Cost to build accessory dwelling unit

Looking for cost to build accessory dwelling unit in Eugene, OR? Call AccessoryDwellingUnit Solutions for a contact a provider — no obligation. Licensed adu builders serve Eugene 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 budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.

About this service

When calculating the budget for a secondary unit, consider the costs for architectural design, permits, materials, and labor. Custom designs and high-end interior finishes will push your budget higher, while standardized layouts can keep costs more predictable. Exact pricing confirmed free on the call.

Frequently asked in Eugene

What are the disadvantages of ADUs in Eugene?

How much does an ADU cost in Oregon?

The cost to build an ADU in Oregon, including Eugene, varies significantly based on size, design complexity, and material choices. Factors like foundation type and whether plumbing and electrical work needs to be extensive also play a role. For an accurate figure, it's best to get a personalized quote. This comes with no obligation.

What are the rules for ADUs in Oregon?

Oregon has state laws promoting ADUs, but cities like Eugene have their own specific zoning ordinances and building codes. These often cover lot coverage, setbacks, parking, and owner-occupancy requirements. Understanding these local rules is key to a successful project. We can help you find the right advice.

Is an ADU allowed in Eugene?

What are the rules for ADUs in Eugene?

Eugene's ADU rules often include limits on size, mandatory setbacks from property lines, and requirements for off-street parking. You'll need to check your specific zoning district for precise regulations. Getting this information upfront prevents delays and complications. Our service provides direct local guidance.

Are there grants for ADUs in Oregon?

While state-level grants for ADUs aren't always available, it's worth investigating local programs or incentives in Eugene. Some utility companies or housing initiatives might offer financial assistance. Discussing your project with a professional can uncover these possibilities. We can arrange that for you.

Also serving nearby: Salem · Bend · Beaverton · Hillsboro · Portland

All cities in Oregon →

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

Service area details

177,899residents

4,002per sq mile

7ZIP codes served

Serving all of Eugene — population 177,899; about 4,002 residents per square mile across 44.4 sq mi. ZIP codes covered include 97401, 97402, 97403, 97404, 97405, 97408, 97440.

Neighborhoods served in Eugene: Whiteaker, South Hills, Santa Clara, Goodpasture Island, Amazon — and every surrounding area.