Building Code Guide 00-10: Accessory Dwelling Units (ADU)
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Source: Building Code Guide 00-10: Accessory Dwelling Units (ADU) ↗ Last modified: Sun, 19 Apr 2026 20:05:57 GMT
BCG 00-10: ADU Code Guide
QUESTION: What building code modifications are allowed for accessory dwelling units (ADUs)?
RESPONSE: ADUs must comply with the requirements of the Oregon Residential Specialty Code (ORSC) for two-family dwellings as modified by the alternative standards listed in this Code Guide. The ORSC and the alternative standards listed in this guide also apply when an ADU is created within an existing detached or attached structure. However, if the building containing the ADU is subject to the Oregon Structural Specialty Code (OSSC), the ADU must comply with the requirements of the OSSC; this guide does not apply.
Construction Standards