Compton's Accessory Structures: The Rules That Matter

Every city handles accessory structures a little differently. In Compton, California, there are 6 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Garage Conversions

Convert your garage to living space in Compton and the code locks a condition onto any future addition to that house. Section 30-21.2.d.2(a) bars expanding a residence with a legally converted garage unless the owner restores the original garage or builds a replacement garage first.

Key details: Section: § 30-21.2.d.2(a). Condition: Restore or replace garage before expanding. Incentive: +200 sq ft addition credit for restoring. Applies to: Legally converted garages on residences. No-garage homes: Can add 10% or 100 sq ft without parking.

Requesting a building permit to expand a home with a converted garage triggers plan check against Section 30-21.2.d.2(a); Building and Safety will not issue the addition permit until the applicant restores the original garage or builds a replacement, since the section makes restoration or replacement a precondition to expansion rather than an optional upgrade.

ADU Owner Occupancy

Compton requires owner-occupancy only when a junior accessory dwelling unit is on the property: Section 30-11.2.d.3 requires the recorded covenant to state that 'either the JADU or Primary Dwelling shall be occupied by the owner of record.' Full-size detached or attached ADUs built without a JADU carry no such owner-occupancy covenant under this section.

Key details: Trigger: Property has a JADU. Requirement: Owner occupies JADU or primary dwelling. Recorded via: Declaration of restrictions before occupancy. Companion rules: No separate sale, no rentals under 30 days. JADU size: 150 to 500 square feet.

Occupying neither the JADU nor the primary dwelling as the recorded owner, after signing the Section 30-11.2.d covenant, breaches the declaration of restrictions filed against the property. That exposes the owner to code enforcement action and the Municipal Code's default penalty under Section 1-6.2, up to a $1,000 fine, up to six months in jail, or both, along with any civil remedy available to enforce the recorded covenant.

ADU Impact Fees

Compton exempts small accessory dwelling units from development impact fees entirely. Section 30-11.2.e.2.a states that 'ADUs that are less than 750 square feet shall not be subject to impact fees,' while units of 750 square feet or larger are charged fees scaled proportionally to the size of the primary dwelling rather than a flat citywide rate.

Key details: Full fee exemption: ADUs under 750 sq ft. Prorated fee: ADUs 750 sq ft or larger. Fee basis: Proportional to primary dwelling size. Utility connection fee: Allowed, sized to ADU burden. Governing state law: Gov. Code § 66000 et seq..

There is no separate penalty provision for impact fees; the requirement is enforced through the standard building permit process. An ADU cannot obtain its Certificate of Occupancy under Section 30-11.2.d until any impact fees actually owed under Section 30-11.2.e.2 have been paid to the city, and misrepresenting an ADU's square footage to claim the under-750-square-foot exemption would fall under the Municipal Code's general fraud and misdemeanor penalties in Section 1-6.2.

The rules around adu impact fees in Compton lean permissive, but that does not mean anything goes.

ADU Rules

Compton's ADU ordinance, Section 30-11.2, lets homeowners build one accessory dwelling unit plus one junior ADU by right on any lot zoned for single- or multi-family use, ministerially approved through a building permit rather than discretionary review. Detached ADUs top out at 850 to 1,200 square feet depending on the zone and bedroom count, capped at 16 feet in height with 4-foot side and rear setbacks.

Key details: Approval path: Ministerial building permit, no hearing. Detached ADU size: 850-1,000 sq ft (1,200 in R-A). Detached ADU height cap: 16 feet. Setback: 4 feet side and rear. Parking: 1 space per ADU, 5 listed waivers.

An ADU built without the required permit, or one that exceeds the size, height or setback standards of Section 30-11.2.j, is subject to the Municipal Code's standard enforcement path: correction through the Building and Safety Department or, absent voluntary compliance, the general penalty in Section 1-6.2 of up to $1,000, up to six months in jail, or both.

Shed & Carport Rules

A backyard tool or storage shed in Compton can skip a building permit only if it's a single story, no bigger than 120 square feet, and no taller than 12 feet. Anything larger needs a full building permit application through the Building and Safety Department, under Municipal Code § 15-4.2.

Key details: Permit-exempt shed size: ≤120 sq ft. Permit-exempt shed height: ≤12 ft. Structure type: One-story, detached only. Governing amendment: Ord. No. 2339 (2021). Exceeding threshold: Full building permit required.

Building a shed larger than 120 square feet or taller than 12 feet without first obtaining a building permit is treated as unpermitted construction, enforceable the same as any other Building Code violation. Section 105.2 makes clear the size-based exemption never authorizes work that otherwise violates the Building Code or the City's other ordinances, including zoning and setback requirements.

ADU Rental Restrictions

Compton bars accessory dwelling units from being used as short-term rentals. Before the city will issue a Certificate of Occupancy, Section 30-11.2.d requires the property owner to record a covenant promising the ADU will not be rented out for stays shorter than 30 consecutive days, alongside a promise never to sell or transfer the unit apart from the main house.

Key details: Minimum rental term: 30 consecutive days. Restriction form: Recorded declaration of restrictions. Required before: Certificate of Occupancy issuance. Also barred: Selling ADU separately from main house. Applies to: Both ADUs and JADUs.

Renting an ADU for stints shorter than 30 consecutive days breaches the recorded declaration of restrictions required under Section 30-11.2.d, exposing the owner to the city's general code enforcement remedies and Section 1-6.2's default penalty of up to $1,000, up to six months in jail, or both, in addition to any civil action to enforce the recorded covenant itself.

This is one of the stricter rules in Compton's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

The Bottom Line

Compton'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 Compton is broadly strict or permissive.

Keep in mind that Compton can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.