ADU Regulations in Hayward, California
Alameda County · CA · Pop. 160,000
Max ADU Size
1,200
sq ft detached
Rear Setback
4 ft
Permit Timeline
60 days for ministerial review
Build Cost
$185,000 – $380,000
Zoning
Allowed ADU Types
Hayward is a major East Bay hub with direct BART access (South Hayward and Hayward stations), California State University East Bay, and proximity to the 880 and 92 Freeways. This makes ADUs highly rentable to students, BART commuters, and tech workers priced out of San Jose or San Francisco.
Source: City of Hayward — Accessory Dwelling Units · Hayward Municipal Code Chapter 10 (Zoning), Section 10-1.3301
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 if attached
Lot coverage: Per underlying zone; ADUs exempt from lot coverage restrictions under state law
Hayward has a mix of flat East Bay lots and hillside parcels; hillside properties may require geotechnical review and may face additional grading requirements. Conversions of existing structures retain existing setbacks.
Permitting
Permit Process
Department
Planning Division
Review Timeline
60 days for ministerial review; pre-approved standard plans may qualify for 30-day review
Permit Fees
$9,000 – $18,000
Impact Fees
Impact fees waived for ADUs under 750 sq ft; school and transportation fees may apply above that threshold
Required Documents
- ›Site plan (to scale, showing all structures, setbacks, and utilities)
- ›Architectural floor plans (existing and proposed)
- ›Elevation drawings (all sides)
- ›Title 24 energy compliance report
- ›Structural drawings (new construction)
- ›Geotechnical/soils report (hillside parcels)
Bay Area permitting costs reflect higher labor costs for city staff and third-party plan checkers. Hayward has adopted a pre-approved ADU standard plan program to speed review. Alameda County also has a regional ADU resource center that Hayward homeowners can access.
Visit Planning Division →Infrastructure
Utilities & Requirements
Solar
Required
Parking
Not required
Separate Meter
Optional
Fire Sprinklers
See note
PG&E serves electricity and gas. BART proximity (within 0.5 miles of Hayward or South Hayward stations) makes parking truly unnecessary for many ADU tenants. Electrical panel upgrades are frequently needed in Hayward's older single-family housing stock.
Financials
ADU Costs in Hayward
Typical Build Cost
$185,000 – $380,000
Cost per Sq Ft
$260 – $340
Monthly Rental
$1,900 – $3,000/mo/mo
Property Value Added
Adds $200,000 – $360,000 to property value
Available Grants & Programs
- ★CalHFA ADU Grant Program (up to $40,000 for eligible low-income owners)
- ★Alameda County ADU Pilot Loan Program
- ★EBMUD water connection fee waivers for ADUs in some programs
Hayward represents one of the most accessible entry points into East Bay ADU investment. Build costs are lower than Oakland or Berkeley, but rental rates are competitive due to BART access and CSUEB enrollment. Garage conversions at $80,000–$150,000 are popular given the city's older housing stock.
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Hayward Quick Facts
- Max size1,200 sq ft
- Rear setback4 ft
- Permit timeline60 days for ministerial review
- Build cost$185,000 – $380,000
- Rental income$1,900 – $3,000/mo/mo
- Owner occupancyNot required
Official Source
City of Hayward — Accessory Dwelling UnitsHayward Municipal Code Chapter 10 (Zoning), Section 10-1.3301
Last verified: March 14, 2026
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