Portland Crawlspace Cost Index

The index

Typical range is the band most Portland-metro quotes for the reference project fall within. The premium band is a different and larger scope, not a more expensive contractor — the conditions that trigger it are named in the same row. Expand any service for the full included and excluded line items.

Reference project for every row: 1,200 to 1,500 square feet of crawl space floor, damp but without standing water at the time of the quote, a standard exterior or interior hatch with roughly 3 feet of working clearance, on a single-family home on a continuous perimeter foundation, in the Portland/Vancouver metro, priced in 2026 dollars.

Scope, assumptions and limitations by service

This is the half of the dataset that a price column cannot carry, and the half that explains why two Portland quotes for the same word can differ by thousands. Read it as a checklist against a written scope of work.

Excluded from every range in this dataset

• Permit fees, which vary by jurisdiction and are usually billed at cost
• Structural repair of framing found to be rotten once the space is opened up
• Asbestos or lead abatement, which requires separately licensed contractors
• Electrical service upgrades where an existing panel cannot carry new equipment
• Landscape or hardscape restoration after exterior excavation

What moves a Portland project inside these ranges

Every row above publishes a band rather than a figure, and the width of that band is not uncertainty about the market. It is four properties of the specific house. Anyone applying one of these ranges to a real address needs to know which end of the band that address sits at, because for most services the two ends differ by a third or more — quoting the midpoint of a band to a hillside pre-war house is not a conservative estimate, it is the wrong number.

These four are the drivers that recur in this metro specifically. They are the same drivers the homeowner-facing cost guide describes in narrative form; here they are set out as the variables that determine position within a published range.

Housing era and what was originally built

The strongest single predictor in the Portland metro, because it decides whether a job is a retrofit or a replacement. Pre-1940 inner-Portland housing stock frequently has a dirt floor, low clearance and no functioning barrier at all, which puts the whole scope in play and lands at the upper end. Tract housing from the 1970s through the 1990s across the western suburbs usually has a degraded thin poly barrier and failed batt insulation over an otherwise sound crawl space — a defined replacement scope, and the middle of the band.

Access and working clearance

A pure labour multiplier, and the one most often missing from a quote a homeowner is comparing. The reference project assumes roughly three feet of clearance and a standard hatch. Below about eighteen inches the same material takes materially longer to place, spoil and debris have to be moved by hand, and some equipment stops fitting. Two identical square footages with different clearance are not the same job and should not be read off the same point in the range.

Moisture severity, and whether it is still active

This drives sequence as much as price. Standing water or active mold adds remediation before the priced work can begin, and it usually means the moisture source has to be fixed first, which is a separate row in this table rather than a surcharge on this one. A range for encapsulation assumes a damp space, not a wet one; a wet space is normally two rows of this index, in order, not the top of one.

Hillside position and drainage complexity

The Portland-specific driver that pushes projects past the top of the typical band and into the premium column. On lots that intercept water moving downhill, the entry path is groundwater under pressure rather than saturated soil, and the fix is exterior interception rather than interior management. A curtain drain runs $2,125–$5,100 on top of the interior work, and roof and surface water rerouting a further $675–$2,125. Long discharge runs to an approved point compound both. This is the difference between the typical and premium columns on the drainage and waterproofing rows.

Placing a specific property in these bands. The crawl space cost calculator is built from the same base ranges published here, and a build-time check holds it to reproducing the row above whenever it is asked about the reference project this table prices. Its own six inputs are not the four drivers listed above, though: it asks about service, floor area, moisture, access, insulation condition and timeline, so it will return figures outside a row's typical band by design as those inputs move away from the reference project. It returns a narrowed range, not a quote: only a contractor who has been under the house can produce one of those.

What the data basis labels mean

Every value this site publishes carries one of four classifications. They are not interchangeable, and the difference between the first and the third is the difference between a measurement and a judgement. Check the label before you reuse a number.

MEASURED Measured

A value reported directly by the authority that holds it, or read out of a legitimate published dataset without alteration. A code requirement quoted from the adopted code, an incentive amount read off the incentive sheet, a rainfall total from the National Weather Service.

In this dataset: No row of the cost index is measured, and no published price on this site is. Measured values do appear elsewhere: the Energy Trust incentive amounts and the Oregon code requirements are quoted from their source documents, and the precipitation normals, housing-age estimates and place boundaries in the Portland Metro Crawlspace Climate and Housing dataset are read from NOAA, Census and USDA outputs without alteration.

DERIVED Derived

A value calculated from measured inputs by a stated formula, where both the inputs and the formula are published so the result can be recomputed independently.

In this dataset: No row of the cost index is derived. The cost calculator derives an adjusted range from a modelled base range, which makes its output modelled, not derived — a calculation performed on an estimate returns an estimate. Two columns of the climate and housing dataset genuinely are derived: the October–March precipitation totals, summed from NOAA’s published monthly normals, and the soil drainage shares, area-weighted from published SSURGO map units. In both cases the inputs are measured, the formula is published, and the result can be recomputed independently — which is what separates this tier from the one below it.

