Oregon Building Codes, Permits and Contractor Rules
Here’s every rule from our 50-state guides for Oregon on one page: the residential building code, frost depth, retaining wall permits, the 811 dig law, drainage law, contractor licensing, deposit limits, mechanics lien deadlines, workers’ comp, planting zones and frost dates. Each section links the official source and the full 50-state comparison.
Oregon at a glance
- Building code: 2024 IRC (statewide)
- Frost depth: Set locally; often 12-18 in.
- 811 notice: At least 2 but not more than 10 full business days before excavation
- Contractors: State license required
- Deposits: No statewide cap
- Liens: 75 days from last furnishing
- Workers’ comp: 1+ employees
- Drainage rule: Civil law (natural flow)
- Planting zones: 5a to 10a
| Topic | Oregon | Compare |
|---|---|---|
| Residential building code | 2024 IRC (statewide) | All states |
| Frost line depth | Set locally; often 12-18 in. | All states |
| Retaining wall permit | No fixed statewide height. Statewide, a permit is required for retaining walls that provide safeguards for building users, support a regulated building, or… | All states |
| 811 notice before digging | At least 2 but not more than 10 full business days before excavation | All states |
| Contractor license | State license required | All states |
| Deposit limit | No statewide cap | All states |
| Right to cancel | 3 business days, sales made at home | All states |
| Lien filing deadline | 75 days from last furnishing | All states |
| Workers’ comp required | 1+ employees | All states |
| Drainage between neighbors | Civil law (natural flow) | All states |
| Planting zones (2023 USDA) | 5a to 10a | All states |
| Frost dates (NOAA) | Last frost late Feb (North Bend) to mid-Jun (Burns); first frost early Sep (Burns) to early Dec (North Bend) | All states |
Oregon residential building code
- Code
- 2026 Oregon Residential Specialty Code (based on the 2024 International Residential Code)
- How it applies
- Statewide, mandatory everywhere
- In effect since
- October 1, 2026
- Code agency
- Oregon Department of Consumer and Business Services, Building Codes Division
- Who enforces it
- Chapter 1 is mandatory from October 1, 2026; for Chapters 2-44 the 2023 code may still be used until the 2026 code becomes mandatory April 1, 2027. Local governments cannot add building requirements beyond the state code, except for a few items such as some fences and retaining walls.
- Good to know
- Oregon's 2026 residential code, based on the 2024 IRC, took effect October 1, 2026. Until April 1, 2027, builders may still design to the 2023 code for most chapters.
Compare building codes in all 50 states
Frost line depth in Oregon
- Who sets it
- Local building department
- Local examples
- Josephine County: 12 in. below 2,500 ft elevation; 18 in. above
Deschutes County: 18 in. minimum - Typical range
- 12-18 in. in the counties listed
- Good to know
- Oregon's Building Codes Division gives a site-specific frost line depth for residential projects through its online Design Criteria Hub.
Frost line depth in every state
Retaining wall permits in Oregon
- Permit exemption
- No fixed statewide height. Statewide, a permit is required for retaining walls that provide safeguards for building users, support a regulated building, or retain material that could impact a regulated building if not restrained. Cities and counties may require permits for other walls by ordinance, but not for walls 4 ft or less (bottom of footing to top of wall) unless they support an ascending slope steeper than 3:1 or a nonsoil surcharge; a higher local threshold is allowed (2026 ORSC R101.2.2 item 2).
- Engineer required
- ORSC R404.4: walls not braced at the top that retain more than 48 in. of unbalanced fill, or walls over 24 in. that resist other lateral loads, must be designed to accepted engineering practice with a 1.5 safety factor against sliding and overturning.
- Who decides
- Your city or county building department (or the state BCD where it serves as building official) decides.
- Good to know
- Oregon's 2026 code took effect Oct. 1, 2026. Whether you need a permit depends on what the wall supports or protects, not just its height.
