Crawl Space Repair Services in Portland, OR

The eight crawl space repair services compared: what each one fixes, what it costs, which ones go together, and how to read the bids. Free in-home inspection from a licensed contractor, no pressure to proceed.

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A finished crawl space in a Portland-area home: clean white reinforced vapor barrier across the soil, walls sheeted to match, ductwork overhead, the typical end state after a full crawl space repair scope

Every inspection, quote, and repair is handled by an independent contractor licensed by the Oregon CCB (or Washington L&I across the river). We do the matching; they do the work.

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Overview

What Crawl Space Repair Covers in Portland

"Crawl space repair" is one phrase covering a handful of very different jobs. Whatever happens in the gap between the soil and the floor framing under your house tends to get filed under this label, but in the Portland metro it almost always comes down to three problems: moisture (encapsulation, vapor barriers, drainage, sump pumps), heat loss (insulation replacement, rim joist sealing), and what the moisture eventually grows or attracts (mold remediation, rodent exclusion).

Different homes in the metro have different needs. A 1925 craftsman in Sellwood with a dirt floor and original old-growth Douglas fir joists is a different project from a 1985 ranch in Beaverton with sagging fiberglass batt and a torn 4-mil vapor barrier. The soil matters too: Willamette silt loam in the lowland neighborhoods holds winter water at the foundation for months, while Cascade clay in the West Hills sheds it downhill toward whoever lives below. A licensed contractor inspects the actual conditions, identifies the moisture source, and recommends the specific combination of services your home needs. Most homes need two or three of the eight services listed below, not all of them.

Scopes combine in predictable ways, and cold floors are a good illustration of why. Cold floors on their own sound like an insulation problem, but batt insulation rarely fails on its own — it falls because it got wet, and it got wet because something else let water or vapor in. So the inspection that starts with cold floors often ends up looking at the condition of the vapor barrier, and at where any standing water is coming from, which may be as simple as a disconnected downspout extension or as involved as a perimeter drain. Fix the insulation alone and you have bought yourself the same failure again in a few winters. That is why most homes need two or three of the eight services below rather than one, and why a written line-item quote matters more than a single headline number.

Which crawl space repair comes first

Where a home needs more than one of the eight, the water sets the order. Standing water or active seepage means drainage or waterproofing first, because a liner laid over a live water problem only hides it. Framing repair is scheduled with that moisture work rather than after it, so the new wood does not go into the crawl space that destroyed the old wood. The ground cover follows once the soil is no longer taking on water: a vapor barrier where the vents stay open, encapsulation where the crawl space is being sealed. Insulation is the last thing in, because batt that got wet once gets wet again for as long as whatever wet it is still there, and mold remediation follows the same rule wherever it falls: remove the growth and correct what fed it, or it is back within months.

Worth knowing before you get quotes: floor insulation and rim joist insulation are the parts of a crawl space project that Energy Trust of Oregon pays an incentive toward, on a home heated by a participating utility. The barrier, the dehumidifier and the vent sealing are not rebated on their own. A Trade Ally is not required: a contractor with a current Oregon CCB license, or an active Washington contractor license for a Washington project, can install eligible work, and floor insulation can be self-installed. If your scope includes insulation, have the existing R-value documented during the inspection, before anything is removed — our 2026 rebate guide covers the current amounts and the 60-day filing deadline that catches people out.

8 distinct services Most homes need two or three, not all eight.
2-5 days typical project length Vapor barrier alone: one to two days.
$3,225+ entry scope Code-compliant vapor barrier, installed (modelled).
R408.3 Oregon code section The clause that permits sealed crawlspaces, and sets what one has to include.
All Crawl Space Services

Eight Services Covered by Licensed Contractors

Each service has its own page with detailed pricing, signs to watch for, process steps, and FAQs specific to Portland metro homes.

Pricing

What Crawl Space Repair Costs in Portland

Each service has its own range, and most homes combine two or three of them. These are the same 2026 modelled ranges the cost guide publishes, with the method behind them set out in full.

