Accessory Structures in Rancho Cucamonga, CA (2026)
6 verified accessory structures rules for Rancho Cucamonga, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Rancho Cucamonga regulates accessory dwelling units under Development Code Chapter 17.100. Detached ADUs are capped at 1,200 square feet and 16 feet in height (18 feet near transit), attached units at 1,200 square feet or half the main house, and every ADU must clear a four-foot side and rear setback under § 17.100.060.
Rancho Cucamonga ADU Size and Setback Rules
Some RestrictionsRancho Cucamonga, CA, Development Code § 17.100.060(F),(H); Table 17.100.050-1
F. Size and Height. The size and height of the ADU shall comply with the requirements indicated in Table 17.100.050-1 as follows: Accessory Dwelling Unit Type / Minimum Size / Maximum Size / Height: Attached 220 sq. ft.; 50% of main dwelling unit or 1,200 sq. ft., whichever is less; 25 feet. Detached 350 sq. ft.; 1,200 sq. ft.; 16 feet or 18 feet. ... H. Setbacks. ADUs shall comply with the fol...
ADU Impact Fees
Rancho Cucamonga waives its storm drainage impact fee for accessory dwelling units under 650 square feet under Municipal Code section 13.08.060(C). Larger ADUs pay a fee based only on the net square footage exceeding what an existing single-family home already covers.
Rancho Cucamonga ADU Storm Drainage Fee Rules
Some RestrictionsRancho Cucamonga, CA, Municipal Code §§ 13.08.040(F), 13.08.060(C)
Drainage fees shall not be required as a condition of the issuance of a building permit for: ... C. For single-family residences, an addition, guesthouse, or accessory dwelling unit that does not exceed 650 square feet in area... If the parcel with respect to which the building permit is issued is an existing single family residence that is required to pay drainage fee pursuant to this chapter ...
ADU Owner Occupancy
Rancho Cucamonga requires the property owner to live in either the main house or the junior ADU whenever a JADU is built. Development Code § 17.100.090(C) waives that owner-occupancy rule only when the owner is a governmental agency, land trust, or housing organization; full ADUs carry no such requirement.
Rancho Cucamonga JADU Owner-Occupancy Rule
Some RestrictionsRancho Cucamonga, CA, Development Code § 17.100.090(C)
C. Owner Occupancy for JADUs. The owner must reside in either the remaining portion of the primary dwelling or in the newly created JADU. Owner occupancy shall not be required when the owner is another governmental agency, land trust, or housing organization.
ADU Rental Restrictions
Rancho Cucamonga bars short-term rentals of accessory dwelling units. Development Code § 17.100.090(B) requires any rental of an ADU or JADU to run more than 30 consecutive days, ruling out nightly or weekly listings on platforms like Airbnb or Vrbo for these units citywide.
Rancho Cucamonga ADU 30-Day Rental Minimum
Significant RestrictionsRancho Cucamonga, CA, Development Code § 17.100.090(B)
B. Rental Terms. Any rental of an ADU or JADU shall be for a period exceeding 30 consecutive days.
Shed & Carport Rules
Detached solid-roof structures like garages and sheds under 120 square feet and six feet tall are exempt from planning review, but larger sheds must meet Table 17.42.040-1's five-foot side and rear setbacks, a 16-foot height cap, and a 30 percent rear-yard coverage limit under Development Code Section 17.42.040.
Rancho Cucamonga Shed Size and Setback Rules
Some RestrictionsRancho Cucamonga, CA, Development Code § 17.42.040, Table 17.42.040-1
Building coverage. Accessory structures shall not occupy more than 30 percent of the rear yard setback area. Solid roof accessory structures are further subject to the lot coverage requirements of the zone in which it is located. ... TABLE 17.42.040-1 DEVELOPMENT STANDARDS FOR ACCESSORY STRUCTURES ... Detached Solid Roof Structures (i.e., garages, sheds) ... Not permitted [front] ... 5 ft [rear...
Garage Conversions
Converting a garage into an ADU or JADU in Rancho Cucamonga does not trigger a requirement to replace the lost parking, and a JADU built inside an attached garage counts as part of the main house rather than a separate accessory structure, under Development Code §§ 17.100.060(I)(4) and 17.100.070(B).
Rancho Cucamonga Garage Conversion for ADUs
Some RestrictionsRancho Cucamonga, CA, Development Code § 17.100.060(I)(4); § 17.100.070(B)
4. When a required garage, carport, or covered parking structure for the main dwelling is converted or demolished in conjunction with the construction of an ADU, replacement of parking spaces that are eliminated by the construction of the ADU shall not be required as long as the ADU remains in use as a legal ADU. ... B. A JADU shall be contained entirely within the walls of the existing or prop...
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