An Oregon middle housing land division lets eligible homes be sold on separate lots. It does not automatically authorize another dwelling on each new lot. The housing type approved for the original property remains unchanged, and the new boundaries must account for building-code compliance, utilities and access. ORS 92.031, as amended in 2026

The process originated with SB 458 in 2021. This guide reflects the law as of September 17, 2026, including subsequent amendments.

Which properties and housing types qualify?

Start with the original property's zoning and permitted development. The statutory route covers parcels where middle housing is allowed under ORS 197A.420(2) or (3), or 197A.421. These provisions concern qualifying urban residential land; they do not establish a general right to divide rural lots. Housing types include duplexes, triplexes, quadplexes, cottage clusters and townhouses, with provisions for qualifying retained housing and accessible or affordable bonus units. Oregon's middle-housing statutes

Confirm local implementation before relying on an expanded housing allowance. HB 2138 gives cities until January 1, 2027, to implement specified expansions, and until January 1, 2028, for its cottage-cluster changes. In September 2026, a newly expanded definition or bonus may not yet apply to the property. HB 2138, sections 1–4

Do the resulting lots get rights to additional homes?

An application ordinarily must provide exactly one dwelling per resulting lot. Exceptions cover common-area lots or tracts and qualifying retained housing under ORS 197A.420(4): an existing house with an accessory dwelling unit (ADU), or an existing duplex, can remain together on one resulting lot. The retained-housing exception does not give every buyer permission to add another unit. ORS 92.031(2) and (4)

State law allows cities and counties to prohibit or impose approval criteria on new ADUs and subsequent middle housing land divisions. That authority has limits: restrictions must stay within the governing statutes and preserve the ability to create housing at or above the land's minimum zoned density. A statewide statement that ADUs are always forbidden would therefore overstate the law. ORS 92.031(3), (5) and (6)

For acquisition analysis, distinguish the number of saleable lots from the number of permitted homes. A larger backyard on one new lot is not evidence of additional development rights.

Which development standards survive the split?

The proposal must satisfy applicable land-use regulations for the original parcel and the Oregon Residential Specialty Code. The application must also demonstrate building-code compliance in relation to the new property lines. Land-division approval does not replace building review. ORS 92.031(2)

Portland illustrates the distinction. Its Chapter 33.253 applies zoning regulations to the resulting lots collectively, including measuring zoning setbacks from the original site's boundaries. It preserves the development's housing type and expressly prohibits ADUs and further division of resulting lots. Read those local provisions alongside the state-law qualifications above. Portland Chapter 33.253, effective June 30, 2022

A line that works under zoning and land-use rules may still require building-code analysis. Have the designer and building official evaluate the proposed boundaries before treating the lot layout as settled.

Utilities and easements must support separate ownership

The amended state statute requires separate utilities other than water and wastewater for each dwelling. It allows the local government to require separate water and wastewater utilities too. Obtain the jurisdiction's service requirements before assuming existing connections can remain shared. ORS 92.031(2)(a) and (4)(g)

The application must propose necessary easements—rights to use or enter another lot—for these purposes under ORS 92.031(2)(c):

• Utility placement, access, replacement and servicing.
• Pedestrian access from each home to a public or private road.
• Shared building elements and common-use areas.
• Dedicated driveways, parking and common areas.

Portland example: reserve room for future repairs

Portland's approval standards require verification of water, sanitary sewer and stormwater service availability. Its Private Plumbing Easements guide, approved May 29, 2024, provides for approved lines crossing other properties and shared sewers for middle housing land divisions when Environmental Services allows them.

Under that guide, a plumbing easement ordinarily must be at least 10 feet wide. It may narrow to 5 feet where installation and repair can occur without conventional open-trench excavation in the narrower portion; other reductions require an appeal. Reserve space for utility routing early in development and land planning, before fixing a compact site's layout.

How approval, building permits and recording fit together

Keep three milestones distinct:

1. Tentative approval. State law requires acceptance of a middle housing land-division application before, after or alongside a building-permit application. Applicants can request expedited land-division procedures, which generally require a decision within 63 days after the application is complete. That clock concerns the land-use decision, not completion of construction or recording.
2. Building compliance and approval conditions. Coordinate the development plans, new boundaries and services. State law permits a jurisdiction to require the final plat before issuing building permits, so confirm the local sequence instead of assuming construction must come first.
3. Final plat approval and recording. A plat is the surveyed legal map of the division. Tentative approval does not constitute final acceptance for recording. Generally, the lots cannot be sold until the plat is acknowledged and recorded; private easements shown on the plat become effective upon recording.

These requirements appear in the 2026 amendments, sections 27–28 and ORS 92.025, 92.040 and 92.050.

The ordinary deadline for final-plat approval is three years after tentative approval. Effective June 5, 2026, the statute also allows a period equal to that allowed for a concurrently submitted plat or plan under ORS 92.044. Verify the applicable deadline in the project file. HB 4037, sections 27 and 31

A four-home example: price the approved development

Suppose an investor proposes an eligible fourplex and a division placing each home on its own lot. Assume the project receives the necessary approvals and the plat is recorded. The investor can sell the homes separately, but the split itself has not authorized four additional ADUs.

If a rear home's utility line crosses a front lot, the proposed easement must support access and repairs. Compare that route with an independent connection: a cheaper installation may leave future owners with more complicated maintenance responsibilities.

Budget for survey and plat preparation, application and recording charges, legal documents, utility work and any building modifications. Ask the local planner, surveyor and an Oregon land-use attorney to review the proposal and restrictions before committing to a purchase. Then use local housing research to test sale-price assumptions against the homes and ownership rights the project can actually deliver.