ADUByCity
Verified March 14, 2026

ADU Regulations in Hesperia, California

San Bernardino County · CA · Pop. 95,000

Max ADU Size

1,200

sq ft detached

Rear Setback

4 ft

Permit Timeline

60 days

Build Cost

$115,000 – $235,000

Zoning

Allowed ADU Types

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

Hesperia is located in the High Desert and has large lot sizes common to the Victor Valley area. ADU regulations comply with California state law. Rural residential lots may have additional utility considerations.

Source: City of Hesperia — Accessory Dwelling Units · Hesperia Development Code Title 16, Chapter 16.38

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 35% for RL zones

Larger lot sizes in Hesperia often provide ample room for detached ADUs well within setback requirements. Septic-served lots require additional engineering review.

Permitting

Permit Process

Department

City of Hesperia Community Development Department — Planning Division

Review Timeline

60 days

Permit Fees

$4,000 – $8,500

Impact Fees

Impact fees waived for ADUs under 750 sq ft; reduced 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
  • ›Septic system assessment (if applicable)

Hesperia has among the more affordable permitting fee structures in Southern California, reflecting the city's goal of expanding housing stock. Septic-served properties require county environmental health sign-off, which may extend overall project timelines.

Visit City of Hesperia Community Development Department — Planning Division →

Infrastructure

Utilities & Requirements

Solar

Required

Parking

Not required

Separate Meter

Optional

Fire Sprinklers

See note

Sewer: City sewer available in most developed areas; some rural parcels remain on septic — verify with Hesperia Water District
Fire Sprinklers: Not required unless the primary structure requires them
Parking: No additional parking required

Financials

ADU Costs in Hesperia

Typical Build Cost

$115,000 – $235,000

Cost per Sq Ft

$165 – $220

Monthly Rental

$1,100 – $1,700/mo/mo

Property Value Added

Adds $110,000 – $230,000 to property value

Available Grants & Programs

  • ★CalHFA ADU Grant Program available (up to $40,000 for pre-development costs)

Hesperia offers some of the lowest ADU construction costs in Southern California due to lower land and labor costs in the High Desert. Proximity to the Victorville logistics corridor supports stable working-family rental demand. Rental rates are lower than coastal markets but yields can be strong relative to build costs.

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 City of Hesperia Community Development Department — Planning Division

Explore More

Nearby Cities in San Bernardino County

San Bernardino

Max 1,200 sq ft · $100,000 – $220,000

Fontana

Max 1,200 sq ft · $110,000 – $230,000

Ontario

Max 1,200 sq ft · $115,000 – $240,000

Rancho Cucamonga

Max 1,200 sq ft · $150,000 – $310,000

Victorville

Max 1,200 sq ft · $115,000 – $240,000

Rialto

Max 1,200 sq ft · $130,000 – $265,000

Hesperia Quick Facts

  • Max size1,200 sq ft
  • Rear setback4 ft
  • Permit timeline60 days
  • Build cost$115,000 – $235,000
  • Rental income$1,100 – $1,700/mo/mo
  • Owner occupancyNot required

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Official Source

City of Hesperia — Accessory Dwelling Units

Hesperia Development Code Title 16, Chapter 16.38

Last verified: March 14, 2026

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