MODELED Modeled

An editorial estimate, built from a defined scope, material quantities at local market prices, the labour time the work takes under stated conditions, and the overhead a licensed contractor carries. It is a considered judgement about a market, published with its assumptions, not a measurement of one.

In this dataset: Every row of the cost index. This is the honest label for what this dataset is, and it is the reason the ranges are published as bands rather than as point estimates.

OBSERVED_QUOTE_DATA Observed quote data

A range computed from a sample of real quotes issued to real homeowners, published with its sample size, its median, and the dates the quotes were issued. Reserved for future use under a stated threshold of 30 quoted projects per service.

In this dataset: Nothing. This site does not hold a database of Portland contractor quotes and does not present one. The classification is defined here so that the day such data exists it lands in a slot whose meaning was fixed before anyone had an interest in stretching it.

Download

Both files are generated at build time from the same file the website reads, so a download cannot fall out of step with the page. Each carries the dataset title, version, methodology URL, geography and reuse terms inside the file itself, so it still says what it is once it has been separated from this page.

Field dictionary

The same field names are used in both formats. This table is the source the downloads are built from, so a column cannot exist in a file and be missing here.

How to cite this

Use this form, or any form that carries the publisher, the dataset name and the review date:

Portland Crawlspace Pros. "Portland Crawlspace Cost Index." Updated September 2026. PortlandCrawlspacePros.com.

Please state the review date alongside any figure you quote, because the ranges are revised — a 2026 figure republished in 2028 with no date attached becomes a claim this site did not make. Linking to this page or to the methodology lets your reader check the basis for themselves.

What not to say. These are not average quotes, not a survey of contractors, not a market study, and not peer reviewed. They are one publisher's modelled estimates for a stated reference project. Portland Crawlspace Pros is a lead-matching and marketing service, not a licensed contractor: it does not perform crawl space work, does not issue quotes, and has not priced any of the jobs described above. It earns a flat fee from the independent Oregon CCB and Washington L&I licensed contractors it refers homeowners to, and those contractors — never this site — carry out every inspection, scope, warranty and dollar of the work. That is a reason to read these figures critically, and worth stating here rather than leaving to be discovered.

Maintenance and corrections

• Last reviewed: September 1, 2026. This moves only when someone actually re-examines the ranges against the market — never because the site was rebuilt or an unrelated page was edited.
• Next scheduled review: February 1, 2027.
• Update cadence: annual. The review is scheduled for the weeks after Energy Trust of Oregon's residential incentive sheet takes effect on January 1, so these ranges and the rebate figures quoted elsewhere on this site move on one cycle instead of drifting apart between them. An out-of-cycle revision happens only when something changes enough to make a published figure wrong before the next review, and it is logged below with everything else. If the review date above is more than about a year old, treat the figures as stale and say so wherever you cite them.
• Methodology: How these figures are produced, including the reference project, the step-by-step method, the definitions and the limitations.
• Found an error? If a figure here does not match what you are seeing in the Portland market, or a scope line is wrong, tell us. Say which service and what you are seeing. Corrections that change a number are recorded in the revision log below with the date they were made.

Recent revisions

If you cited a figure from this dataset, this is where you check whether it has moved since. The three most recent changes are below; the full revision history is kept on the methodology page.

1. September 1, 2026

   Reviewed every range against published third-party ranges (Angi, HomeGuide) adjusted to Portland. Seven of nine services corroborated; three (drainage, crawl space waterproofing, sump pump) were conservative at the top of their bands and were left alone. Foundation waterproofing was corrected from $21,250-$42,500 to $15,000-$38,000: its old low sat 12% ABOVE the adjusted third-party high, the only row on this site whose range did not overlap the market at all, and a bottom-up check of its own components (perimeter footing drain plus membrane) supported roughly $10,000-$25,000 before excavation. The row had been priced as though every job were a hillside worst case, which highEndNote already covers separately. Basement waterproofing was flagged (its high sits ~21% above the adjusted third-party interior ceiling) but left unchanged pending the February review. Full working: audit/market-validation-2026-09-01.md.

2. August 20, 2026

   Documented provenance. Every range is labelled a modelled estimate, the reference project and universal exclusions are published, and per-service included/excluded line items were added. Two claims that the figures came from collected contractor pricing were removed as unsupportable — no such dataset exists yet. No dollar figure changed.

3. August 9, 2026

   Consolidated every figure into this file. The cost calculator had been quoting crawl space waterproofing at $3,825–$7,650 while the price table and service page said $3,825–$6,800, overquoting by $850 for an unknown period. The calculator now derives its ranges from this table and cannot drift again.