ADU Permit in Los Angeles, CA
Permit Summary
ADU Types & Property Eligibility
ADU Type Rules
Los Angeles recognizes local Ordinance ADUs and the ADU types that state law requires the City to approve ministerially. On a single-family lot, qualifying state pathways can combine an ADU created within proposed/existing dwelling or accessory-structure space with one detached new-construction ADU; a JADU may also be allowed. Existing multifamily properties may use internal non-livable-space conversions and detached ADUs, while proposed multifamily projects may use the detached state pathway and, where eligible under the City memo, an attached Ordinance ADU.
Lot / Zoning Eligibility Rules
ADUs are allowed through ministerial pathways on lots with a proposed or existing qualifying primary dwelling. Los Angeles applies its Ordinance ADU rules in areas where single-family or multifamily residential use is permitted, while Government Code Section 66323 requires approval of its specified ADU types in residential or mixed-use zones. Where both single-family and multifamily dwellings exist on a lot, Los Angeles guidance requires use of either the single-family or multifamily ADU pathway rather than combining both sets of options.
Size, Height & Placement
Setback Rules
No setback is required for qualifying conversion of existing living area or an accessory structure, or for a replacement structure built in the same location and to the same dimensions. For other ADUs, side and rear setbacks may not exceed four feet under current state law. Los Angeles may apply otherwise-authorized front-yard and site standards to Ordinance ADUs, but those standards cannot prevent construction of the state-protected 800-square-foot ADU with four-foot side and rear setbacks.
Lot Coverage / FAR Rules
Objective Los Angeles lot-coverage, Residential Floor Area/FAR, open-space and similar development standards can apply to Ordinance ADUs, but they may not be applied so as to prevent an ADU of at least 800 square feet with four-foot side and rear setbacks. ADUs approved under Government Code Section 66323 are exempt from local development and design standards not authorized by that state section.
Attached ADU Rules
Attached ADUs are allowed. For an existing primary dwelling, state law generally limits an attached ADU to 50% of the existing primary dwelling floor area, subject to state minimum-size protections that prevent a local rule from barring an otherwise qualifying 850-square-foot one-bedroom or 1,000-square-foot multi-bedroom ADU. State pathways also allow qualifying ADUs within proposed or existing single-family dwelling space and within qualifying non-livable portions of existing multifamily buildings.
Detached ADU Rules
Detached ADUs are allowed. The Los Angeles Ordinance pathway permits a detached ADU up to 1,200 square feet, subject to applicable objective zoning standards and the City's two-story limit for that pathway. The state new-construction pathway on a single-family lot must allow one detached ADU of up to 800 square feet with no more than four-foot side and rear setbacks and the state-protected height. Existing multifamily lots may have up to eight detached state ADUs, not exceeding the number of existing units; proposed multifamily lots may have up to two.
Conversion ADU Rules
Existing dwelling space and qualifying accessory structures may be converted to ADUs. Under Government Code Section 66323, a qualifying single-family conversion may include up to 150 square feet of expansion solely for ingress and egress; qualifying existing multifamily non-livable spaces may be converted up to 25% of the existing unit count, with at least one allowed. Conversions in the same existing footprint receive state setback protection. Unpermitted ADUs built before January 1, 2020 may use the AB 2533 streamlined legalization process if eligible.
Design, Occupancy & Parking
Design Standards
Ordinance ADUs may be subject to objective Los Angeles zoning, height, historic, specific-plan and other development standards, subject to state protections for minimum ADU size and buildable envelope. ADUs that qualify under Government Code Section 66323 may not be subjected to local objective development or design standards that are not authorized by that section, and ADU approval is ministerial rather than discretionary.
Owner Occupancy Rules
Los Angeles may not require the owner to occupy either the primary dwelling or an ADU. Current Government Code Section 66315 removes local authority to impose an ADU owner-occupancy requirement. This does not apply to JADU owner-occupancy rules, and separate Los Angeles Home-Sharing rules can require primary residency for short-term use.