Service Typical Range What Pushes It to the High End
Vapor Barrier Installation Cost detail → $3,225–$4,425 Premium 20-mil cross-laminated barrier with wall coverage and double-sealed seams ($4,675–$6,375 total)
Crawl Space Drainage $3,825–$6,800 Complex hillside systems with multiple interceptors and long discharge runs ($7,225–$13,600)
Crawl Space Waterproofing Cost detail → $3,825–$6,800 Hillside lots with long discharge runs or significant existing flooding ($7,225–$10,100)
Sump Pump Installation Cost detail → $1,525–$2,975 Battery backup pump ($2,125–$3,825) or full drainage system with sump ($3,825–$6,800)
Crawl Space Encapsulation Cost detail → $10,100–$12,325 Dehumidifier, closed-cell rim joist foam, and full premium scope ($14,875–$20,400)
Insulation Replacement $2,375–$5,525 Spray foam on foundation walls, closed-crawl approach ($3,825–$7,650)
Mold Remediation $1,525–$3,825 Full-area remediation paired with encapsulation or drainage to fix the source ($5,525–$10,100 combined)
Basement Waterproofing $7,225–$15,300 Dual sumps, large dehumidifiers, and finish replacement ($17,000–$25,500)
Foundation Waterproofing $15,000–$38,000 Hillside lots with shoring, deep excavation, or difficult access (beyond $38,000)

Prices assume an average 1,200 to 1,500 sq ft Portland-metro crawlspace in typical condition.

Comparing bids

How to Compare Crawl Space Repair Bids

Portland Crawlspace Pros does not do the work; it routes each request to an independent licensed contractor. Choosing one is covered on the home page, under crawl space contractors in Portland, and how to verify an Oregon or Washington contractor walks through both state license lookups. What follows is for the stage after that, when there are two or three written bids on the table.

Insist on a written, line-item scope

A crawl space bid should name what is being installed and how much of it: vapor barrier thickness and coverage, insulation R-value and square footage, drain length and sump model, dehumidifier capacity, and what happens to the old material. A single lump-sum number cannot be compared with anything. The bid checker goes through a quote against the contract terms Oregon and Washington require.

Ask what the evidence is

The most expensive disagreements between bids are about water. A drainage system and sump pump are the right answer for a crawl space with standing water and the wrong one for a dry crawl space with a torn barrier. A contractor recommending drainage should be able to show you the water, the tide line on the stem wall, or the photos from the wet season. The crawl space inspection guide lists the four questions that turn a pitch into a diagnosis.

Compare scopes, not headline prices

Two bids thousands of dollars apart are often quoting different jobs. Line them up item by item before deciding which contractor is expensive. Where one includes encapsulation and a dehumidifier and the other a barrier replacement, the question is which problem you actually have, not which crew is cheaper.

Common Symptoms

Problems That Lead to Crawl Space Repair

If you recognize any of these in your home, the inspection will identify which combination of the eight services solves it.

See all crawl space problems and what causes them

Process

How Crawl Space Repair Works

  1. Tell us about your crawlspace

    Answer a few questions about the house and what you are seeing. Takes less than 2 minutes.

  2. Get matched with a contractor

    Your request goes to a licensed contractor who covers your ZIP: Oregon CCB, or Washington L&I across the river.

  3. Free in-home inspection

    The contractor visits, assesses conditions, and provides a no-obligation quote.

  4. Approve and schedule

    Review the scope, approve when ready. All work performed by the licensed contractor.

Questions, Answered

Crawl Space Repair FAQs

Ready to Fix Your Crawlspace?

Get matched with a licensed local contractor - Oregon CCB, or Washington L&I across the river - for a free in-home inspection, with no obligation.

Free Inspection (503) 210-5062

Sources

The R408 unvented-crawlspace mechanics and the ORS 455.365 radon-county exception cited in the FAQ above, and the Energy Trust incentive measures and installer rules in the overview callout and the rebate FAQ.

