Multnomah County is the most populous county in Oregon at about eight hundred thousand residents, but it is also the smallest by area and the most heavily incorporated — most of its population lives inside Portland, Gresham and the smaller east-county cities, each of which runs its own permitting. The county’s own building and land-use role is concentrated in its relatively small unincorporated areas.
This guide covers the uniform statewide code, the county’s limited unincorporated footprint, land use for unincorporated parcels, and where city-limit work goes instead.
This guide covers unincorporated Multnomah County. Portland, Gresham, Troutdale, Fairview and Wood Village run their own permitting.
Multnomah County is unusual: a huge population but a small unincorporated area, so most ‘Multnomah County’ projects are really city projects. The first step is confirming whether a parcel is inside Portland, Gresham or another city — each runs its own counter — or in genuinely unincorporated county land, where the county administers land use and building.
What requires a building permit in Multnomah County?
Oregon runs a single, uniform building code statewide — the Oregon Specialty Codes, administered by the Building Codes Division of the Department of Consumer and Business Services. The code is the same in every jurisdiction; what varies is who administers it and the local land-use approvals layered on top. So in Multnomah County, the technical requirements come from the state code, while the county handles the permit, the inspections and the zoning and land-use side.
Permit required
- New residential and commercial construction, additions, alterations and conversions
- Structural and load-bearing work, foundations, decks over the exempt height, and retaining walls above the code threshold
- Finishing basements and attics, garage conversions and any change of use or occupancy
- Electrical work under the Oregon Electrical Specialty Code, including services, circuits, solar and EV charging
- Plumbing under the Oregon Plumbing Specialty Code, and mechanical work under the mechanical code
- Re-roofing above the exempt scope, siding, most window changes, pools, signs and demolition
Typically exempt
- Painting, papering, tiling, carpeting, cabinets and similar finish work
- One-story detached accessory structures below the code floor-area exemption
- Wood, wire-mesh and chain-link fences, exempt by statewide code
- Minor repairs replacing materials in kind, and like-for-like fixture swaps
Because the exemptions are written into the statewide code, they are consistent across Oregon — but an exemption from a building permit is never an exemption from zoning, land use, floodplain rules or an electrical or plumbing permit. Confirm scope with the county before work starts rather than after.
Which code applies — OSSC or ORSC
The Oregon Residential Specialty Code (ORSC) governs one- and two-family dwellings and townhouses and their accessory structures; the Oregon Structural Specialty Code (OSSC) governs commercial buildings, apartments of three or more units and everything outside the residential scope. Alongside them sit the mechanical, plumbing, electrical, energy and fire specialty codes. In Multnomah County, the county administers the state code and land use for unincorporated parcels; work inside the cities is administered by those cities.
Two design factors reach nearly every Oregon project. Seismic design under the Cascadia Subduction Zone affects foundations, connections and lateral bracing across much of the state, with site-specific values available through the state Design Criteria Hub. And Oregon’s statewide land-use system means a building permit sits downstream of zoning and land-use compatibility — the land-use question is settled first.
Who handles permitting in Multnomah County?
The county handles land use and building for unincorporated Multnomah County; Portland, Gresham and the east-county cities handle their own permitting.
| Detail | Information |
|---|---|
| Authority | Multnomah County (unincorporated land use and building) |
| Seat | Portland |
| Serves | Unincorporated Multnomah County only |
| Cities | Portland, Gresham, Troutdale, Fairview, Wood Village |
| Code | Oregon Specialty Codes (uniform statewide) |
| Seismic | Cascadia design via the state Design Criteria Hub |
| Contractor credentials | CCB licence required regardless of value |
| City-limit work | Handled by the incorporated city, not the county |
Because so much of Multnomah County is incorporated, confirm the jurisdiction from the parcel first — a project in Portland files with Portland Permitting and Development, one in Gresham with the City of Gresham, and only genuinely unincorporated ground is a county matter. On unincorporated parcels the county handles the land-use question ahead of the building permit.
The technical code is the same statewide, so what the county sets is the local administration, the fee schedule and the land-use requirements — not the code text.
