Basement Waterproofing Cost in Portland (2026)
Average cost in Portland
$2,094 – $15,000
$4 – $10 per sq ft
In Portland, the average is $4,944 and most projects cost between $2,094 and $15,000, or about $4 – $10 per sq ft. Prices are before tax and based on 11 sources.
Cost Breakdown
ItemizedSkilled waterproofing technicians ($180-$220/hr)
42%
Membranes, sealants, and vapor barriers
28%
Interior French drains and piping
18%
Submersible pump with basin and discharge line
8%
City of Portland structural and plumbing permits
4%
None at 0%
📋What's Included
ScopeTypically Includes
- Interior drain tile system
- Sump pump installation
- Vapor barrier
- Crack injection sealing
- Labor
Typically Excludes
- Exterior excavation waterproofing
- Foundation repair
- Mold remediation
- Dehumidifier
- Landscaping restoration
Based on interior waterproofing for a standard 800-1,000 sq ft basement.
🧮Estimate your project
LiveYour estimate in Portland
Likely range $2,225 – $10,877
- Labor42%$2,076
- Materials28%$1,384
- Drainage Systems18%$890
- Sump Pump Installation8%$396
- Permits & Inspections4%$198
Interior sealant
$4,944
Interior drainage / weeping tile
$7,910
Exterior excavation
$11,865
Calibrated to 11 researched sources for Portland. Before tax. Real quotes vary with site conditions.
📈Price Momentum
Year-over-year~1 year ago
$4,731
Today
$4,944
Basement Waterproofing in Portland is ↑ 4.5% compared to roughly a year ago — about $213 more on the average project.
Comparison derived from the year-over-year change rate, not a month-by-month price index. We don't store historical snapshots yet — when we do, this will become a real time series.
🏢Top Waterproofing Contractors in Portland
Verified providersBetter Basements and Waterproofing
19100 OR-99E Unit C, Oregon City, OR 97045, USA
251 reviews
Ability Plus Drainage Company
1725 SE Franklin St Ste B, Portland, OR 97202, USA
198 reviews
Foundations First Northwest
28655 SW Boones Ferry Rd, Wilsonville, OR 97070, USA
185 reviews
Provider data sourced from public business directories. Ratings and reviews are public and may change. LookupCost is not affiliated with listed providers.
💬What People Actually Paid
Community❓Common Questions
Yes, most projects involving structural changes, earthmoving, or new plumbing (like a sump pump) require a permit. Basic renovation permits start at $153 to $202, while larger projects are valuation-based.
A standard professional sump pump installation typically ranges from $1,200 to $2,800. For high-capacity systems with battery backups, costs can reach $5,000.
Interior solutions, which manage water already inside, average $3,000 to $5,000. Exterior waterproofing, which involves excavation to prevent water entry, is significantly more expensive, typically ranging from $7,000 to over $15,000.
While there are no specific tax credits, Portland homeowners benefit from Oregon's lack of sales tax, which can save 5-10% on material costs compared to neighboring states like Washington.
📊Our Methodology
How we collect dataAggregated from 5+ verified web sources and cost databases
Licensed contractor estimates and regional cost guides
Government construction and labor statistics
Community-reported project costs and reviews
Last data collection: 1 months ago. Updates run weekly. All costs in USD.
About this data
Cost figures are estimates synthesized from public market data using AI research and refreshed regularly. Real project costs vary by scope, materials, contractor, and site conditions. Always get verified quotes from licensed contractors for your specific project.
Spotted bad data? Let us know — we'll review and update.