Oregon’s occupancy laws pull from three sources at once: the state building and residential specialty codes that set minimum safety standards, local zoning that controls how a property can be used, and the Oregon Residential Landlord and Tenant Act that governs rentals. Together they decide when a space can be occupied, how many people can live there, what a landlord must maintain, and how much rent can go up each year. For 2026, most annual rent increases are capped at 9.5%, occupancy limits cannot be more restrictive than two people per bedroom, and building code violations can carry civil penalties up to $5,000 per offense or $1,000 per day.
Residential and Commercial Properties Follow Different Rules
The first fork in Oregon occupancy law is whether a space is residential or commercial. Residential rentals fall under the Oregon Residential Landlord and Tenant Act, ORS Chapter 90, which gives tenants substantial protections around habitability, eviction, and rent increases.1Oregon State Legislature. Oregon Revised Statute Chapter 90 – Residential Landlord and Tenant Commercial spaces are governed primarily by the lease agreement itself under general contract law, with far fewer statutory safeguards for tenants.
The Oregon Structural Specialty Code, based on the 2024 International Building Code, then assigns each building an occupancy classification that drives fire safety, accessibility, and structural requirements.2Building Codes Division. Oregon Structural Specialty Code Adoption Residential buildings fall into Group R (apartments, condos, single-family homes, short-stay lodging). Commercial buildings sit in Group B for offices, Group M for retail, or Group F for manufacturing and warehousing.3ICC Digital Codes. Chapter 3 Occupancy Classification and Use – Oregon Structural Specialty Code Each classification carries its own requirements for sprinklers, ventilation, egress, and radon control.4Oregon.gov. 2025 Oregon Structural Specialty Code – Code Review Committee Matrix
Using a property outside its designated classification invites enforcement. Converting a warehouse into living quarters without meeting residential ventilation, egress, and fire suppression standards is unlawful. Running a business out of a home beyond what local home occupation rules allow can trigger zoning violations. Anytime the way a building is used changes, the occupancy classification likely changes with it, and so do the standards the space must meet.
Certificate of Occupancy Requirements
No building in Oregon can legally be occupied until the local building official issues a certificate of occupancy. The Oregon Residential Specialty Code makes this explicit for new homes, duplexes, and accessory dwelling units, and the same principle applies to commercial buildings under the OSSC.5Oregon.gov. ORS 455.055 – Uniform Permit, Inspection and Certificate of Occupancy Requirements The certificate confirms that the structure passed all required inspections (building, electrical, plumbing, mechanical, and site development) and is safe for its intended use.
When work is nearly finished but not complete, the building official can issue a temporary certificate of occupancy as long as minimum fire and life safety requirements are met. Temporary certificates come with time limits and are typically extended in short increments.
The certificate matters beyond initial construction. Changing a building’s use, such as converting a retail space into a restaurant or turning a single-family home into a duplex, generally requires a new certificate reflecting the updated occupancy classification. Skipping this step can result in code enforcement orders to vacate the building until compliance is achieved.
Minimum Space and Safety Standards
Oregon’s Residential Specialty Code sets hard minimums for room size, ceiling height, light, ventilation, and emergency egress. A unit that falls short is legally uninhabitable, and it cannot be rented as one.
Room Size and Ceiling Height
Every dwelling must have at least one habitable room with a minimum floor area of 70 square feet. All other habitable rooms other than kitchens must measure at least 7 feet in every horizontal direction.6Clackamas County Department of Transportation and Development. Summary of Residential Structural and Mechanical Code Requirements – 2021 Edition of the Oregon Residential Specialty Code Ceiling height must reach at least 7 feet in habitable spaces. For rooms with sloped ceilings, at least half of the required floor area must hit that 7-foot mark, and no portion of the room counted toward the minimum area can be lower than 5 feet.
Light, Ventilation, and Emergency Exits
Habitable rooms need natural light through windows or glazing equal to at least 8% of the room’s floor area. At least half of that glazed area must be openable for ventilation, though mechanical ventilation can substitute if it meets code. Every sleeping room must also have at least one emergency escape and rescue opening, typically a window large enough to climb through, that opens directly to a public way, yard, or court at least 36 inches wide.7Oregon.gov. 2023 Oregon Residential Specialty Code Amendments – Section R310 A basement bedroom in a home with an automatic sprinkler system can get an exception, but only if the basement has two separate means of egress, or one egress route plus one escape opening elsewhere.
