Accessory dwelling unit contractor

Looking for accessory dwelling unit contractor in Salem, OR? Call AccessoryDwellingUnit Services for a contact a provider — no obligation. Licensed adu builders serve Salem and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

Building an ADU involves several moving parts that shape your total investment. The final figure depends heavily on whether you choose a prefab unit or a custom build from the ground up. Site conditions are another major factor; if your property requires extensive grading, utility trenching, or foundation work, costs will climb. You also have to consider your choice of finishes, like high-end appliances or custom cabinetry. Navigating local permit fees and impact assessments also adds to the total.

About this service

A contractor oversees the physical build, managing the subcontractors, materials, and daily construction progress. They are responsible for making sure the structure is built according to the approved plans and local safety standards. You need a contractor when you have your designs finalized and are ready for the actual building phase to begin. They act as the primary point of contact for all site activity.

Frequently asked in Salem

What are the rules for ADUs in Salem?

How much does an ADU cost in Oregon?

What are the disadvantages of ADUs?

Potential disadvantages of ADUs include the initial construction cost, possible increases in utility bills, and the need to comply with local zoning and building codes. You'll also want to consider the impact on your existing yard space. Consulting with an expert is a wise first step.

Can I get advice on ADU design in Salem?

What permits are needed for an ADU in Salem?

Permits for an ADU in Salem typically involve building permits, zoning review, and potentially separate permits for plumbing and electrical work. The exact requirements are set by the City of Salem's planning and building departments. A local contractor is familiar with this process.

How does an ADU impact my property taxes in Salem?

Adding an ADU will likely increase your property's assessed value, which can consequently raise your property taxes. The extent of this increase depends on the ADU's size, features, and appraisal. Understanding this potential financial impact is part of your ADU planning.

Also serving nearby: Beaverton · Hillsboro · Portland · Gresham · Vancouver

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More on this: HUD ADU resources — ADU policy and financing research.

Service area details

177,432residents

3,626per sq mile

8ZIP codes served

Serving all of Salem — population 177,432; about 3,626 residents per square mile across 48.9 sq mi. ZIP codes covered include 97301, 97302, 97303, 97304, 97305, 97306, 97308, 97309.

Neighborhoods served in Salem: Northgate, South Salem, West Salem, Downtown Salem, Kroc Center Area — and every surrounding area.