ADU Infographic showing an example of an internal, attached, and detached adu

Accessory Dwelling Units (ADU's) are small secondary living units that are located on the same property of an existing Single-family dwelling or in an existing Single-family dwelling. 
ADU's can benefit our community by providing needed affordable housing, additional space for elderly or returning family members, and it could help with homeownership by offsetting mortgage costs.
 

ADU's are reviewed by Planning as part of the Building Permit Review.  

 

Below are some of the Development Standards. code 15.445.250

LOCATION:

  • Accessory dwelling units are outright permitted uses in the R-1, R-2, R-3, RP, I and AR zones.
  • Accessory dwelling units are a conditional use in the C-2 and C-3 zones, must obtain a Type III Conditional use permit approval.

LIMITATIONS:

An accessory dwelling unit is permitted, providing there is compliance with all of the following standards:

  • An accessory dwelling unit may be created within the interior or as an addition to an attached or detached residential structure or as a freestanding accessory building.
  • An accessory dwelling unit may not exceed 50 percent of the size of the primary unit, up to a maximum of 1,000 square feet.
  • The number of residents permitted to inhabit the accessory dwelling unit is regulated by the current edition of the Oregon Residential Specialty Code.
  • The primary residence shall provide parking per NMC 15.440.030. The accessory dwelling unit does not require on-site parking.
  • Owner occupancy of the primary unit or accessory dwelling unit is not required.
  • An accessory dwelling unit cannot be partitioned or subdivided from the parcel of the primary unit if there are shared water and wastewater lines.
  • There shall be compliance with all of the development standards established in the base zone

See Attached Accessory Dwelling Units Standards.

SYSTEM DEVELOPMENT CHARGES (SDCs):

Accessory Dwelling Units are subject to System Development Charges (SDCs). The City has adopted an SDC fee reduction incentive to encourage production of smaller, more affordable houses, effective April 1, 2024. City Council adopted Ord2922, that amended NMC section 13.05 to allow an applicant to request reduction of System Development Charge (SDC) fees by twenty percent (20%) for projects that meet the criteria in amended section 13.05.040(C). This criteria apply to single-family dwelling units of 1,000 square feet or less.

If you are submitting an ADU Dwelling Unit that is not attached to an existing structure and 1,000 SqFt or less, click HERE for the SDC Modification Request Form.  This form must be submitted with the building permit for Engineering to review.  Submittal of this form does not guarantee a SDC reduction. You can find additional information about the SDC revisions HERE or by emailing engineering@newbergoregon.gov or 503-537-1273.