Pre-Approved Accessory Dwelling Unit (ADU) Plans

Pre-Approved ADU Plans

The Pre-Approved ADU Plans Program encourages the construction of new, detached ADUs by offering property owners a selection of Pre-Approved ADU building plans. While some site-specific design work is required, these pre-approved plans aim to help property owners reduce pre-construction costs and improve permit approval efficiency.

Applicants that use a Pre-Approved ADU plan set must submit a complete package through the County’s online portal MyOCService for review and approval. Click here for application guide.

A complete package must include:

The selected pre-approved ADU plan, with completed title sheet
Site Plan that shows property lines, parcel dimensions, and structures
Solar plan prepared by third-party solar installation company
Plan Preparation Checklist
Hold Harmless Statement
Complete WQP/NPP Form
Construction & Demolition Diversion Compliance Work Plan (Completed Sheet 1 and 2)

Click here to access the County’s guide detailing the requirements for developing an ADU.

Below are the six (6) Pre-Approved ADU Plan set floorplans available for download.

The available plans currently reflect the 2022 California Building Code Standards. Please note that we are in the process of updating the plans to reflect 2025 California Building Code and will have the updated plans available soon.

Studio: 393 Sqft