  1. Oregon Building Codes Division, 2023 Oregon Residential Specialty Code (ORSC) (2023 edition, based on the 2021 IRC) Checked

    Section R408 under-floor space requirements: ventilation openings and ratios for vented crawl spaces, Class I vapor retarder coverage and lap dimensions, and the three conditioning methods that permit an unvented crawl space: continuously operated mechanical exhaust or a conditioned air supply, each at 1 cfm per 50 square feet, or dehumidification sized in accordance with the manufacturer’s specifications (R408.3 item 2.3), which sets no pints-per-day figure. Also R408.2.4, which lists the six permitted ventilation-opening coverings and caps their least dimension at 1/4 inch — the figure that decides whether a code-compliant foundation vent screen excludes mice as well as rats.

    Note: Effective October 1, 2023 (construction provisions mandatory April 1, 2024). The 2026 edition took effect October 1, 2026. Under OAR 918-480-0005 this 2023 edition, apart from Chapter 1, stays adopted through March 31, 2027, and building departments must accept plans designed to either edition until then, so confirm which one a permit is reviewed under before relying on a section number. What did and did not change for crawl spaces is tracked at /oregon/2026-crawl-space-code-changes/.

  2. Oregon Building Codes Division, 2026 Oregon Residential Specialty Code — RMSB review code review matrix (Structural, Fire and Life Safety, Mechanical) (26orsc-matrix.pdf, 17 pages) Checked

    Every crawl space entry in the 2026 code tracker: the R408.2 under-floor vapor retarder, ventilation ratio, vent placement and vent covering amendments (page 9, outcome Retain); the committee’s approved add-back permitting a continuously operated mechanical ventilation system at 1.0 cfm per 50 square feet in place of foundation vents (page 9, outcome Approve); the R408.3 unvented crawl space amendment (page 9, outcome Retain); the deletion of R408.8 (page 9, outcome Approve); and Appendix BE (AF) Radon Control Methods (page 15, outcome Retain).

    Note: A record of what the code review committee recommended, which the Residential and Manufactured Structures Board approved and sent to public hearing. It is not the adopted code text. The adopting rule takes the 2024 IRC “as further amended by the Division”, and this site has not yet been able to read the published 2026 ORSC to confirm that each outcome recorded here carried through unchanged.

  3. Oregon Health Authority, Radon Program Checked

    Radon testing guidance and action levels for Oregon homes, referenced because sealing a crawl space changes how soil gas enters a house.

  4. Energy Trust of Oregon, Residential Incentive Information Sheet (Oregon and Washington) (Form PI 320I, version PI 0320I v2026.5 (rev. 260909), effective January 1, 2026) Checked

    Every 2026 incentive figure quoted on this site: per-square-foot amounts for floor and wall/rim joist insulation by occupancy type and by state, the R-11-or-less existing floor insulation threshold and the R-30 insulate-to target, the R-4-or-less wall and rim joist threshold, the 60-day submission deadline, the paid-in-full invoice requirement, and the list of participating utilities. One document carries both states: pages 1-6 are the Oregon sheet, pages 7-9 the Washington sheet, which is why the Washington figures cite the same form.

    Note: Energy Trust states incentives are subject to funding availability and may change. Confirm the current amount before budgeting around it. Washington-side floor insulation is an Energy Trust incentive for NW Natural-heated homes, not a NW Natural program - NW Natural’s own residential rebates cover furnace conversion, fireplaces, tankless water heaters and generators, and include no insulation measure.

  5. Energy Trust of Oregon, Insulation — Residential incentives Checked

    That Energy Trust publishes self-installation guidelines for floor insulation in its Specification Manual and strongly encourages anyone planning to self-install to schedule a call with an Energy Advisor first; that applications for contractor-installed work must be signed by the installing contractor; and the floor insulation conditions of existing insulation at R-11 or less, insulated to R-30 or greater or to fill the cavity.

    Note: The page does not set out every condition a self-installed project must meet. Confirm with Energy Trust before starting if the incentive matters to the budget; incentives are subject to funding and can change.

Sources last checked between and ; the date beside each one is when it was last opened. Where a figure comes from a document that is revised on a schedule, the edition or version is named above so you can confirm it against the current one yourself.