What Can You Build Without a Permit in Oregon? (2026)
The 30-second answer for Oregon
In Oregon, the projects you can usually build without a building permit are a small detached shed, a short freestanding deck, a fence under the height cap, a low retaining wall, and cosmetic interior work. The exact limits Oregon enforces are in the table below — and your city can be stricter than the state. The catch every homeowner needs to hear: even when no permit is required, the building code, zoning setbacks, and any HOA rules still apply. Permit-exempt means the paperwork is waived, not the rules.
How Oregon sets the rules
Oregon enforces a single statewide code, the 2023 Oregon Residential Specialty Code (ORSC), which is based on the 2021 International Residential Code with state amendments and became mandatory April 1, 2024. It is adopted and maintained by the Building Codes Division (BCD) within the Department of Consumer and Business Services. Under ORS 455.040 the code is uniform statewide, and municipalities may not impose different building requirements without state authorization.
Permit-exempt limits in Oregon
These are the thresholds we verified for Oregon. Treat each one as the most you can usually do without pulling a permit — a stricter city amendment always wins.
| Project | Oregon permit-exempt limit |
|---|---|
| Detached shed / accessory building | No building permit for a nonhabitable, one-story detached accessory structure with building area of 200 sq ft or less AND height of 15 ft or less, per ORSC R105.2. On parcels of 2.0 acres or more, up to 400 sq ft is exempt if set back at least 20 ft from property lines and other structures. A zoning permit may still be required. |
| Deck | Porches and decks are permit-exempt when the walking surface is not more than 30 inches above adjacent grade, measured at any point within 3 ft horizontally (ORSC R105.2). Oregon adds no 200 sq ft cap and does not disqualify attached decks, so only the 30-inch height governs. A zoning permit may still apply. |
| Fence | Under ORSC R105.2, no building permit for fences of wood/similar material up to 7 ft high, masonry/concrete up to 4 ft high, or typical field fencing (woven wire or chain link) up to 8 ft high. Required swimming pool barriers are never exempt. Local zoning often caps fence height lower (commonly 6 ft), so confirm with the city. |
| Retaining wall | No building permit for a retaining wall 4 ft or less measured from the bottom of the footing to the top of the wall (ORSC R105.2). The exemption is lost if the wall supports ascending backfill steeper than 3 horizontal to 1 vertical, or supports a nonsoil surcharge (such as a driveway or structure load above). |
| Patio (on grade) | Concrete sidewalks, slabs, platforms, and driveways not more than 30 inches above grade, not over a basement or story below, and not part of a required accessible route are permit-exempt (ORSC R105.2). Attached patio or porch covers of 200 sq ft or less are also exempt. Zoning setbacks still apply. |
Baseline: 2021 International Residential Code, Section R105.2. See the national project-by-project guide for how each threshold works.
Can you do the work yourself in Oregon?
Yes. Oregon's owner-builder exemption (ORS 701.010) lets a homeowner pull the permit and perform or directly supervise general construction on a residence they own and occupy, without a CCB contractor license. The applicant must sign the state Information Notice to Owner About Construction Responsibilities. Electrical, plumbing, and mechanical work still generally require licensed trades, and selling the home within 24 months can trigger disclosure and liability obligations.
What's different about Oregon
One building code statewide, no city amendments
ORS 455.040 makes the ORSC uniform in every Oregon jurisdiction; cities cannot adopt different building-permit requirements without state (DCBS) authorization. Permit-exemption thresholds are therefore identical in Portland, Salem and Eugene. Zoning and land-use rules, however, are local and do vary, so a permit-free project can still need a zoning permit.
Decks are exempt by height, not by size
Oregon keeps the simple rule that any deck 30 inches or less above grade is permit-exempt, with no 200 sq ft cap and even when attached to the house. This is more permissive than the 2021 IRC baseline, which also requires the deck to be under 200 sq ft, freestanding, and not serving the required exit.
Bigger sheds allowed on acreage
The standard permit-free accessory-structure limit is 200 sq ft, but on parcels of 2.0 acres or more the ORSC exempts nonhabitable accessory structures up to 400 sq ft when set back at least 20 ft from property lines and other structures.
