Accessory Structures in El Cajon, CA (2026)
6 verified accessory structures rules for El Cajon, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
El Cajon allows one accessory dwelling unit and one junior ADU on every eligible single-family lot as a matter of right under Municipal Code § 17.140.180, capped at 1,200 square feet of habitable space and never larger than the primary home including its garage. A building permit is required, but review is ministerial.
El Cajon Accessory Dwelling Unit Standards
Some RestrictionsEl Cajon Municipal Code § 17.140.180
§ 17.140.180. Accessory and junior accessory dwelling units. A. Permit Required. A building permit is required for any new accessory or junior accessory dwelling unit. B. Number of ADUs. The number and types of accessory dwelling units allowed shall include all ADU combinations described in Government Code section 66323. 1. Lots with Single-Family Dwelling Units. For each eligible single-family...
ADU Impact Fees
El Cajon waives development impact fees entirely for any accessory or junior accessory dwelling unit under 750 square feet under § 17.140.180(G)(2); units larger than 750 square feet are charged impact fees only proportionately, based on the ADU's square footage relative to the primary dwelling.
El Cajon ADU Development Impact Fee Waiver
Light RestrictionsEl Cajon Municipal Code § 17.140.180(G)(1)-(2)
Development Impact Fees; Applicability. Development Impact Fees for ADUs and JADUs shall comply with Chapter 17.25 Procedures, Hearings, Notices and Fees. Fee Waiver. In addition to the requirements in Chapter 17.25, ADUs or JADUs that are less than 750 square feet shall not be subject to any impact fees. Any impact fees charged for an ADU more than 750 square feet shall be charged proportionat...
ADU Owner Occupancy
El Cajon does not impose an owner-occupancy requirement on standard accessory dwelling units, but § 17.140.180(F)(1) requires the property owner to live in either the primary home or the junior accessory dwelling unit whenever the two share common sanitation facilities, unless the owner is a government agency, land trust, or housing organization.
El Cajon JADU Owner-Occupancy Requirement
Some RestrictionsEl Cajon Municipal Code § 17.140.180(F)(1)
Owner Occupancy. The property owner must occupy either the primary dwelling unit or the junior accessory dwelling unit if there are common sanitation facilities, unless the property owner is a governmental agency, land trust, or housing organization. Should this requirement not be honored by the property owner, it will be cause to have the junior accessory dwelling unit removed in accordance wi...
Shed & Carport Rules
El Cajon exempts one-story detached tool and storage sheds up to 120 square feet from a building permit, but only on property with a single-family (R-3) home, set at least six feet from any other building. The exemption never waives the zoning code's setback and lot coverage rules.
El Cajon Backyard Shed Permit Exemption
Some RestrictionsEl Cajon Municipal Code § 15.04.040(A), (C)
One-story detached accessory structures used as tool and storage sheds, playhouses and similar uses, provided the floor area does not exceed 120 square feet (11.2m2) and when erected as accessory to an R-3 occupancy on the same property. The structure shall be at least six feet from any other building on the property, maintain setbacks from property lines as outlined in the zoning code, and not...
Garage Conversions
Converting an El Cajon garage into living space is treated as an accessory dwelling unit conversion under Municipal Code § 17.140.180(E)(1): the converted structure must meet building and fire safety codes, keep independent exterior access from the primary home, and carry sufficient side and rear setbacks for fire safety. Section 17.140.170(F)(7) separately bars any converted garage entryway from facing the street.
El Cajon Garage Conversion to Living Space Rules
Some RestrictionsEl Cajon Municipal Code §§ 17.140.180(E)(1), 17.140.170(F)(7)
Existing permitted structures converted to an accessory dwelling unit either attached or detached to the primary dwelling unit such as a garage or other accessory building shall meet the following requirements: a. Building and fire safety codes; b. Independent exterior access from the existing primary dwelling unit; and c. Sufficient side and rear setbacks for fire safety. ... Garage conversion...
Tiny Homes
El Cajon allows a movable tiny home only as an accessory dwelling unit behind the main house, capped at 150 to 430 square feet, and only after the owner obtains an Administrative Zoning Permit under Municipal Code Section 17.140.230.
El Cajon Movable Tiny Home Rules
Significant RestrictionsEl Cajon, CA, Municipal Code § 17.140.230 (Movable tiny homes)
A movable tiny home (MTH) is a transportable dwelling unit that is constructed to comply with standards applicable to recreational vehicles. They shall be licensed and registered with the California Department of Motor Vehicles. An MTH shall comply with the following general requirements: A. Shall be approved by an Administrative Zoning Permit when in compliance with all general requirements; B...
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