Oregon Land Use Laws Explained: What Homebuyers Need to Know in 2026

Oregon has the most regulated land use system in the United States. Since 1973, when the legislature passed Senate Bill 100, every city and county has been required to adopt comprehensive plans that comply with 19 statewide planning goals. The most consequential of these is the Urban Growth Boundary — a line drawn around every Oregon city that separates urban land from farm and forest land. UGBs determine where development can happen, which directly controls housing supply, home prices, and the character of Oregon communities. If you’re buying property in Oregon, these rules affect what you can build, where you can build it, and how much you’ll pay.

The Urban Growth Boundary: Oregon’s Defining Land Use Tool

Every incorporated city in Oregon has a UGB — a legally defined perimeter beyond which urban development is prohibited. Inside the boundary, cities can zone for residential, commercial, and industrial uses. Outside, land is reserved for farming, forestry, or low-density rural use. The boundaries are not fixed forever — cities can petition to expand them — but the process is slow, expensive, and heavily contested.

Portland’s UGB is managed by Metro, the only elected regional government in the United States. Metro reviews the boundary every 6 years and can add land if it determines that the existing supply within the boundary is insufficient for 20 years of projected growth. Other cities manage their UGBs through individual petitions to the state’s Land Conservation and Development Commission (LCDC).

Oregon’s 19 Statewide Planning Goals

Senate Bill 100 established the Department of Land Conservation and Development (DLCD) and created 19 planning goals that every local comprehensive plan must address. The goals most relevant to homebuyers and property owners:

Goal 10 is particularly important for housing supply. It requires every city to maintain a Buildable Lands Inventory and zone enough land to accommodate projected housing needs, including affordable housing. This goal was the legal basis for Oregon’s 2019 middle housing legislation (HB 2001).

HB 2001: The End of Single-Family-Only Zoning

In 2019, Oregon became the first state to effectively ban single-family-only zoning. House Bill 2001 requires:

• Cities with 25,000+ population: Must allow duplexes, triplexes, fourplexes, and cottage clusters on any lot previously zoned for single-family homes
• Cities with 10,000–25,000 population: Must allow duplexes on all residential lots
• Implementation deadline: June 30, 2022 (most cities have complied, though some are still refining their codes)

The practical impact for homebuyers: any single-family lot in Portland, Eugene, Salem, Bend, Beaverton, or other large Oregon cities can potentially be redeveloped as a fourplex. This affects neighborhood character over time, but also creates opportunities for buyers interested in house-hacking (living in one unit, renting the others) or investors seeking multi-unit conversions.

HB 2001 does not override existing deed restrictions, CC&Rs, or HOA rules — but it does override city zoning codes. If your HOA prohibits multi-family development, that restriction stands regardless of HB 2001.

Exclusive Farm Use (EFU) and Forest Zoning

Roughly 25 million acres of Oregon — about 40% of the state — is zoned for Exclusive Farm Use (EFU) or forest use. These designations severely limit what you can build:

If you’re looking at rural property in Oregon, verify the zoning before making an offer. A beautiful 20-acre parcel in the Willamette Valley may be zoned EFU with no ability to build a home unless you can prove commercial farm use. County planning departments can confirm zoning and development eligibility — call before you buy. Check the property tax implications of different land types, as EFU and forest-zoned properties have different assessment rules.

How Land Use Laws Affect Home Prices

Oregon’s UGB system creates a direct supply constraint on developable land. Economic research consistently shows that UGBs increase home prices within the boundary by restricting the supply of buildable lots. The magnitude varies by study, but estimates suggest Portland’s UGB adds 10–20% to home prices compared to a market without growth boundaries.

The flip side: UGBs protect agricultural land, prevent sprawl, reduce infrastructure costs, and maintain the rural character that makes Oregon attractive. Portland’s UGB is the reason the Willamette Valley still has working farms 20 minutes from downtown, while comparable cities (Nashville, Charlotte, Phoenix) have sprawled across former farmland for miles.

Accessory Dwelling Units (ADUs)

Oregon law requires all cities to allow ADUs (sometimes called granny flats, backyard cottages, or in-law units) on residential lots. Portland has been particularly aggressive in promoting ADUs:

• No off-street parking requirement for ADUs
• System development charges (SDCs) waived through 2028 (saves $15,000–$20,000)
• ADUs can be detached or attached, converted garages, or basement units
• Maximum size: 75% of the primary dwelling’s living area or 800 sq ft, whichever is less (Portland; other cities vary)

Portland has permitted over 3,500 ADUs since 2010 — more than any city in Oregon. ADU construction costs $150,000–$300,000 for a detached unit in the Portland metro. Rental income from an ADU ($1,200–$1,800/month in Portland) can significantly offset mortgage payments. ADUs are also a path to building equity through the middle housing provisions of HB 2001. Use our renovation ROI calculator to evaluate whether ADU construction makes financial sense for your property.

