Basement Waterproofing Cost in New York City (2026)
Average cost in New York City
$1,500 – $13,500
$3 – $12 per sq ft
In New York City, the average is $5,842 and most projects cost between $1,500 and $13,500, or about $3 – $12 per sq ft. Prices are before tax and based on 8 sources.
Cost Breakdown
ItemizedSpecialized NYC trade rates ($125-$200/hr)
55%
Membranes, sealants, and drainage hardware
28%
NYC DOB filing and structural review
10%
8.875% combined rate on materials
7%
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 project
LiveYour estimate in New York City
Likely range $2,629 – $12,852
- Labor55%$3,213
- Materials28%$1,636
- Permits & Inspections10%$584
- Sales Tax7%$409
Interior sealant
$5,842
Interior drainage / weeping tile
$9,347
Exterior excavation
$14,021
Calibrated to 8 researched sources for New York City. Before tax. Real quotes vary with site conditions.
📈Price Momentum
Year-over-year~1 year ago
$5,553
Today
$5,842
Basement Waterproofing in New York City is ↑ 5.2% compared to roughly a year ago — about $289 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 New York City
Verified providersA.M. Shield Waterproofing Corp.
33 Albertson Ave, Albertson, NY 11507, USA
222 reviews
Quality 1st Basement Systems
359 NJ-35 South, Cliffwood, NJ 07721, USA
2,207 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 typically 15-30% higher due to labor rates averaging $125-$200 per hour and the complexity of working in dense urban environments with aging infrastructure and strict safety regulations.
Yes, most structural or excavation work requires a permit from the NYC Department of Buildings (DOB). Simple permits cost between $150 and $500, while major excavation projects can reach several thousand dollars in filing fees.
Interior solutions, such as French drains and sump pumps, average around $3,000. Exterior excavation, which is more permanent but invasive, typically starts at $7,000 and can exceed $20,000 for tight urban lots.
Older brownstones and pre-war buildings often have porous masonry foundations. Sealing these requires specialized epoxy injections or multi-layer membranes, which can increase material costs by 20% compared to modern poured concrete.
📊Our Methodology
How we collect dataAggregated from 8+ 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.
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