TL;DR (generated, confidence: high)

When moving into a commercial space, making alterations, or changing its use, you need a building permit and may need trade permits depending on the project.

Key points:

Building permit required for moving into a commercial space, making alterations, or changing how you use the space (Changing a commercial space > Prepare > Create detailed plans ↗)
Trade permits may also be required depending on your specific project (Changing a commercial space > Prepare > Create detailed plans ↗)
Navigation menu available to find information about each step of the process (Changing a commercial space > Prepare > Create detailed plans ↗)
Custom project guide available at /ppd/commercial-permitting/changing-commercial-space/project-guide (Changing a commercial space > Prepare > Create detailed plans ↗)

Entities: permit_type: Building permit · Trade permits | location_type: Commercial space

ADU conversions > Prepare > Create detailed plans

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Breadcrumb: Home > Permitting & Development > Residential Permits and Inspections > ADU conversions > Prepare > Create detailed plans

Source: ADU conversions > Prepare > Create detailed plans ↗ Last modified: Sun, 19 Apr 2026 20:06:06 GMT

Converting an existing part of your home to an accessory dwelling unit (ADU) increases housing and boosts your home’s value. These pages explain the permits you'll need for an ADU conversion and how you can apply for them. Use the navigation menu to learn more about each step.

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