Basement Waterproofing Cost in Portland (2026)
Average cost in Portland
US$650 — US$15,000
US$4 — US$10 per sq ft
Cost Breakdown
ItemizedExcavation and installation at $180-$220/hr
55%
Sealants, membranes, and drainage pipes
25%
Sump pump, basin, and backup battery
12%
Debris removal and site restoration
5%
Portland city renovation and plumbing permits
3%
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 Cost
InteractiveEstimated Cost
US$6,528 — US$9,792
Based on 9 sources and market data for Portland. Actual costs may vary depending on specific project requirements.
🏢Top Waterproofing Contractors in Portland
Verified providersBetter Basements and Waterproofing
19100 OR-99E, Oregon City, OR 97045, USA
210 reviews
Portland Construction & Restoration Solutions
14915 SW 72nd Ave, Portland, OR 97224, USA
811 reviews
Ability Plus Drainage Company
1725 SE Franklin St Suite B, Portland, OR 97202, USA
166 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 plumbing require a permit. Basic renovation permits in Portland start between $153 and $202, with additional fees for electrical or plumbing work.
A standard sump pump installation typically ranges from $1,200 to $2,800 for smaller scopes, while complex systems with battery backups can reach $5,000.
Interior solutions, such as French drains and sealants, average around $3,000 to $5,000. Extensive exterior excavation and membrane systems are significantly more expensive, often ranging from $7,000 to $15,000+.
Portland's tight labor market and specialized moisture-resistant technology requirements drive rates to between $180 and $220 per hour for experienced waterproofing professionals.
📊Our Methodology
How we collect dataAggregated from 9+ 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: today. Updates run weekly. All costs in USD.