A duplex, triplex or cottage cluster in Oregon can be built on one lot and then divided so each unit sits on its own lot and can be sold separately. ORS 92.031 calls this a middle housing land division, and it limits what a city or county can ask for.
What the application must include
A middle housing proposal that complies with the Oregon Residential Specialty Code and applicable land use rules.
Separate utilities for each dwelling unit.
Easements for utilities, pedestrian access, common areas and any shared driveways or parking.
Exactly one dwelling unit on each resulting lot, except lots or tracts held in common.
Evidence that the buildings will meet building code provisions for new property lines.
What the city can and cannot do
It must approve a tentative plan that includes those items.
It applies the expedited land division procedures in ORS 197.360 to 197.380.
It may require street frontage improvements and right of way dedication where the original parcel did not provide them.
It may not add approval criteria beyond the statute, such as its own driveway or parking standards.
It may prohibit further division of the new lots and require a plat notation.
It may let the building permit be filed together with the land division.
Timing
Tentative approval is void only if a final plat is not approved within three years. That gives owners room to build first and divide later, or to file the building permit and the division together.
Where projects get stuck
Utilities that were designed shared, which have to be separated for the division.
Fire separation at the new interior property lines, which has to be in the building design from the start.
Easements that were never drawn for access and maintenance.
Frequently Asked Questions
Can I sell each unit of a duplex separately in Oregon?
Yes, through a middle housing land division under ORS 92.031, which puts exactly one dwelling unit on each resulting lot.
Can the city deny it for parking or driveway standards?
The statute bars cities from adding approval criteria beyond its list, and names driveways and parking as examples.
How long is tentative approval good for?
It is void only if a final plat is not approved within three years.
Sources
Insights are general information researched from published sources on the date shown. Rules change, so confirm with the permitting authority before you act.
