TL;DR (generated, confidence: high)

File preparation guidelines for ADU conversion permit applications specifying naming conventions, plan requirements (size, scale, format, legibility), and submission standards for digital and in-person submissions.

Key points:

Use clear file names without personally identifying info: 'Building Permit Application.pdf', 'Zoning Permit Application.pdf', 'Owner Doing Work Form.pdf', 'Plan Set.pdf' (ADU conversions > Prepare > Prepare your files ↗)
All drawings must be the same sheet size; digital plans submitted as single PDF named 'Plan Set.pdf' (ADU conversions > Prepare > Prepare your files ↗)
Site plan scale minimum 1 inch = 10 feet; must include north arrow and use 12-point font for dimensions/notes (ADU conversions > Prepare > Prepare your files ↗)
Plans must be black and white, clearly legible, reproducible, and cannot be password-protected (ADU conversions > Prepare > Prepare your files ↗)
In-person paper submissions require substantial paper stock, black and white copies only, permanent black ink (ADU conversions > Prepare > Prepare your files ↗)
Contact 503-823-7300 to schedule in-person appointment for submitting paper materials (ADU conversions > Prepare > Prepare your files ↗)

Entities: concept: ADU | filename: Plan Set.pdf | scale_specification: 1 inch = 10 feet | format_specification: 12-point font | phone_number: 503-823-7300

ADU conversions > Prepare > Prepare your files

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Source: ADU conversions > Prepare > Prepare your files ↗ Last modified: Sun, 19 Apr 2026 20:06:11 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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Prepare your files

We ask you to follow certain rules to make sure our system can process the documents you send us. It’s good to keep in mind that all your files and drawings should be very clear and organized.

Here are a few specific rules:

File naming

All your files should have really clear names. Don't put any personally identifying info in the file names. Use these names, or similar:

Building Permit Application.pdf
Zoning Permit Application.pdf
Owner Doing Work Form.pdf
Plan Set.pdf

For all site and structural plans

All drawings should be the same sheet size.
Send digital plans as a single PDF file with this name: Plan Set.pdf.
Draw your site plan to a scale of 1 inch = 10 feet or more.
Include a north arrow.
Plans must be in black and white, clearly legible, and reproducible.
Use 12-point font for all dimensions and notes.
Don't send files that are password-protected.

If you're submitting your application materials in person:

Your plans need to be on substantial paper.
Black and white copies only.
Use permanent black ink.

We will scan your paper plans and review them digitally. Call 503-823-7300 to get help setting up an in-person appointment.