Oregon, Multnomah Remodeler Permit Regulations and County Ordinances for Unincorporated Areas

Oregon and Multnomah County Remodeling and Renovation Permit Requirements

In Multnomah County, Oregon, the Building Codes Division is the Authority Having Jurisdiction (AHJ) for building permits. This division is responsible for ensuring that all construction and renovation projects comply with state and local building codes for safety and structural integrity.

Unincorporated Areas

Properties located in unincorporated areas of Multnomah County are subject to the same permit requirements as those within incorporated cities. The Multnomah County Building Codes Division oversees these areas, enforcing all applicable building codes and permit processes.

Demolition Work

Demolition work during a remodel often triggers the need for a permit. Specifically, if the demolition involves the removal of any structural elements, load-bearing walls, or if it's a complete demolition of a structure, a permit will likely be required. It's advisable to consult with the Building Codes Division to determine the exact scope of demolition that necessitates a permit, as partial demolitions may also require review.

Converting Non-Living Spaces

Converting non-living spaces such as garages, attics, or unfinished basements into habitable living areas is considered a significant change in occupancy and use, and therefore requires a building permit. This process typically involves:

Submitting detailed plans showing proposed changes, including structural, electrical, plumbing, and mechanical work.
Ensuring the converted space meets current building code requirements for egress, ventilation, insulation, fire safety, and ceiling height.
Obtaining necessary inspections throughout the construction process.

A "habitable space" is generally defined as a space within a building intended for human occupancy, which includes areas for living, sleeping, eating, or cooking, and which is equipped with the necessary utilities and amenities.

Resources to Learn More

Note: The following state-wide building codes and regulations apply universally to all jurisdictions within Oregon, including Multnomah.

Oregon Remodeler Legislation, Codes, and Guidelines

Oregon Building Codes for Remodelers and Residential Renovations

In Oregon, the Department of Consumer and Business Services (DCBS), through its Building Codes Division, is responsible for adopting, administering, and enforcing a uniform, statewide building code. This code governs construction and ensures minimum safety standards across the state. Many cities and counties administer and enforce these codes locally.

The state building code is comprised of various specialty codes. For existing buildings and renovations, the primary code is the 2021 Oregon Existing Building Code, which is based on the 2018 International Existing Building Code (IEBC) with Oregon-specific amendments. Other relevant codes include the Oregon Residential Specialty Code (ORSC) and the Oregon Structural Specialty Code (OSSC).

Generally, permits and plan review are required for remodels that involve structural changes, the creation of habitable space, alterations to openings, or modifications to electrical, plumbing, or mechanical systems. Cosmetic work, such as painting, replacing cabinets, or installing new flooring, is typically exempt from permits, provided it does not affect the structure or systems. However, even exempt work must comply with local zoning and code requirements.

Converting attics or basements into habitable living spaces is considered a structural alteration and will require permits and inspections.

Demolition guidelines vary by locality, but generally involve specific notification periods for property owners and may require deconstruction for older structures. For instance, some local ordinances may require a 15-day notice before demolition begins and specify procedures for debris removal and site restoration.

Recent legislative changes in 2024 and 2025 aim to streamline permitting processes for renovations. For example, municipalities over 15,000 in population may be prohibited from requiring frontage improvements as a condition for altering existing buildings, provided certain criteria are met regarding square footage, alteration cost, and occupancy classification.

Resources to Learn More

Select a City in Multnomah

If your project is located within incorporated city limits, you will likely need to follow municipal ordinances rather than county rules. Select your city below to view local regulations.

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