Permit types
Residential permits
Unincorporated residential work spans west-hills, Sauvie Island and east-county parcels, where land use, floodplain and seismic design come first. Re-roofs, solar and EV chargers need permits, and every contractor must hold a current CCB licence regardless of the size of the job.
How Oregon contractor licensing works
Oregon licensing runs through the Construction Contractors Board (CCB), and its defining feature is that it has no dollar threshold: general contractors, specialty contractors and subcontractors must all hold a current CCB licence to bid or perform construction, regardless of the size or value of the job. This is the opposite of the value-triggered systems in many states.
In Oregon, the licensing question is answered before you look at the project value, not after. Almost any construction for pay requires a CCB licence, so the check is simply whether the contractor holds a current one in the right structure. A narrow exemption lets homeowners do certain work on their own primary residence, but a homeowner who hires out the work is expected to use CCB-licensed contractors.
Commercial permits
Commercial work concentrates in the cities; unincorporated commercial work is a county land-use and building matter. Every contracting business on it must hold a CCB licence, with electrical and plumbing tied to state-licensed installers.
Credentials: CCB plus state trade licensing
Beyond the CCB licence, the trades are licensed by the state: electricians and electrical contractors under the Oregon Electrical Specialty Code, and plumbers under the plumbing code, both administered through the Building Codes Division. So an electrical or plumbing permit is tied to a state-licensed installer, not just a CCB registration. Confirm the CCB licence and the relevant trade licence before filing rather than after the first correction notice.
Multnomah County permit costs and fees
Budget the county building permit and plan-review fees, the statewide surcharge, separate trade permits, and any land-use review. Fees follow Oregon’s statewide valuation method but the schedule is set by the county.
| Fee component | How it works |
|---|---|
| Building permit | Based on Oregon’s statewide valuation method; the schedule is set locally |
| Plan review | A percentage of the building permit fee, charged at submittal |
| Trade permits | Separate electrical, plumbing and mechanical fees |
| State surcharge | A statewide percentage surcharge added to permit fees |
| Land-use review | Zoning, design or land-use review where the project triggers it |
| Re-inspections and revisions | Additional fees for failed inspections, revisions and expired permits |
Oregon uses statewide valuation methods to calculate building-permit fees, but the schedules and the plan-review percentages are set by each jurisdiction, and a statewide surcharge is added on top. A figure quoted from a neighbouring city or an older packet is not a reliable number, so ask the county for the schedule in force on your filing date, and ask separately about plan review, trade permits, the state surcharge and any land-use review fees.
Need a real number for a specific Multnomah County project? Send us the scope, address and valuation and we will identify the filing path, the reviews it will trigger and the fee categories that will apply.
Trade permits and who may pull them
Trade permits are separate from the building permit and are issued to the state-licensed installer. Because Oregon licenses electricians and plumbers at the state level and requires a CCB licence for the contracting business, the credential check has two parts on almost every project: the CCB licence and the relevant trade licence. Confirm both before filing.
Oregon’s trade licensing is a state system, so it is consistent across jurisdictions. An electrical permit is tied to a state-licensed electrical contractor and a plumbing permit to a state-licensed plumbing contractor, wherever the project is. What varies locally is the counter that issues the permit and the inspection schedule, not the licence itself.
- Electrical work is permitted under the Oregon Electrical Specialty Code and tied to a state-licensed electrical contractor.
- Plumbing work is permitted under the plumbing code and tied to a state-licensed plumbing contractor.
- Mechanical work is permitted under the mechanical code; the CCB licence still applies to the business.
Permit required
- Service installations, panel upgrades, new circuits, solar PV and EV chargers
- New plumbing, repipes, water heater change-outs, fixtures, backflow and gas piping
- HVAC installation and change-out, ductwork, venting and commercial kitchen exhaust
- Sprinkler, standpipe and fire alarm work on commercial and multi-family structures
Typically exempt
- Replacing a fixture, switch, receptacle or light with no alteration to wiring or piping
- Clearing a stoppage without replacing or rearranging concealed piping
- Filter, thermostat and routine component service
- Like-for-like appliance repair that does not alter the connection
How to apply for a Multnomah County building permit
Portland, Gresham and the east-county cities file with their own counters.
On unincorporated parcels the county reviews land use before the building permit.
Cascadia design reaches most of the county.
