ADUByCity
Verified March 14, 2026

ADU Regulations in Pomona, California

Los Angeles County · CA · Pop. 155,000

Max ADU Size

1,200

sq ft detached

Rear Setback

4 ft

Permit Timeline

60 days for ministerial review

Build Cost

$140,000 – $290,000

Zoning

Allowed ADU Types

✓Detached ADU
✓Attached ADU
✓JADU (Junior ADU)
✓Garage Conversion
Max per lot: 2 ADUs✓ No owner-occupancy required

Pomona is located at the eastern end of the San Gabriel Valley, anchored by Cal Poly Pomona, Western University of Health Sciences, and DeVry University. This institutional base creates consistent demand from students, faculty, and medical residents — making ADUs a reliable rental investment despite the city's lower-cost market.

Source: City of Pomona — Accessory Dwelling Units · Pomona Municipal Code Article IX (Zoning), Section 9-23

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 are generally exempt from lot coverage limits under state law

Pomona has a wide range of lot sizes, from compact 5,000 sq ft urban lots near downtown to larger parcels in residential-agricultural zones on the city's edges. Garage conversions are common given the prevalence of older single-family homes with detached garages.

Permitting

Permit Process

Department

Planning Division — Department of Planning and Economic Development

Review Timeline

60 days for ministerial review

Permit Fees

$6,000 – $12,000

Impact Fees

Impact fees waived for ADUs under 750 sq ft per state law; school fees may apply above that threshold

Required Documents

  • ›Site plan (to scale, showing all structures, setbacks, and lot dimensions)
  • ›Architectural floor plans
  • ›Elevation drawings
  • ›Title 24 energy compliance report
  • ›Structural drawings (new construction)
  • ›Soils report (if new footings required)

Pomona's Planning Division has aligned its ADU process with state law timelines. The department offers pre-application consultations to help homeowners understand site-specific requirements. Lower land costs in Pomona relative to west San Gabriel Valley cities translate to higher ADU ROI potential.

Visit Planning Division — Department of Planning and Economic Development →

Infrastructure

Utilities & Requirements

Solar

Required

Parking

Not required

Separate Meter

Optional

Fire Sprinklers

See note

Sewer: Los Angeles County Sanitation Districts manage regional sewer; connection to existing lateral required
Fire Sprinklers: Not required unless primary dwelling has fire sprinklers
Parking: No additional parking required

Southern California Edison provides electricity; SoCalGas serves natural gas. Pomona's Inland Valley location provides strong solar production. Electrical panel upgrades are commonly required for new ADUs in neighborhoods built before 1980. Water service provided by Pomona Water Department for most of the city.

Financials

ADU Costs in Pomona

Typical Build Cost

$140,000 – $290,000

Cost per Sq Ft

$200 – $265

Monthly Rental

$1,400 – $2,200/mo/mo

Property Value Added

Adds $120,000 – $230,000 to property value

Available Grants & Programs

  • ★CalHFA ADU Grant Program (up to $40,000 for eligible low-income owners)
  • ★LA County Community Development Commission programs may apply
  • ★City of Pomona's housing programs may offer additional assistance

Cal Poly Pomona's enrollment of ~27,000 students and Western University's medical programs create a captive rental market. ADUs near the campuses (within 1–2 miles) command a premium. Garage conversions are the most affordable option at $55,000–$105,000, and the city's older housing stock makes this type of conversion widely feasible.

Use the free ADU Cost Calculator →

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Disclaimer: Information is compiled from publicly available municipal codes for general informational purposes only. It does not constitute legal, zoning, or construction advice. Regulations change frequently. Always verify with your local planning department. Last verified: March 14, 2026. Verify with Planning Division — Department of Planning and Economic Development

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Max 1,200 sq ft · $150,000 – $420,000

Santa Clarita

Max 1,200 sq ft · $150,000 – $320,000

Glendale

Max 1,200 sq ft · $160,000 – $370,000

Palmdale

Max 1,200 sq ft · $130,000 – $270,000

Lancaster

Max 1,200 sq ft · $120,000 – $250,000

Pomona Quick Facts

  • Max size1,200 sq ft
  • Rear setback4 ft
  • Permit timeline60 days for ministerial review
  • Build cost$140,000 – $290,000
  • Rental income$1,400 – $2,200/mo/mo
  • Owner occupancyNot required

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Official Source

City of Pomona — Accessory Dwelling Units

Pomona Municipal Code Article IX (Zoning), Section 9-23

Last verified: March 14, 2026

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