Retaining wall permit rules in every state
811 dig law in Oregon
- One-call center
- Oregon Utility Notification Center (Dig Safely Oregon)
- Notice before digging
- At least 2 but not more than 10 full business days before excavation
- Ticket good for
- 45 calendar days after notice; the center advises not using marks after 30 days
- Hand-dig zone
- 24 in. surrounding the outside dimensions of all sides of the facility
- Homeowners
- Partial exemption: an owner or tenant digging on their own private property less than 12 in. deep, outside any established easement, need not notify (no tool restriction). Agricultural tilling on private property outside utility easements is also excluded. Deeper digging requires a call.
- The law
- ORS 757.557 and related sections of ORS ch. 757; OAR ch. 952
- Good to know
- The Oregon Utility Notification Center advises against using marks older than 30 days, even though the ticket runs 45 calendar days.
Drainage law and stormwater permits in Oregon
- Rule
- Civil law (natural flow)
- The rule
- Civil law rule as modified in Oregon: an upper owner may drain surface water onto lower land in the quantities and places it would naturally drain, even through artificial drains that speed up the flow, with due regard for the lower owner; but may not divert water from its natural channels or concentrate it and discharge it where it otherwise would not have flowed.
- Leading case
- Garbarino v. Van Cleave (as applied in Gibson v. Morris). Garbarino v. Van Cleave, 214 Or 554, 330 P.2d 28 (1958); Rehfuss v. Weeks, 93 Or 25, 182 P 137 (1919); Gibson v. Morris, Or. Ct. App. No. A152724 (Apr. 29, 2015)
- What it means for your yard
- Water that naturally drains onto your downhill neighbor can keep doing so, even if your drains speed it up, but you can't divert it out of its natural path or collect it and send it onto their land at a new spot, and you must have due regard for their property.
- Construction stormwater permit
- Oregon Department of Environmental Quality (DEQ); some cities and agencies act as DEQ agents or cover small lots through local codes (1200-CN): 1 acre or more, including off-site support activities, or less than 1 acre if part of a common plan that will ultimately disturb 1 acre or more: NPDES 1200-C (effective Dec. 15, 2025 to Dec. 14, 2030)
- State rules below 1 acre
- No statewide rule below the 1-acre permit found; check your county and town.
- Local rules
- Oregon cities and counties often require erosion control permits for much smaller projects.
- Good to know
- Oregon lets natural drainage continue onto lower land, even if drains speed it up, but bars diverting or concentrating water onto a neighbor at a spot where it wouldn't naturally go. State construction stormwater permits start at 1 acre, and many cities regulate smaller jobs.
Contractor licensing in Oregon
- Statewide rule
- License
- Agency
- Oregon Construction Contractors Board (CCB)
- Who needs it
- Anyone working for compensation on improvements to real property, including handymen, must hold a CCB license with the proper residential or commercial endorsement.
- When it applies
- Any amount (no dollar exemption stated)
- Check a contractor
- Official lookup
- Good to know
- Only a few activities, such as gutter cleaning, pressure washing and debris cleanup, are listed as not needing a license.
Contractor license requirements in every state
Contractor deposits and your right to cancel in Oregon
- Deposit limit
- No statewide cap.
- Right to cancel
- Home solicitation sales (personally solicited, including after the buyer invites contact, and agreed to away from the seller's place of business; cash sales under $25 excluded): may cancel until midnight of the third business day after signing, not counting Saturdays, Sundays or holidays (ORS 83.710, 83.720).
- Written contract
- Required for residential work over $2,000 (ORS 701.305). Must include the contractor's name, address, phone and CCB license number, the customer's name and address, the jobsite address, a description of work, price and payment information, the owner's dispute-resolution and CCB complaint rights, and whether there is a mediation or arbitration clause (Construction Contractors Board residential contract checklist).
- Other protections
- Contractors must be licensed, bonded and insured with the Construction Contractors Board (per Oregon DOJ).
