Los Angeles ADU Permitting Made Simple

Professional, city‑specific guidance for homeowners and developers navigating Los Angeles ADU requirements.

3,820,914 residents · 1299 km²

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Local Authority

Los Angeles has embraced Accessory Dwelling Units as a solution to housing demand, and the city’s Planning Department enforces the 2020 ADU Ordinance (LA Code § 151.00). That ordinance defines allowable size, setbacks, and parking exemptions, while the Building Code requires Title 24 energy compliance and structural review. Our team knows the exact documentation the city expects, from site plans that show property lines and existing structures to the required soils report for hillside lots. By aligning every drawing and calculation with local rules, we help you avoid costly revisions and keep your project on schedule.

Complete Permit Checklist for Los Angeles ADUs

Every ADU package must include a site plan that displays property boundaries, required setbacks, and any existing buildings. The floor plan should detail room dimensions, door locations, and the connection to the main house. Exterior elevations and sections must illustrate façade materials, roof pitch, and height relative to the primary residence. An electrical single‑line diagram is needed to show service upgrades and load calculations, while Title 24 compliance documentation proves the unit meets state energy standards. Structural calculations verify that the new unit can safely support its intended use, and a soils report is required for any lot with a slope greater than 2:1.

Los Angeles also mandates a pre‑application meeting for projects over 1,200 square feet, and the Neighborhood Review Board may request additional landscaping plans for certain zones. Submitting all items together reduces the typical 30‑day review period, allowing you to move from design to construction without unnecessary delays.

Common Project Types

Detached ADU

Standalone unit on your lot, meeting LA setback and height limits.

Attached ADU

Unit sharing a wall with the primary residence, with interior access.

Garage Conversion

Transform an existing garage into a livable ADU while preserving parking.

In‑Lot ADU

Compact unit built within the footprint of the main house, ideal for dense zones.

Building Department

Authority: Los Angeles Department of Building and Safety
Address: 201 N. Main St., Los Angeles
Permit Portal: ePlanLA
Fees: Fees are based on project size and scope; a detailed estimate is provided during the consultation.

Frequently Asked Questions

How long does the Los Angeles ADU permit process usually take?

When all required drawings and calculations are submitted together, the city typically completes its review within 30 days. Larger projects that need a pre‑application meeting or a soils report may take a few weeks longer.

Do I need a separate parking space for my ADU in Los Angeles?

The 2020 ADU Ordinance waives the parking requirement for most units, provided the property is within a half‑mile of public transit or the primary residence has an existing garage.

Can I build an ADU on a sloped lot?

Yes, but a geotechnical soils report is required for slopes steeper than 2:1. The report must be included with the structural calculations to satisfy the Building Department.

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Nearby Cities

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