ADU construction in Northwest Oregon gives homeowners a practical way to add a fully functional second unit to their property. Holladay and Sons LLC handles the full scope of work, from site evaluation and design coordination to framing, utility connections, and final inspections. We build detached backyard cottages, attached units, garage conversions, and basement apartments. Oregon state law supports ADU development in residential zones, and local jurisdictions across Northwest Oregon are required to process ADU applications within urban growth boundaries. That means most single-family lots in the region qualify. Northwest Oregon's wet climate calls for tight building envelopes, proper drainage planning, and materials that hold up against persistent moisture. We account for all of that from the start. Whether you want a rental unit, a space for aging parents, or a private guest suite, we build ADUs that function as real homes. Call Holladay and Sons LLC to talk through what your property can support.

What's included

• Adds a fully self-contained living unit to your existing lot without purchasing new land
• Creates a rental income opportunity on your Northwest Oregon property
• Supports multigenerational living by keeping family close while maintaining privacy
• Increases overall property value with a permitted, code-compliant structure
• Built to handle Northwest Oregon's wet climate with proper drainage and moisture-resistant construction
• Covers all project phases from site review and design to utility hookups and final inspection