Oregon requires it regardless of project value.
Trade permits are tied to state-licensed installers.
Confirm the sets and forms the office needs.
Review, corrections and what actually causes delay
In Oregon, delay tends to come from the land-use and site side rather than the code text, since the code itself is uniform statewide. The common causes are an unresolved zoning or land-use question, a seismic or site-design value that was not pulled from the Design Criteria Hub, a missing CCB or trade licence, or a submittal that did not match what the county needs. Settle the land-use question first, then file the building permit.
Approvals do not stay live indefinitely. An Oregon building permit carries a validity period and can expire if work does not start or stalls between inspections. On phased work or a project waiting on financing, confirm the expiry before it passes — reviving a lapsed permit is more work than keeping one active.
Inspections in Multnomah County
Standard checkpoints include footing and foundation, under-floor and slab, framing, rough-in electrical, plumbing and mechanical, insulation and energy, fire systems on commercial work, and final, with occupancy approval before use. Unincorporated hillside and floodplain parcels add site and drainage verification.
Many Oregon jurisdictions schedule inspections online or by interactive phone system, often through the state ePermitting platform; confirm the method the county uses and give the notice it asks for.
Do not cover work before the required inspection has been approved. Keep the issued permit, the approved plans, the seismic and energy documentation, product listings and your correction responses available on site.
Multnomah County permit search and official resources
Permit records in Oregon sit with the authority that issued them — where the county administers the code, it holds the building permit, the inspection history and the certificate of occupancy for work in unincorporated Multnomah County. Many jurisdictions expose permit search through the state ePermitting portal. If you are buying, refinancing or renovating, confirm that past work was permitted rather than assuming it was.
The code is statewide, but the counter is local. Fees, submittal lists, review turnaround and land-use requirements are set by the administering jurisdiction; the technical code is not. Confirm current requirements, fees and review turnaround for your filing date.
These are the primary sources behind this guide. Codes, fee schedules and portal procedures change — confirm the position for your filing date.
- Multnomah County Land Use Planning
- Oregon Building Codes Division
- Oregon Construction Contractors Board (CCB)
- Oregon ePermitting
- Oregon Local Building Department Directory
Frequently asked questions
Does Multnomah County issue permits for Portland?
No. Portland, Gresham and the other cities run their own permitting. The county handles only its unincorporated areas.
Why is the county’s building role so small?
Multnomah County is the smallest county by area and the most heavily incorporated, so most construction happens inside its cities.
Is the building code different from the cities?
No. Oregon runs one uniform code statewide; what differs is the administering office, the fee schedule and the land-use rules.
Do I need a contractor licence for a small county job?
Yes. Oregon requires a current CCB licence for construction regardless of project value; a narrow exemption covers homeowners on their own residence.
Does seismic design apply here?
Yes. Cascadia seismic design reaches most of the county; pull site-specific values from the state Design Criteria Hub.
How do I run a Multnomah County permit search?
Ask the administering authority — the relevant city for city work, the county for unincorporated; many use the state ePermitting portal.
Simplify Multnomah County permitting with Alliance Permitting
Multnomah County work turns on jurisdiction first — usually whether a parcel is inside Portland or Gresham — and then on land use and seismic for unincorporated parcels. Confirming those up front is most of the battle in Oregon’s densest county.
Trusted by leading builders, developers, and national contractors — 22 years of filing in the jurisdictions we write about.
Contractors and builders choose Alliance for Multnomah County because the work is done by people who have stood at the counter:
- We confirm city-versus-county jurisdiction from the parcel.
- We settle the land-use question before the building permit.
- We pull seismic and site values from the Design Criteria Hub.
- We verify every contractor holds a current CCB licence.
- We confirm state electrical and plumbing licences for the trades.
Alliance Permitting is a permit documentation and submission company in Oregon. We prepare your paperwork, file it correctly and coordinate with the permitting authority through issuance. We are not a contractor and we do not perform licensed plan review or inspections; that work stays with your licensed team and the jurisdiction.
Ready to break ground in Multnomah County sooner?
Let Alliance prepare, file, and track your Multnomah County permits while your crew stays on the job.
More Oregon permitting guides
This guide is provided by Alliance Permitting for general information about Multnomah County permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.