- The law
- ORS 701.305, 701.315 (residential contracts); ORS 83.710–83.750 (home solicitation sales)
- Good to know
- Oregon requires a written contract for residential work over $2,000 and the contractor's CCB license number must be on it, which makes it easy to look up the license before you pay.
Contractor deposit limits in every state
Mechanics lien deadlines in Oregon
- Lien deadline (prime)
- File the claim of lien within 75 days after the claimant stops furnishing labor, materials or equipment, or 75 days after completion of construction, whichever is earlier; mail notice of filing to the owner and mortgagee within 20 days after filing (ORS 87.035, 87.039).
- Lien deadline (sub/supplier)
- Same as prime.
- Preliminary notice (sub/supplier)
- Required (except commercial improvements): notice of right to a lien to the owner; it protects only work furnished on or after 8 days (excluding weekends and holidays) before it is delivered or mailed (ORS 87.021). Subs who dealt with an unlicensed contractor can't lien an existing owner-occupied home they renovated (ORS 87.036).
- Notice of intent
- No notice before filing. Notice of intent to foreclose to the owner and mortgagee at least 10 days before suit (ORS 87.057); missing it bars fees and costs.
- Enforce within
- Suit within 120 days after the claim is filed; a payment extension stated in the claim can delay this, but not beyond 2 years from filing (ORS 87.055).
- Homeowner rules
- Contractors must give homeowners the CCB Information Notice to Owner on contracts over $2,000 or lose lien rights (ORS 87.093). No lien arises for services to an owner-occupied residence requested by the owner's agent (ORS 87.021).
- The law
- ORS Ch. 87, §§ 87.001-87.093 (Construction Liens)
- Good to know
- Oregon contractors lose lien rights on a home job over $2,000 if they don't hand the owner the state's Information Notice to Owner About Construction Liens, and liens must be filed within 75 days.
Mechanics lien deadlines in every state
Workers' comp requirements in Oregon
- Who must carry it
- Almost all employers with workers in Oregon must carry coverage; a worker is anyone paid to work who isn't an independent contractor (ORS Ch. 656; Oregon WCD). Casual labor under a set 30-day payroll amount is exempt. Construction and landscape businesses registered with the CCB or LCB as having no workers can't hire even casual labor.
- Owners and officers
- Exempt: real partners and most LLC members (in construction and landscaping, they need a substantial ownership interest); corporate officers who are directors and own at least 10% of stock (or the average). Construction and landscape firms are generally capped at two exempt officers/members, or one per 10 employees, unless all are family. Owners working under contract must also qualify as independent contractors (Oregon WCD guide; ORS 656.027).
- Subcontractors
- A person who awards a contract for labor that is a normal and customary part of its own trade or business is responsible for comp coverage for the contract's workers unless the contractor provides it before labor begins; otherwise injured workers are paid as if the hirer were a noncomplying employer (ORS 656.029). This does not apply when the hirer holds a CCB or LCB license required for the work (ORS 656.021), but prime contractors must still confirm subs are covered (Oregon WCD guide).
- Homeowners
- Workers doing gardening, maintenance, repair, remodeling or similar work in or about the employer's private home are nonsubject workers (ORS 656.027(2)), and ORS 656.029 only reaches work that is part of the hirer's trade or business.
- Penalties
- First offense: twice the premium owed, minimum $1,000; continued noncompliance up to $250 per day with no cap; WCD seeks a permanent injunction; noncomplying employers pay full claim costs plus a fee; officers, directors and LLC members/managers can be personally liable (Oregon WCD guide).
- The law
- ORS Chapter 656; ORS 656.017, 656.027, 656.029
- State agency
- Oregon Department of Consumer and Business Services, Workers' Compensation Division (WCD)
- Good to know
- Oregon requires coverage for nearly every worker. Construction and landscape firms registered as having no workers can't hire even casual help, and homeowners hiring remodeling work on their own home aren't treated as the crew's employer.
