Rear setback4 ft
- Permit timeline60 days
- Build cost$155,000 – $315,000
- Rental income$1,600 – $2,500/mo/mo
- Owner occupancyNot required
Official Source
City of Whittier — Accessory Dwelling UnitsWhittier Municipal Code Title 10 (Zoning), Chapter 10.108
Last verified: March 14, 2026
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ADU rules change often.
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