The size of an ADU allowed in Eugene, Oregon, depends on a few factors, such as the property’s zoning district and the size of the primary dwelling. 

Generally, the maximum size for an ADU in Eugene is 800 square feet or 75% of the primary residence, whichever is smaller. However, the full size can vary by zoning district, so it’s important to check the specific regulations for your property.

It’s also worth noting that additional requirements for ADUs in Eugene may be related to setbacks, height, parking, and other factors. 

It’s a good idea to consult with the City of Eugene’s planning and development department or a licensed contractor familiar with the local regulations to ensure that your ADU plans comply with all applicable requirements.

There are several requirements for building an ADU in Eugene, Oregon. Some of the essential requirements include:

  1. Zoning: The property must be located in a zone allowing ADUs. In Eugene, ADUs are allowed in most residential zones.
  2. Size: The maximum length of an ADU in Eugene is 800 square feet or 75% of the size of the primary dwelling, whichever is smaller.
  3. Setbacks: There are specific setback requirements for ADUs in Eugene, which vary depending on the zone and the property’s location.
  4. Parking: In most cases, one off-street parking space is required for the ADU. However, there are some exceptions for properties located in certain areas or with specific characteristics.
  5. Design: ADUs in Eugene must meet specific design standards, such as matching the architectural style of the primary dwelling and being located in a way that maintains privacy for neighboring properties.
  6. Owner occupancy: At least one of the units on the property (either the primary dwelling or the ADU) must be owner-occupied.

Yes, the City of Eugene in Oregon does offer pre-approved ADU designs that have been reviewed and approved by the City.

These designs can make building an ADU faster and easier, as they have already been reviewed for compliance with local regulations and building codes.

The pre-approved designs are available for attached and detached ADUs in various sizes and styles. They are designed to be flexible enough to accommodate different site conditions and can be customized to fit the specific needs of a property owner.

To access the pre-approved ADU designs, visit the City of Eugene’s website or contact the planning and development department for more information. However, it’s important to note that even with a pre-approved design, you will still need to obtain the necessary permits and approvals from the City before construction can begin.

The cost of building an ADU in Eugene, Oregon, can vary widely depending on several factors, such as the size and complexity of the unit, the materials used, and the specific site conditions.

However, according to recent estimates, the average cost of building an ADU in Eugene is between $100,000 and $300,000.

It’s important to remember that these are rough estimates, and costs can vary widely depending on your needs and circumstances.

For example, your prices may be higher using high-end materials or a complex design. In addition, site preparation costs, such as grading or utility connections, can add to the project’s overall cost.

To get a more accurate estimate of the cost of building an ADU on your property in Eugene, it’s a good idea to work with a licensed contractor or architect with ADU construction experience in the area. They can provide a detailed cost estimate based on your needs and budget.

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