These requirements catch a lot of landlords off guard when converting basements, attics, or storage rooms into rentable bedrooms. A room that lacks a compliant escape opening or adequate ceiling height cannot be advertised as a bedroom, and renting it as one creates both code enforcement exposure and liability if someone is injured.
How Many People Can Live in a Rental
Oregon caps how restrictive a landlord can be in setting occupancy limits. Under ORS 90.262, any occupancy rule a landlord adopts cannot be more restrictive than two people per bedroom.8OregonLaws. ORS 90.262 – Use and Occupancy Rules and Regulations Beyond that floor, the limit has to be reasonable, and Oregon fair housing law prohibits any rule that discriminates against families with children.9Oregon State Legislature. Oregon Revised Statutes 659A.421 – Discrimination in Selling, Renting or Leasing Real Property Prohibited
What counts as reasonable turns on a few things:
- Bedroom size. A 70-square-foot bedroom that barely qualifies as habitable space may reasonably support fewer occupants than a large master suite.
- Overall unit size, not just bedroom count.
- Whether the limit disproportionately excludes families with children.
The two-per-bedroom baseline aligns with federal HUD guidance, which also considers the age of children, the configuration of the unit, and the capacity of building systems like plumbing and septic. In practice: a landlord who limits a two-bedroom apartment to two people total is almost certainly violating the law. A landlord who limits it to four is on solid ground. Anything in between depends on the unit.
For a room to count as a bedroom under ORS 90.262, it must be a habitable room intended primarily for sleeping, contain at least 70 square feet, and be configured with fire exit access in mind.8OregonLaws. ORS 90.262 – Use and Occupancy Rules and Regulations A landlord who calls a converted closet or windowless den a “bedroom” to justify a higher occupancy is on shaky legal and code-enforcement ground.
Oregon has no statewide law defining when a guest becomes an unauthorized occupant. Landlords typically address this through the lease. A common clause limits guest stays to 14 days within a six-month period, after which the guest may be treated as a tenant who needs to be added to the lease. Any occupancy-related rule is only enforceable if it is clear enough for the tenant to understand and was provided in writing when the lease was signed or the rule was adopted.8OregonLaws. ORS 90.262 – Use and Occupancy Rules and Regulations
Zoning, Home Businesses, and Short-Term Rentals
Oregon’s land use system gives cities and counties broad authority to regulate what happens on each parcel. ORS Chapter 215 governs county land use planning, ORS Chapter 227 covers cities, and the Department of Land Conservation and Development provides statewide oversight.10Oregon State Legislature. Oregon Revised Statute Chapter 227 – City Planning and Zoning Zoning maps divide land into categories like low-density residential, general commercial, industrial, and mixed-use, each with its own rules about what can be built and how buildings can be occupied.
Before occupying any building, the intended use has to match the property’s zoning. A daycare in a residential zone typically needs a conditional use permit, which involves a public hearing and municipal approval. Variances exist for genuine hardship from setbacks, height, or lot coverage rules, but they aren’t a workaround for ignoring zoning.
Running a Business from Home
Home occupations are permitted in Oregon but come with real constraints. Under ORS 215.448, counties can allow home occupations in any zone, including farm and forest zones, subject to conditions.11OregonLaws. ORS 215.448 – Home Occupations In agricultural and forest zones, the business must be operated by a resident of the property, employ no more than five people on-site, operate substantially within the dwelling or existing outbuildings, and not unreasonably interfere with neighboring uses. Cities impose their own home occupation standards, which often add restrictions on signage, client visits, and commercial vehicle parking. A home occupation cannot be used to justify rezoning the property.
Short-Term Rentals
Short-term rentals like Airbnb listings are regulated at the local level, and rules vary sharply between cities. Common requirements include a land use permit, an operating license, fire safety inspections, proof of neighbor notification, and collection of local transient room taxes. Some cities also impose separation distances between whole-house rentals to prevent clustering in residential neighborhoods. Check your city or county’s specific permit requirements before listing a property; operating without proper permits can result in fines and forced delisting.
Rent Caps, Habitability, and Repair Rights
Oregon’s Residential Landlord and Tenant Act provides some of the strongest tenant protections in the country, extending well beyond basic habitability into rent increases, lease terms, and repair rights.