Parking Rules
An Ordinance ADU may be subject to up to one off-street parking space, but no ADU parking standard may be imposed when a state exemption applies, including when the ADU is within one-half mile walking distance of public transit, in a qualifying historic district, within the primary residence or an accessory structure, where on-street permits are required but unavailable to the ADU occupant, near a car-share vehicle, or submitted with a new primary-dwelling permit. Replacement parking cannot be required when existing parking is demolished or converted for an ADU. State ADUs approved under Government Code Section 66323 are not subject to unauthorized local parking standards.
Rental / Short-Term Rental Rules
An ADU may generally be rented separately from the primary residence without an owner-occupancy requirement. An ADU created under Government Code Section 66323 must be rented for a term longer than 30 days. Los Angeles treats dwelling use as tenancy of 30 days or more, while Home-Sharing is a separate regulated short-term use; an ADU with a complete building-permit application submitted on or after January 1, 2017 may be used for Home-Sharing only if the ADU is the host's primary residence and the City's Home-Sharing requirements are met.
Separate Sale Rules
Ordinary separate sale or conveyance of an ADU from the primary residence is prohibited by Government Code Section 66314, except for statutory exceptions such as a qualifying affordable-homeownership transaction involving a qualified nonprofit corporation and qualified buyer under Section 66341. Los Angeles has been developing an ordinance to implement the optional AB 1033 condominium-sale pathway, but that ordinance remained a pending Missing Middle LA proposal as of September 26, 2026 and is not treated here as current law.
Address, Utilities & Trade Permits
Address Rules
Los Angeles Fire Department guidance cited by City Planning requires separate residential units, including ADUs, to have separate addresses. Address assignment is coordinated through the Bureau of Engineering; legalization of an unpermitted ADU requires a BOE address clearance, and site-specific plan submittals use the assigned or pending project address as directed by the City.
Utility Connection Rules
BOE sewer-capacity and sewer-availability clearance is required for ADUs and JADUs. Project-specific roof-drainage clearance may also be required. Current LADBS guidance states that a detached ADU need not have an independent drainage service connection when the existing service complies with the current plumbing code, requires an accessible separate water shutoff valve and a separate electrical panel for the ADU, and requires LADWP review when work affects or is near a public utility easement. Utility service upgrades and connection/capacity charges depend on project conditions and applicable state exemptions.
Trade Permit Rules
Effective December 31, 2025, Los Angeles issues a combined building-mechanical permit for specified ADU work, including a one-family dwelling with an attached ADU and qualifying detached ADU buildings accessory to one- or two-family dwellings or apartment buildings. That combined permit covers building, electrical, plumbing, heating, ventilation and air-conditioning inspections within its scope. Separate mechanical, electrical, plumbing and fire-sprinkler permits are required for service-feed connections, and separate permits can be required for work outside the combined-permit scope.
Fire, Energy & Special Requirements
Fire / Life Safety Rules
An ADU generally cannot be required to have fire sprinklers when sprinklers are not required for the primary residence, and constructing the ADU does not by itself trigger sprinklers in the existing primary dwelling. Sprinklers may be required when the primary dwelling is already required to be sprinklered or concurrent work independently triggers that requirement. Applicable projects must also meet current smoke-alarm, carbon-monoxide, emergency-egress, fire-resistance and separation requirements, and LAFD hydrant/access clearances may apply.
Energy / Solar Rules
Permit applications submitted on or after January 1, 2026 are subject to the 2025 California Energy Code. A new detached ADU is treated as a newly constructed building for Energy Code purposes and must meet applicable new-residential requirements; prescriptive solar PV is required unless an Energy Code exception applies. New PV modules may be added to an existing system on the same residential lot if allowed by the serving utility. Attached ADUs and conversions treated as additions or alterations do not require solar PV solely because of the ADU work, but applicable Energy Code measures still apply. LADBS exempts qualifying pre-2020 AB 2533 legalization projects from current Title 24 Part 6 compliance.