Workers' comp requirements in every state
Planting zones in Oregon
- 2023 USDA zones
- 5a to 10a
- Coldest-night range
- −20°F to 35°F
- Example cities
- Portland: 9a, Eugene: 8b, Bend: 6b, Medford: 8b
- Local plant advice
- Oregon State University
- Good to know
- Oregon's zones swing widely, from the mild west side, where Portland is 9a, to the high desert east of the Cascades, where Bend is 6b.
Frost dates in Oregon
| Station | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Portland Willamette Valley, north | March 13 | November 19 | 247 |
| Medford Rogue Valley, southwest | April 8 | October 29 | 204 |
| North Bend Southern coast | February 21 | December 9 | 294 |
| Burns High desert, southeast | June 11 | September 6 | 85 |
- Typical range
- Last frost late Feb (North Bend) to mid-Jun (Burns); first frost early Sep (Burns) to early Dec (North Bend)
- Good to know
- These are typical (50%) dates from NOAA's 1991–2020 climate normals, so about half of years still bring a 32°F night after the listed spring date. In Oregon, the last spring frost at the stations listed ranges from late February around North Bend to mid-June around Burns.
- Local frost or planting guide
- Oregon State University Extension Service
Frequently Asked Questions
What building code does Oregon use?
2026 Oregon Residential Specialty Code (based on the 2024 International Residential Code). It applies as follows: statewide, mandatory everywhere. Your local building department can confirm the edition and amendments for your address.
How deep is the frost line in Oregon?
Frost depth is set by local building departments. Typical local values: 12-18 in. in the counties listed. Footings for houses, additions and attached decks go below it.
How much can a contractor ask for up front in Oregon?
No statewide cap. Cancel rights: Home solicitation sales (personally solicited, including after the buyer invites contact, and agreed to away from the seller’s place of business; cash sales under $25 excluded): may cancel until midnight of the third business day after signing, not counting Saturdays, Sundays or holidays (ORS 83.710, 83.720).
How long does a contractor have to file a mechanics lien in Oregon?
File the claim of lien within 75 days after the claimant stops furnishing labor, materials or equipment, or 75 days after completion of construction, whichever is earlier; mail notice of filing to the owner and mortgagee within 20 days after filing (ORS 87.035, 87.039). Subcontractors and suppliers may have different notice rules; see the section above.
What planting zone is Oregon?
On the 2023 USDA map, Oregon runs from zone 5a to 10a. Examples: Portland 9a, Eugene 8b, Bend 6b. Enter your ZIP on the USDA map for your exact zone.
Do contractors need workers' comp in Oregon?
Almost all employers with workers in Oregon must carry coverage; a worker is anyone paid to work who isn’t an independent contractor (ORS Ch. 656; Oregon WCD). Casual labor under a set 30-day payroll amount is exempt. Construction and landscape businesses registered with the CCB or LCB as having no workers can’t hire even casual labor. Owner exemptions and subcontractor rules are in the workers’ comp section above.
When is the last frost in Oregon?
At the NOAA stations we list: Last frost late Feb (North Bend) to mid-Jun (Burns); first frost early Sep (Burns) to early Dec (North Bend). These are typical (50%) dates from the 1991–2020 climate normals, so about half of years still bring a 32°F night after the spring date.
This page is general information, not legal or tax advice. Rules change; the agencies and statutes linked above have the final word.
Oregon in each 50-state guide: Frost line depth · 811 dig laws · Retaining wall permits · Contractor licensing · Contractor deposit limits · Building codes · Planting zones · Mechanics lien deadlines · Workers' comp · Frost dates · Drainage laws · Noxious weed laws · Rainfall and snowfall · Landscaper pay · Pesticide applicator licensing · Landscaping sales tax · All state guides
Last checked October 31 and November 1, 2026 against official state and local sources for this state. Rules change; your state agency or local building department has the final word. Spot something out of date? Email info@muthlerlandscaping.com and we’ll fix it.
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Cite as: Muthler Landscaping & Construction, “Oregon Building Codes, Permits and Contractor Rules,” https://muthlerlandscaping.com/state-guides/oregon/ (last checked November 9, 2026).
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