Accessory Structures in Lancaster, CA

If you live in Lancaster or are thinking about moving there, accessory structures are one of those things you probably won't think about until they affect you directly. Lancaster has 5 specific rules on the books covering different aspects of accessory structures, and some of them might surprise you.

ADU Rules

Lancaster caps attached and detached ADUs at 850 square feet for a studio or one-bedroom unit and 1,200 square feet for two or more bedrooms, with a 25-foot front setback, 4-foot side and rear setbacks, and a height limit of 18 to 25 feet depending on ADU type.

Key details: Max ADUs per lot: One ADU + one JADU (single-family). Size cap: 850 sq ft (studio/1BR), 1,200 sq ft (2+BR). Attached ADU height: 25 feet, max 2 stories. Detached ADU height: 18 feet, up to 20 for roof pitch. Front setback: 25 feet.

Constructing an ADU that exceeds the size, height, setback or lot-coverage limits of Sec. 17.41.016 without an approved permit is a zoning code violation; under citywide Sec. 1.12.020, a misdemeanor conviction carries up to a $1,000 fine, up to six months in county jail, or both, with each day of noncompliance a separate offense, while an infraction citation runs $100 to $500 depending on repeat count within a year.

Shed & Carport Rules

A backyard shed of 120 square feet or less can sit right on the interior or rear property line in Lancaster and rise up to 8 feet, while a bigger shed or gazebo needs a 5-foot setback and tops out at one story or 12 feet. Both must stay 6 feet from the main house, per Municipal Code Section 17.08.160.

Key details: Small shed (≤120 sq ft): 8 ft height, 0 ft side/rear setback. Larger shed/gazebo (>120 sq ft): 12 ft height, 5 ft side/rear setback. Distance from main dwelling: 6 feet minimum, both tiers. Rear yard roof coverage cap: 50% (60% on infill lots <7,000 sq ft). Governing section: LMC § 17.08.160.

Lancaster enforces accessory structure standards as part of its zoning code. Municipal Code Section 17.04.220 makes any violation of Title 17, including an entitlement, permit or exception granted under it, a violation of the code punishable as set out in Chapter 1.12. A shed built over the height, setback or rear-yard coverage limits in Section 17.08.160 is subject to code enforcement action and may have to be relocated, resized or removed at the owner's expense.

ADU Owner Occupancy

Lancaster requires at least one person holding legal or equitable title to reside on the property as their permanent residence once an ADU or JADU is built, though ADUs permitted between January 1, 2020 and January 1, 2025 are exempt unless the lot has both an ADU and a JADU.

Key details: Requirement: One title-holder must reside on-site. Exemption window: ADUs permitted 1/1/2020-1/1/2025. Exemption ends if: Property has both an ADU and JADU. Enforcement tool: Recorded deed restriction. Recorded with: LA County Recorder.

Occupying a Lancaster ADU/JADU property in violation of the recorded deed restriction's owner-occupancy terms lets the director pursue legal action, an injunction against continued unlawful use, or abatement of the unit under Sec. 17.41.018.F.5; general misdemeanor penalties under Sec. 1.12.020 (up to $1,000 fine or six months in jail) can also apply to code violations.

ADU Rental Restrictions

Lancaster bars renting any ADU or JADU for less than 30 days, a ban that applies no matter when the unit was created, and separately forbids selling or conveying an ADU or JADU apart from the main lot and primary dwelling.

Key details: Minimum rental term: 30 days. Applies to: All ADUs and JADUs, any creation date. Separate-sale ban: Cannot convey apart from primary lot. Exception: Gov't Code Sec. 65852.26 transfers. Enforcement: Recorded deed restriction, city legal action.

Renting a Lancaster ADU or JADU for fewer than 30 days, or selling it apart from the primary dwelling and lot, breaches the recorded deed restriction and lets the director pursue legal action, injunctive relief, or unit abatement under Sec. 17.41.018.F.5; the city's general misdemeanor penalty under Sec. 1.12.020 (up to $1,000 fine or six months in jail) can also apply.

Garage Conversions

Converting an attached garage into living space in Lancaster requires replacing the lost garage with 2 new off-street parking spaces on-site, keeping interior access to the house, and removing any street-facing garage door, under Municipal Code Section 17.08.220(B). The owner must also waive city liability in writing for any applicable deed restrictions and complete the work under permits and inspections.

Key details: Replacement parking: 2 off-street spaces required. Street door: No door access facing the street. House access: Interior access to house must remain. Unpermitted conversions: 30 days to request inspection once notified. ADU track: Separate rules apply for ADU conversions.

A garage converted without permits is deemed an illegal garage conversion under Section 17.08.220(C). Once notified, the owner has 30 days to request a building and safety division inspection and pay required fees; failure to either correct cited deficiencies and add the 2 replacement parking spaces, or remove the conversion and restore the garage, leaves the owner subject to the citywide Section 1.12.020 penalty schedule of infraction or misdemeanor fines up to $1,000 and six months in jail.

The Bottom Line

Lancaster's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Lancaster is broadly strict or permissive.

These rules come from Lancaster's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.