"Permit-exempt" does not mean rule-free
I spent 25 years as a firefighter before I built PermitDeck, so let me be blunt about the part that gets people hurt. "No permit" never means "no rules." When a project is exempt in Oregon, three things are still true — and now you are the one responsible for them, because no inspector is coming to check:
- Building code still applies. An exempt deck in Oregon still has to meet the structural rules of IRC R507 — real footings, a proper ledger, and guards. A shed still has to carry your local snow and wind load. The code does not care whether a permit was pulled.
- Zoning and setbacks still apply. Exempt does not mean you can put it anywhere. Setbacks from property lines, easements, lot-coverage caps, and corner-lot sight lines all still bind you — and a neighbor complaint can force you to move it.
- HOA rules are separate. Your HOA architectural review is a private contract, not a government permit. You can be fully permit-exempt with your city and still be forced by your HOA to tear something out.
The big Oregon cities
Permits are pulled locally, so your city's building department has the final word. Here are the two largest, with a link straight to their office.
Portland
Portland Permitting & Development Brochure 3 lists permit-free fences, decks, retaining walls and patios, and the garage/shed page confirms the 200 sq ft / 15 ft shed exemption. A separate zoning permit is often still required, especially in overlay zones and plan districts.
Portland building departmentEugene
Eugene's official No Building Permit Required handout (Form RB-428) lists the ORSC exemptions. Note Eugene's local admin rule treats fences up to 9 ft (materials 5 psf or less) or 6 ft (heavier) as permit-exempt, more generous than the statewide 7 ft figure; verify height limits with Land Use.
Eugene building departmentTurns out you do need a permit? We'll match you with pros who pull it
If your project crosses one of these Oregonthresholds, the cleanest path is to hire a licensed pro who pulls the permit in their own name and stands behind the inspection. Tell us the project once and we'll send it to up to three verified local pros. It's free, it's capped at three, and we never sell your information — the opposite of the lead-farm sites.
Get matched with up to 3 verified pros
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What happens if you needed a permit and skipped it
Guessing wrong on the exemption is not a small risk. The common outcomes are a stop-work order, a fine (often double the normal permit fee), and being ordered to open finished work back up for inspection or tear it out. The expensive part usually lands later: unpermitted work routinely kills a home saleat the buyer's inspection, and an insurance claim can be denied if the damage traces back to unpermitted construction. Most jurisdictions do allow a retroactive (after-the-fact) permit — it costs more, but it clears the record.
Full detail: what happens if you build without a permit and how to get a building permit.
Oregon permit-exemption FAQs
Do I need a permit to build a shed in Oregon?
No building permit is required for a nonhabitable, one-story detached shed of 200 square feet or less that is under 15 feet tall, under Oregon Residential Specialty Code R105.2. On rural parcels of 2 acres or more, the limit rises to 400 square feet if set back at least 20 feet. Zoning and setback rules still apply.
Are Oregon's permit rules the same in every city?
Yes. Oregon has one statewide building code, the ORSC, and ORS 455.040 bars cities from adopting different building requirements without state approval, so permit-exemption thresholds are identical in Portland, Salem, Eugene and everywhere else. However, zoning, setback, height, and land-use rules are local and vary widely, so always confirm those with your city before building.
Do I need a permit for a deck in Oregon?
A deck is exempt from an Oregon building permit only when its walking surface sits no more than 30 inches above grade, measured within 3 feet horizontally. Unlike the base IRC, Oregon sets no square-footage cap and allows attached decks, so size alone does not trigger a permit. A zoning permit may still be required by your city.
Can I pull my own building permit as an Oregon homeowner?
Yes. Oregon's owner-builder exemption lets you pull the permit and do the work yourself on a home you own and occupy without a CCB contractor license. You must sign the state Information Notice to Owner About Construction Responsibilities. Electrical, plumbing, and mechanical work still generally require licensed trades, and selling within 24 months can create disclosure and liability issues.
Sources we verified against
- Oregon Residential Specialty Code R105.2, Work exempt from permit
- Oregon Building Codes Division, Residential Structures Code Program (2023 ORSC edition)
- ORS 455.040, State building code preempts local ordinances
- City of Portland PPD Brochure 3, Fences, Decks and Outdoor Residential Projects
- ORS 701.010, Exemptions from CCB licensure (owner-builder)
Every threshold on this page is anchored to Oregon's building code or the sources listed above. Where a number varies by city and we could not verify it, we say "verify locally" rather than guess — a permit page you cannot trust is worse than no page at all.
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