Reference

Oregon Crawl Space Requirements

What the state actually requires — of the work, of the contractor doing it, and of the homeowner paying for it — with the document that sets each rule named and linked. Written to be checkable rather than taken on trust, and useful whether or not you ever contact anyone through this site.

Sources drawn from 5 state and federal bodies · last checked between August 20, 2026 and October 7, 2026

The Oregon guides, in brief

  • Verifying an Oregon or Washington Contractor

    How to check a CCB or L&I licence in about two minutes, what the bond and insurance behind it actually cover, what the register will not tell you, and the deadlines that decide whether you have any recourse at all.

    • The two-minute check on the CCB register, and on L&I’s for Clark County, and the one step people skip: making sure the licensed business is the one named on the contract.
    • What "bonded and insured" actually buys: a bond that pays only after a judgment or arbitration award, and liability insurance that covers damage rather than disappointing work.
    • The complaint deadlines, including the 30-day certified-mail notice that makes the real deadline earlier than the stated one.

    Useful to Homeowners · Realtors · Property managers · Home inspectors

    7 primary sources: Oregon Construction Contractors Board, Washington State Department of Labor & Industries, State of Oregon

  • 2026 Oregon Crawl Space Code Changes

    A living tracker for the crawl space provisions of the 2026 Oregon Residential Specialty Code, in effect since October 1, 2026: what the board approved changing, the larger set of R408 requirements retained unaltered, the six-month phase-in, and the status of the edition as of the last check.

    • Where the 2026 Oregon Residential Specialty Code stands: adopted, in effect since October 1, 2026, with a six-month phase-in during which either edition may be used.
    • Which crawl space provisions the board approved changing: a mechanical-ventilation allowance in place of foundation vents, higher under-floor insulation values, and insulated access hatches.
    • The larger list recorded as retained unaltered, so a bid written to those requirements can be checked with confidence under either edition.

    Useful to Home inspectors · Realtors · Contractors · Homeowners · Journalists

    9 primary sources: Oregon Secretary of State, Oregon Administrative Rules Database, Oregon Building Codes Division

Oregon rules covered elsewhere on this site

Key rules at a glance

20 rules that bear on crawl space work in the Portland area, each in a sentence, with the document it comes from and the date that document was last opened and checked. The rule is the summary; the source is the authority, and where the two ever differ the source governs. Sources for this table last checked between August 20, 2026 and October 7, 2026.

The code

The code: Oregon and Washington rules with their sources
Topic The rule Written in
Edition in force 2026 code tracker → Two editions, until March 31, 2027. The 2026 Oregon Residential Specialty Code (ORSC) took effect October 1, 2026, and for six months building departments must accept plans designed to either it or the 2023 Oregon Residential Specialty Code (ORSC). The section numbers and quoted requirements on this site are from the 2023 edition; the tracker records what the 2026 edition changes, and each check of its status (last on October 2, 2026). OAR 918-480-0005 OAR 918-480-0005, Adopted Oregon Residential Specialty Code Oregon Secretary of State, Oregon Administrative Rules Database · checked Adopted codes online Oregon Building Codes Division · checked
Ground cover, vented crawl space Closed vs vented → The ground of an under-floor space must be covered by a Class I vapor retarder, lapped not less than 12 inches at the joints and extended not less than 12 inches up the perimeter foundation walls. ORSC R408.2.1 2023 Oregon Residential Specialty Code (ORSC) Oregon Building Codes Division · checked
Ventilation Closed vs vented → Minimum net area of ventilation openings is 1 square foot per 150 square feet of under-floor area where radon-mitigating construction is required under ORS 455.365, and 1 square foot per 1,500 square feet where it is not. ORSC R408.2.2 2023 Oregon Residential Specialty Code (ORSC) Oregon Building Codes Division · checked
Vent screens Ventilation openings must be covered by one of the permitted materials, with openings no larger than 1/4 inch in least dimension. Louvers are prohibited where radon-mitigating construction is required under ORS 455.365, aligning with the radon appendix. ORSC R408.2.4 2023 Oregon Residential Specialty Code (ORSC) Oregon Building Codes Division · checked
Sealed (unvented) crawl space Closed vs vented → The vapor retarder must overlap 12 inches where joints are not sealed or taped, and its edges must extend not less than 12 inches up the stem wall. Unvented crawl spaces are not allowed where radon-mitigating construction is required under ORS 455.365, unless an approved mechanical ventilation system is provided in accordance with the exception in Section AF103.5, and the rest of this section is satisfied. ORSC R408.3 2023 Oregon Residential Specialty Code (ORSC) Oregon Building Codes Division · checked
Floor insulation in an existing house The existing-building table lists underfloor insulation at R-25 where nominal joist depth is 10 inches or less, and R-30 where it is deeper. The R-30 in the new-construction table is not the retrofit requirement. ORSC Table N1101.2 2023 Oregon Residential Specialty Code, Chapter 11 — Energy Efficiency Oregon Building Codes Division · checked
Excavation near a foundation Exterior foundation waterproofing → An excavator must notify the Oregon Utility Notification Center at least two full business days, and not more than ten, before digging. An owner digging on their own land is exempt only for excavations under 12 inches deep outside an easement. OAR 952-001-0050 OAR 952-001-0050 — Excavator to Give Notice of Proposed Work; Exemption Oregon Secretary of State · checked