Written Leases and Rent Increases
Oregon does not require landlords to provide a written rental agreement for standard residential tenancies. Oral agreements are legally valid for month-to-month arrangements.12OregonLaws. ORS 90.220 – Terms and Conditions of Rental Agreement The exception is manufactured dwelling parks and floating home marinas, where ORS 90.510 requires a written rental agreement signed by both parties.13Oregon State Legislature. Oregon Revised Statute Chapter 90 – Residential Landlord and Tenant – Section 90.510 A written lease is still strongly advisable for any tenancy, since rent, occupancy limits, and other terms become very hard to prove in court without documentation.
Oregon caps most annual rent increases. Under ORS 90.323, landlords cannot raise rent by more than 7% plus the consumer price index, with an absolute ceiling of 10%. For 2026, the maximum allowable increase is 9.5%.14Oregon.gov. 2026 Rent Stabilization Percentages Two categories of housing are exempt: units whose first certificate of occupancy was issued less than 15 years before the rent increase notice, and government-regulated affordable housing where the change is driven by program requirements or tenant income.15OregonLaws. ORS 90.323 – Maximum Rent Increase
Habitability and Repairs
Landlords must keep every rental unit in habitable condition throughout the tenancy. ORS 90.320 requires working plumbing, heating, and electricity, along with effective weatherproofing of the roof, exterior walls, windows, and doors. The building and grounds must be safe, sanitary, and free of pest infestations.16Oregon State Legislature. Oregon Revised Statute Chapter 90 – Residential Landlord and Tenant – Section 90.320
Tenants have two main statutory remedies when a landlord doesn’t maintain those conditions. Under ORS 90.360, a tenant can deliver a written notice describing the problem and stating that the lease will terminate if it isn’t fixed, within 7 days for essential services like heat and water, or 30 days for other habitability problems.17OregonLaws. ORS 90.360 – Effect of Landlord Noncompliance With Rental Agreement If the landlord doesn’t act, the tenant can end the lease, seek damages for reduced rental value, or pursue substitute housing.
For smaller problems, ORS 90.368 provides a repair-and-deduct remedy. If a minor defect (a leaky faucet, a broken light switch, a clogged toilet) can be fixed for $300 or less, the tenant can give seven days’ written notice and then hire someone to make the repair if the landlord doesn’t. The cost comes out of the next month’s rent.18Oregon State Legislature. Oregon Revised Statute Chapter 90 – Residential Landlord and Tenant – Section 90.368 The tenant cannot do the work personally; the repair must be performed by a third party. This remedy also doesn’t cover mold, radon, asbestos, or lead-based paint, which require more specialized intervention.
Commercial Occupancy Sits Outside These Protections
Commercial tenants in Oregon operate under a different framework. The Residential Landlord and Tenant Act does not apply to commercial leases, so there are no statutory habitability standards, no rent caps, and no repair-and-deduct rights. Nearly everything depends on what the lease says.
One overlay applies regardless of the lease: ADA compliance. Under federal law, both the landlord and the tenant are legally responsible for accessibility in places of public accommodation. A lease can assign who physically makes the changes and pays for them, but that internal allocation doesn’t eliminate either party’s obligation to the public. If your business is open to customers, ADA compliance is your problem no matter what the lease says about renovations.
Penalties for Violations
Oregon enforces occupancy and building code violations through a layered system of fines, corrective orders, and tenant remedies. The consequences scale with the severity and persistence of the violation.
Under ORS Chapter 455, the Department of Consumer and Business Services can impose civil penalties of up to $5,000 per offense for building code violations, or up to $1,000 per day for ongoing violations. The maximum per-offense penalty requires a finding that the violator has engaged in a pattern of violations.19Oregon State Legislature. Oregon Revised Statute Chapter 455 – Building Code For manufactured dwelling violations, the ceiling jumps to $1 million for related violations occurring within a single year. Where a violator profited from the illegal activity, the state can pursue a penalty of up to five times the profit earned.
Local building departments and code enforcement officers can also issue citations independently, order corrective action, and, when a violation poses an immediate safety risk, order the building vacated until it comes into compliance.
Landlords who fail to maintain habitable conditions also face direct exposure to their tenants. Beyond the lease termination and repair-and-deduct remedies, tenants can sue for damages reflecting the reduced value of the unit during the period it was uninhabitable.17OregonLaws. ORS 90.360 – Effect of Landlord Noncompliance With Rental Agreement If a landlord knowingly rents a unit that doesn’t meet legal occupancy standards, a damages claim becomes much stronger. Tenants facing eviction can also file a counterclaim for habitability violations, effectively turning the landlord’s case against them. Some Oregon cities add another layer: Portland, for example, requires landlords to register rental properties, and failure to register can result in substantial fines on top of state penalties.