Required Documents

ADU / Garage Conversion Permit Required Documents in Los Angeles

What documents does LADBS need for a Los Angeles ADU or garage conversion permit application?

Los Angeles ADU Permit Documentation Overview

ADU and garage conversion permit applications in Los Angeles require comprehensive documentation for LADBS plan check review. Submitting complete documentation at the first submission significantly reduces correction cycles and speeds up permit approval.

If you use a pre-approved design from the LADBS Standard Plan Program, the required documentation is streamlined since the design has already been reviewed for building code compliance — only site-specific documents are needed.

Site and Architectural Plans

• Site plan showing property boundaries, setbacks, location of all existing and proposed structures, and

dimensions

• Floor plans of the existing structure and proposed ADU layout showing all rooms, dimensions, and use

of each space

• Elevations (all four sides) showing the overall height, exterior materials, doors, and windows
• Roof plan if roofing modifications are included in the project
• Sections and details as needed to describe construction methods

Structural and Foundation Documents

• Foundation plan showing existing and any new or upgraded foundation elements
• Structural framing plan showing wall, floor, and roof framing
• Shear wall and lateral bracing calculations and schedule
• Engineering calculations prepared by a licensed structural engineer if required
• Soil report if significant foundation modifications are involved

Energy and Mechanical Documents

• California Title 24 energy compliance documentation (CF1R form)
• Electrical plans showing service, panels, circuits, and outlets
• Plumbing plans showing fixture locations, drain, waste, and vent routing
• HVAC plans showing equipment, ductwork, and ventilation if a new system is being installed

• Title 24 solar-ready documentation if applicable

Administrative and Supporting Documents

• Completed LADBS permit application forms
• Applicant and contractor information including CSLB license numbers
• Assessor's parcel number (APN) and current assessor records
• For garage conversions with nonconforming setbacks: permit for original garage construction or

assessor records confirming legal status

• Sanitation fee receipt for new sewer connections
• School district fee receipt if the ADU exceeds 500 square feet
• Utility 'will serve' letter from water purveyor if required

Using LADBS Standard Plans to Simplify Documentation

The LADBS Standard Plan Program provides pre-approved ADU designs that have already been reviewed for California Building Code compliance. Selecting a standard plan eliminates the need for full architectural and structural design documentation — you only need to submit site-specific documents (site plan, foundation details, Title 24 calculations). This significantly reduces both the documentation burden and plan review time.

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