Contractors and contracts

Contractors and contracts: Oregon and Washington rules with their sources
Topic The rule Written in
Contractor licence Verifying a contractor → Anyone who undertakes, offers or bids work as a contractor must hold a current CCB licence. An owner working on their own property is exempt, unless the work is done as a business to sell the house. ORS 701.021; ORS 701.010(7) ORS 701.010 — Application of chapter (exemptions), and ORS 701.021 — Licensing requirement Oregon Legislative Assembly · checked
Bond and insurance Verifying a contractor → Every licence endorsement carries its own minimum surety bond and liability insurance, maintained throughout the licence period. The bond pays out only after a court judgment or arbitration award. CCB licensing rules Licensing Oregon Construction Contractors Board · checked CCB License Oregon Construction Contractors Board · checked Consumer Protection Oregon Construction Contractors Board · checked
A written contract, once the price passes $2,000 Bid checker → A contractor may not perform work to construct, improve or repair a residential structure for a property owner without a written contract if the aggregate contract price exceeds $2,000. If a contract started under $2,000 and grows past it, the contractor has five days from when they knew or should reasonably have known to deliver a written one. ORS 701.305(1) ORS Chapter 701 — Construction Contractors and Contracts Oregon Legislative Assembly · checked
Seven things the contract must contain Bid checker → Where ORS 701.305 requires a written contract, the contract or an attached addendum must contain: the contractor’s name, address, phone number and CCB licence number as shown on board records; acknowledgement of a written warranty offer where ORS 701.320 requires one, showing acceptance or rejection; a conspicuous explanation of the property owner’s rights under the contract, including the ability to file a complaint with the board and the existence of any mediation or arbitration provision; the customer’s name and address; the address where the work is performed; a description of the work; and price and payment terms. All of it legible and in dark ink. OAR 812-012-0110(1) OAR 812-012-0110 — Terms of Written Contract Oregon Secretary of State · checked
Three notices, delivered no later than signing Bid checker → A contractor required to have a written contract must deliver the Consumer Protection Notice, the Notice of Procedure, and the Information Notice to Owner About Construction Liens on or before the date the contract is entered into, and must keep proof of delivery for two years. OAR 812-012-0130; ORS 701.330; ORS 87.093 OAR 812-012-0130 — Delivery and Proof of Delivery of Consumer Notice Oregon Secretary of State · checked
Cancellation until midnight the next business day Bid checker → A property owner who enters into an initial written contract for the construction, improvement or repair of a residential structure they own may cancel it by delivering written notice of cancellation any time before 12 midnight at the end of the next business day. The notice can be in any written form, including email. ORS 701.310 ORS Chapter 701 — Construction Contractors and Contracts Oregon Legislative Assembly · checked
Complaint deadline Verifying a contractor → For work on an existing home, the CCB must receive a complaint within one year of substantial completion or of the date work stopped, and the owner must first give the contractor 30 days’ notice by certified mail. CCB consumer protection Consumer Protection Oregon Construction Contractors Board · checked