Special Area / Overlay Rules
Ordinance ADUs can be affected by objective standards in Height Districts, Hillside Areas, Specific Plans, Historic Preservation Overlay Zones and other overlays, subject to state-law limits. Los Angeles guidance states that the local restriction for lots located in both a Very High Fire Hazard Severity Zone and a Hillside Area may not be enforced against State ADUs approved under Government Code Section 66323, and conflicting local sprinkler, parking or off-site-improvement requirements cannot override state ADU law. Historic districts may still trigger the state-authorized notice requirement for demolition of a detached garage to be replaced by an ADU.
Development / Impact Fee Rules
LADBS states that ADUs under 750 square feet are not subject to ADU impact fees; for an ADU of 750 square feet or more, applicable impact fees must be proportional to the ADU's size relative to the primary dwelling. Los Angeles identifies the Residential Development Fee and Dwelling Unit Construction Tax as impact fees, while ADUs/JADUs are exempt from Park Fees and the Affordable Housing Linkage Fee. LAUSD school-district fees apply to ADUs larger than 500 square feet. For eligible pre-2020 AB 2533 legalization by homeowners, impact, connection and capacity charges are waived unless specified health-and-safety utility improvements are necessary and the charge is authorized by state law.
Preapproved Plans
Preapproved Plan Rules
LADBS operates an ADU Approved Standard Plans Program. Private licensed architects and engineers prepare plans that LADBS pre-approves for building, residential and green-code compliance. Use of an approved plan can shorten plan-check review, but the applicant must still submit a Building Permit Application, the City-approved stamped standard plan, and site-specific plans/plot plan; LADBS still reviews zoning, setbacks, foundation conditions and other site-specific requirements before issuing a permit.
Permit & Review Path
Permit / Review Path
Ordinary ADU building-permit applications may be submitted through ePlanLA and are reviewed ministerially by LADBS with required interdepartmental clearances. Applicants may use a custom design or an LADBS Approved Standard Plan with site-specific review. Eligible unpermitted ADUs/JADUs built before January 1, 2020 may use the AB 2533 streamlined legalization path. Current state law requires a completeness determination within 15 business days and, for a completed ADU application on a lot with an existing dwelling, approval or denial within 60 days.
Inspections
Inspection Stages
Construction is inspected in succession before work is concealed or covered. Depending on scope, common LADBS inspection points include foundation excavations, concrete, wood framing, ventilation/mechanical work, plumbing, electrical, shear-wall nailing and roof nailing, followed by final inspection. For legalization work, the inspector may require concealed existing work to be exposed for examination. The Certificate of Occupancy is issued after final inspection approval and all required City clearances are complete.
What You Need Before Applying
Requirements
Obtain a LADBS building permit and complete ministerial plan review. The project must qualify under an applicable state or Los Angeles ADU pathway, be on a lot with a proposed or existing qualifying primary dwelling, comply with applicable zoning and current building, residential, energy, green, fire/life-safety and utility requirements, and obtain project-specific City clearances before permit issuance and Certificate of Occupancy.
Exemptions
There is no general no-permit exemption for creating an ADU. State law exempts qualifying ADUs from certain local development, parking, setback, fee and other standards, but a building permit is still required. An unpermitted ADU or JADU constructed before January 1, 2020 may qualify for the AB 2533 streamlined legalization path, which relaxes specified code and fee requirements but still requires permitting and inspection.
Required Documents
Typical submittals include a completed Building Permit Application and a complete set of plans showing the site, floor plan, elevations, construction and foundation/structural information as applicable. For 2026 permit applications, applicable 2025 Energy Code compliance documents and Los Angeles Green Building Code forms are required. Existing-structure conversions may require prior permits and Certificate of Occupancy records. AB 2533 legalization applications must document that the unpermitted unit was constructed before January 1, 2020. Approved Standard Plan projects also submit the stamped standard plan and site-specific adaptation/plot plan.