Crawl Space Repair and Waterproofing in Portland, OR
Encapsulation, waterproofing, vapor barriers, drainage, and insulation for homes in the Portland metro. Licensed Oregon CCB or Washington L&I contractors, free in-home inspections, no-pressure quotes.
- Licensed local contractors
- Free in-home inspection
- No-obligation quote
01Common Symptoms
Cold floors in winter? A musty smell that lingers?
Crawlspace problems almost always show up first as something you notice upstairs. A hard freeze like January 2024's is when homeowners finally go looking for the source of cold floors. Pick the symptom that sounds familiar to see the likely cause underneath.
02Solutions
Crawlspace and Waterproofing Solutions
Browse by category, or choose a specific service below. Licensed contractors, Oregon CCB or Washington L&I, handle every inspection and all work.
Seal, drain, insulate, and protect
Encapsulation, waterproofing, vapor barriers, drainage, sump pumps, insulation replacement, mold remediation, and structural repair.
8 services →Stop leaks, seepage, and humidity
Interior perimeter drains, sump pumps, foundation crack injection, wall membranes, and dehumidification.
Solution details →Exterior membranes and footing drains
Sprayed and sheet membranes, drainage boards, and perimeter footing drains for new construction and remodels.
Solution details →03All Services
Every Service, in Detail
Each service page has full Portland metro pricing, the signs to watch for, process steps, and FAQs.
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Encapsulation
Seal your crawlspace with a heavy-duty vapor barrier and dehumidification system.
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Waterproofing
Interior drainage, perimeter systems, and membranes to stop water intrusion.
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Vapor Barrier
Heavy-mil reinforced vapor barriers stop ground moisture before it starts.
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Drainage Systems
Perimeter drains and grading solutions for crawlspaces with recurring water.
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Sump Pump
Sump basins and backup systems to manage water in high-moisture zones.
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Insulation Replacement
Remove wet, sagging, or rodent-damaged insulation and install proper R-value batt.
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Mold Remediation
Safe mold removal, antimicrobial treatment, and moisture source correction.
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Structural Repair
Floor joists, girders, support posts and footings, sequenced after the water that reached them.
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Basement Waterproofing
Interior and exterior solutions for Portland basement leaks and seepage.
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Foundation Waterproofing
Exterior membranes and drainage boards to protect foundation walls.
04How It Works
From Question to Quote in Four Steps
Built for homeowners who want a real quote, not a sales pitch. Every step is free.
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Tell us about your crawlspace
Answer a few questions about the house and what you are seeing. Takes less than 2 minutes.
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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.
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Free in-home inspection
The contractor visits, assesses conditions, and provides a no-obligation quote.
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Approve and schedule
Review the scope, approve when ready. All work performed by the licensed contractor.
05Hiring
How to Choose a Crawl Space Contractor in Portland
Portland Crawlspace Pros is a matching service, not a contractor: a request here goes to an independent licensed contractor, who does the inspection and the work. Whoever you hire, through this site or not, four checks are worth making before you sign.
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Look the license up yourself
Oregon requires an active Construction Contractors Board license for this work; across the river it is a Washington L&I registration. Take the number from the state's own lookup, not from a card or a truck door.
How to verify an Oregon or Washington contractor → -
Get the scope in writing, item by item
A bid should say what is being installed and how much of it. A single lump-sum figure cannot be compared with anything, and Oregon and Washington both set terms a written contract has to carry.
Check a quote with the bid checker → -
Ask what the recommendation rests on
The costliest disagreements between bids are about water. A contractor proposing drainage should be able to show you where the water is, where it has been, and the photographs of both.
What a crawl space inspection covers → -
Know the range before the visit
Each service has its own modelled 2026 Portland range, and most homes combine two or three. Two bids thousands of dollars apart are often quoting different jobs.
What crawl space repair costs in Portland →
Why Portland crawlspaces fail — in four numbers
06Free Tool
Estimate Your Project Cost
Get a Portland-area price range in about 60 seconds. No email required to see the estimate. The ranges are modelled estimates of the 2026 metro market, not collected contractor quotes.
- Modelled 2026 Portland metro ranges, with a published method
- Accounts for square footage, condition, and access
- Used as a starting point, not a binding quote
- Built on the Portland Crawlspace Cost Index, published with its basis and downloads
07Service Areas
19 cities, from inner Portland to Vancouver, WA
A 1925 bungalow in Sellwood, a 1985 split-level in Aloha, and a hillside build above Oswego Lake don't need the same work. Each city page sets out what the local soil, housing age and permit rules mean for a crawl space there.