What Buyers Should Check Before Purchasing

Oregon’s land use system creates several due diligence items that don’t apply in most other states:

• Zoning confirmation: Verify the property’s current zoning and what uses are permitted. Don’t assume a residential-looking property is zoned residential.
• UGB status: Confirm the property is inside the UGB if you want urban services (sewer, water, paved roads). Properties outside the UGB may be on wells and septic.
• Comprehensive plan designation: The comp plan may designate the area for future rezoning (e.g., from single-family to mixed-use). This can affect long-term neighborhood character and your home’s value.
• Development overlays: Check for environmental overlays (wetlands, steep slopes, flood zones) that restrict what you can do on portions of the property.
• Measure 49 claims: Some rural properties have Measure 49 claims (vesting rights to develop despite current zoning restrictions). If you’re buying rural land, ask about any existing claims.
• Pending UGB amendments: If the city is considering expanding the UGB near your property, it could bring increased density and traffic. Conversely, if your property is outside the UGB in a proposed expansion area, future urbanization could increase its value.

Your buyer’s agent should help with this research, but ultimately the county planning department is the authoritative source. Use our affordability calculator to model how zoning-driven density changes might affect property values in your target area.

Recent and Proposed Changes

Oregon’s land use system continues to evolve:

• HB 3414 (2023): Created the Housing Accountability and Production Office to accelerate housing production and review local zoning barriers
• Climate-Friendly and Equitable Communities (CFEC): DLCD rules requiring large cities to reduce car dependency through zoning changes — more mixed-use development near transit
• ADU expansion: Ongoing legislative efforts to further reduce barriers to ADU construction, including pre-approved ADU designs
• UGB reform proposals: Some legislators advocate for speeding up UGB expansion in cities with severe housing shortages

These changes reflect a growing tension in Oregon politics between preserving the land use system’s farmland protections and addressing the state’s housing affordability crisis. The broad political consensus supports maintaining UGBs while finding ways to build more housing within them — primarily through density increases, middle housing, and infill development rather than boundary expansion.

Compare With Other States

Considering other markets? Here’s how other states compare:

• Oklahoma Landlord-Tenant Laws: What Renters Need to Know in 2026
• Flood Zones and Insurance in New Jersey: What Property Buyers Must Know
• Earthquake Zones in Washington: What Property Buyers Must Know

Frequently Asked Questions

Can I build a second home on my rural Oregon property?

It depends on the zoning. On EFU-zoned land, building a second dwelling requires demonstrating a farm connection (accessory farm dwelling for a relative or employee). On forest-zoned land, second dwellings are generally prohibited. On rural residential-zoned land, you’re typically limited to one dwelling per lot. Partitioning the land to create a second lot may be possible in some cases but requires county approval and compliance with minimum lot sizes. Always consult the county planning department before assuming you can build.

How does Oregon’s system compare to other states?

Oregon’s system is the most centralized in the country. Most states leave land use planning entirely to local governments. Oregon requires local plans to comply with state goals, enforced by the state through DLCD and the Land Use Board of Appeals (LUBA). Hawaii has a similar statewide system, and several states (Washington, California, Colorado) have adopted elements of Oregon’s approach, but none match Oregon’s 50-year track record of statewide land use planning.

Do UGBs make housing more expensive?

Yes, but by design. UGBs restrict the supply of developable land, which increases lot prices and therefore home prices. Research estimates a 10–20% price premium in Portland attributable to the UGB. However, UGB supporters argue that without the boundary, infrastructure costs (roads, sewers, schools) for sprawling development would be even more expensive — costs that ultimately land on taxpayers and homebuyers through property taxes and utility rates.

What is LUBA and why does it matter?

The Land Use Board of Appeals (LUBA) is Oregon’s specialized court for land use disputes. Any land use decision by a city or county can be appealed to LUBA, and appeals are common. LUBA decisions can delay development projects by months or years. If you’re buying a home in a new development or planning to develop property yourself, understand that LUBA appeals are a real risk that can halt construction mid-project. Check if the development’s land use approvals have cleared the LUBA appeal window (21 days from the decision) before purchasing.

Can I convert my single-family home into a duplex or fourplex?

Under HB 2001, yes — if you live in a city with 25,000+ population and the lot meets minimum size requirements (typically 5,000 sq ft for a duplex, larger for tri- and fourplexes). You’ll need building permits, must meet current building code, and the conversion must comply with setback and height limits. HOA restrictions may still apply. Portland’s Bureau of Development Services has pre-approved designs for some middle housing types to simplify the permitting process. The home services section of our site covers renovation and conversion costs.