Plan a Los Angeles ADU with the right questions first.

First, confirm which agency controls the property.

“Los Angeles” can refer to the City of Los Angeles, another incorporated city, or unincorporated Los Angeles County. Identify the authority having jurisdiction before relying on a checklist, ordinance, fee schedule, or application form.

For property inside the City of Los Angeles, begin with City Planning and the Los Angeles Department of Building and Safety. Their current materials—not a generic web summary—should guide permit preparation.

Build a parcel-specific feasibility brief.

A useful brief combines jurisdiction, parcel geometry, existing conditions, utilities and the exact local standards that affect the proposed approach.

• Property address, assessor parcel information, and responsible jurisdiction.
• Lot dimensions, slope, access, easements, and existing structures.
• Potential detached, attached, conversion, or junior ADU approach.
• Utility routes, electrical capacity, sewer connection, drainage, and fire access.
• Applicable size, height, setback, parking, design, and overlay requirements.

Separate the building price from the total project cost.

A useful early budget includes construction plus design and engineering, surveys, energy documentation, permit and utility costs, site work, demolition, financing, contingency, and owner-selected finishes. Difficult access, hillside conditions, long utility runs, or upgrades to existing systems can materially affect the total.

Verify with official Los Angeles sources.

Use City Planning for current housing policy and zoning context, and Building & Safety for permit, plan-review and inspection information.