Owners, sellers and inspections

Owners, sellers and inspections: Oregon and Washington rules with their sources
Topic The rule Written in
Owner electrical work Doing the work yourself → An owner needs no electrical licence for work on their own residential property that is not intended for sale or rent. That is an exemption from licensing, not from permits: in Portland a residential electrical permit and inspection are still required. ORS 479.540(1) ORS 479.540 — Exemptions (electrical licensing) Oregon Legislative Assembly · checked Lights, outlets, switches, and service reconnect for residential electrical permits City of Portland, Permitting & Development · checked
Home inspections Inspection findings → A certified home inspector must enter the crawl space unless access is obstructed or entry would be damaging or dangerous, and report signs of abnormal water penetration, but is not required to report causes or the cost of repairs. OAR 812-008-0200 to 0214 Home inspector standards of behavior and standards of practice Oregon Construction Contractors Board · checked
Seller disclosure Selling with a crawl space problem → A seller of one to four residential units must deliver a property disclosure statement, answered from actual knowledge, which asks about moisture and water penetration. The buyer may revoke within five business days of delivery. ORS 105.462 to 105.490 ORS Chapter 105 — Seller’s Property Disclosure Statement Oregon State Legislature · checked
Floor insulation incentive Energy Trust rebates → Energy Trust’s floor insulation incentive requires existing insulation of R-11 or less, insulated to R-30 or greater or to fill the cavity, on a home served by a participating utility. A self-installer or a licensed non-trade-ally contractor can qualify. Energy Trust form PI 320I, 2026 Residential Incentive Information Sheet (Oregon and Washington) Energy Trust of Oregon · checked Insulation — Residential incentives Energy Trust of Oregon · checked

Across the river

Across the river: Oregon and Washington rules with their sources
Topic The rule Written in
Washington licensing Verifying a contractor → An Oregon CCB licence has no force in Clark County. Contractors register with Washington Labor & Industries, whose register also shows workers’ compensation standing and lawsuits against the bond. Washington L&I Verify a Contractor, Tradesperson or Business Washington State Department of Labor & Industries · checked
The NOTICE TO CUSTOMER disclosure, before work starts Bid checker → A contractor agreeing to repair, alter or construct four or fewer residential units must give the customer the statutory NOTICE TO CUSTOMER disclosure — in the prescribed wording and type — before starting work on the project, once the bid or contract price totals $1,000 or more. The disclosure states the registration number, the bond or deposit amount, and that the bond may not be sufficient to cover a claim. RCW 18.27.114(1) RCW 18.27.114 — Disclosure statement required; prerequisite to lien claim Washington State Legislature · checked

Code rules apply to construction and to work that triggers them; whether a repair to an existing crawl space does is decided by the local building department. Permit requirements are deliberately not in this table, for the reason given in the backlog below.

What is not here, and why

A reference section is only as good as its honesty about its own edges. These topics were considered for this hub and are not published. Each says what is holding it back, so you know whether the gap is research, editorial priority, or a subject that cannot be answered accurately at all.

Oregon Crawl Space Code Requirements
Substantially covered today by /resources/closed-vs-vented-crawl-space/, which quotes the same R408 provisions. Publishing a second page on identical material would split the cluster rather than add anything. The forward-looking half of this topic — what the next edition changes — is now published separately at /oregon/2026-crawl-space-code-changes/, which is a distinct question rather than a restatement. A compact current-requirements reference table remains worth building only if it is genuinely different in form from the existing article.
Oregon vs Washington: What Differs Across the Columbia
Sources are in hand and verified — this one is ready to write, not blocked on research. Held back only so the licence-verification page can establish the section first; a comparison page is more useful once there is something to compare against. Build next. Note that /tools/bid-checker/ now covers one slice of the comparison — contract and notice requirements either side of the Columbia, sourced to ORS 701, OAR 812-012 and RCW 18.27.114 — so this page should pick up licensing, bonding, incentives and the complaint process rather than restating that.
Energy Trust Crawl Space Incentives
Already published, and well, at /resources/energy-trust-rebate-2026/ — every figure traced to Energy Trust form PI 320I v2026.5. This section links to it rather than duplicating it. Listed here so nobody mistakes its absence for an oversight.
Permit Requirements for Crawl Space Work
NOT PUBLISHABLE ACCURATELY. There is no single authority: the City of Portland, Multnomah, Washington and Clackamas counties, and Clark County WA each set their own thresholds, and the answer varies by scope within each. Nothing verified so far supports a rule a homeowner could rely on, and a page that guessed would be worse than no page — a wrong permit answer costs real money. Would need per-jurisdiction confirmation, ideally direct from each building department, before anything is written.

The standard applied here

  • Primary sources only. The body that sets the rule or holds the register — not a trade association's summary of it, and not another contractor's blog.
  • Editions and versions are named. Building codes and incentive schedules are revised. A citation that does not say which edition it read is not checkable.
  • Verification dates are real. When a page says a source was checked on a date, it means the document was opened on that date and still said what the page reports.
  • Limits are stated. Where something varies by jurisdiction or could not be confirmed, the page says so instead of generalising.
  • The commercial interest is disclosed. This site earns money referring homeowners to contractors. That is a reason to read it critically, and saying so is more useful than pretending otherwise.

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