Basement Waterproofing Cost in New York City (2026)
Average cost in New York City
US$3,485 — US$13,500
US$4 — US$10 per sq ft
Cost Breakdown
ItemizedSkilled trade rates ($125-$200/hr)
55%
Sealants, membranes, and 8.875% sales tax
25%
DOB filing fees and expediter services
10%
Jackhammering and debris removal
10%
Sales Tax at 4%
📋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$8,000 — US$12,000
Based on 12 sources and market data for New York City. Actual costs may vary depending on specific project requirements.
🏢Top Waterproofing Contractors in New York City
Verified providersUnified Masonry & Waterproofing
77 Sands St, Brooklyn, NY 11201, USA
78 reviews
Basement Waterproofing Brooklyn Pros
550 Throop Ave Ste D4, Brooklyn, NY 11221, USA
20 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
NYC costs are roughly 15-20% higher due to labor rates of $125-$200 per hour, complex underground infrastructure, and the high cost of manual excavation in dense urban areas like Brooklyn and Manhattan.
The NYC Department of Buildings (DOB) charges a minimum of $130 for projects under $5,000, plus $2.60 for every additional $1,000 in project value. Major structural or exterior work often requires an expediter, adding $2,500 to $5,000 in soft costs.
A professional sump pump installation in NYC typically ranges from $1,412 to $1,982. If the project requires cutting through concrete floors, costs can increase by an additional $2,000 to $5,000.
Yes, a combined sales tax of 8.875% applies to the material portion of the project. However, under New York state law, labor for capital improvements is generally not taxable, which can save homeowners significantly on large-scale projects.
📊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: today. Updates run weekly. All costs in USD.