- Portland Neighborhood by neighborhood
- Beaverton Westside, Washington County
- Hillsboro Silicon Forest area
- Lake Oswego Hillside and lakeside lots
- Tigard Washington Square area
- Tualatin SW corridor
- Gresham East Portland metro
- Oregon City Clackamas County
- Milwaukie Close-in eastside
- West Linn Willamette hillside
- Sherwood SW commuter zone
- Wilsonville South metro
Portland crawl space repair by neighborhood → View all service areas →
Frequently Asked Questions
- Depends entirely on what's wrong down there. 2026 ranges for Portland homes: a code-compliant vapor barrier runs about $3,225 to $4,425, a full closed-crawl encapsulation lands around $10,100 to $12,325, premium encapsulation with rim joist foam and a dehumidifier reaches $14,875 to $20,400, and a drainage plus sump system costs $3,825 to $6,800. Square footage, access height, standing water, and existing mold are the biggest variables. The cost calculator gives a fast range; a free in-home inspection from a licensed contractor gives a firm number.
- Every contractor doing crawl space repair in Oregon needs an active Construction Contractors Board license, and across the river a Washington L&I registration, so the search is for a licensed contractor who covers your address. Portland Crawlspace Pros is a matching service rather than a contractor. A request made here goes to an independent licensed contractor who covers your ZIP, and that contractor carries out the free inspection and any work you approve. Whoever you hire, through this site or not, look the license number up yourself with the Oregon and Washington license lookups, and run any written quote through the bid checker before you sign.
- Yes. Oregon Residential Specialty Code R408 permits both vented and unvented (sealed) crawlspaces. Vented crawlspaces require minimum net-free-vent area and a Class I vapor retarder over exposed ground. Unvented (encapsulated) crawlspaces require a sealed vapor retarder, sealed perimeter, and one of three conditioning methods: mechanical exhaust, supply air from the conditioned space, or dehumidification. In Portland's climate, sealed crawlspaces typically outperform vented ones because ventilation with warm, humid air can add moisture to a cool crawlspace rather than remove it. One local caveat: Oregon bars unvented crawlspaces in new construction in Clackamas, Multnomah, Washington and four other counties where radon-mitigating construction is required, unless an approved mechanical ventilation system is provided.
- Not as encapsulation. Energy Trust of Oregon pays per square foot for specific insulation measures, and the two a crawl space project usually claims are floor insulation (existing insulation at R-11 or less, new insulation to R-30 or more in a house) and rim joist insulation. The vapor barrier, dehumidifier and vent sealing are not rebated on their own. You do not need a Trade Ally: a contractor with a current Oregon CCB license, or an active Washington contractor license, can install eligible work, and Energy Trust publishes self-installation guidelines for floor insulation, though the higher rental and Savings Within Reach amounts need an enrolled trade ally. The application is due within 60 days of installation, and the home must be heated by a participating utility. The 2026 Energy Trust crawl space rebate guide has the current amounts for Oregon and Washington homes and the four ways people lose the incentive.
- Your request routes to a licensed contractor covering your ZIP, and they contact you to arrange the visit. The inspection is free and carries no obligation: the contractor goes under the house, photographs what is there, and gives you a written line-item quote you can take away and think about. If there is active water under the house, say so when you submit - that is the detail that changes how a contractor triages the visit.
- It depends on what caused the damage: a sudden event such as a burst pipe is the kind usually covered, while flood, sewer or drain backup and groundwater seeping through the foundation are among the losses most homeowner policies exclude. What homeowners insurance covers under a crawl space, in the Oregon and Washington regulators' own words, is set out in the full guide.
- Pre-1940 inner Portland neighborhoods (Sellwood, St. Johns, NE Alameda, Mt. Tabor, Laurelhurst, Hawthorne) often have low-clearance dirt-floor crawlspaces with original old-growth Douglas fir joists and minimal or missing vapor barriers. Hillside lots in Lake Oswego, West Linn, and the SW corridor see high water tables and drainage issues. 1970s-90s tract homes across Beaverton, Hillsboro, and Tigard typically have degraded poly vapor barriers and sagging or rodent-damaged batt insulation. Each pattern calls for a different scope.
- Portland Crawlspace Pros is a lead-matching and marketing service. The site connects you with independent Oregon CCB and Washington L&I licensed contractors who handle every inspection, quote, scope of work, warranty, and dollar of construction work. There is no charge for homeowners to use the matching service or to receive a free inspection. Contractors pay the site a flat fee for access to the lead flow, which keeps incentives aligned with you (more honest scopes win more referrals).
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.