Basement Waterproofing Cost in Philadelphia (2026)
Average cost in Philadelphia
$1,462 – $12,000
$3 – $10 per sq ft
In Philadelphia, the average is $5,402 and most projects cost between $1,462 and $12,000, or about $3 – $10 per sq ft. Prices are before tax and based on 8 sources.
Cost Breakdown
ItemizedProfessional installation and excavation
55%
Sealants, membranes, and gravel
20%
Sump pump and drainage pipes
18%
Philadelphia city building permits
4%
Debris removal and site cleanup
3%
Sales Tax at 6%
📋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 Philadelphia
Likely range $2,431 – $11,884
- Labor55%$2,971
- Materials20%$1,080
- Equipment18%$972
- Permits & Inspections4%$216
- Disposal3%$162
Interior sealant
$5,402
Interior drainage / weeping tile
$8,643
Exterior excavation
$12,964
Calibrated to 8 researched sources for Philadelphia. Before tax. Real quotes vary with site conditions.
📈Price Momentum
Year-over-year~1 year ago
$5,184
Today
$5,402
Basement Waterproofing in Philadelphia is ↑ 4.2% compared to roughly a year ago — about $218 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 Philadelphia
Verified providersJamison Basement Waterproofing
1429 Ulmer Ave b, Oreland, PA 19075, USA
1,786 reviews
Over the Top Waterproofing
2999 Welsh Rd Office B, Philadelphia, PA 19152, USA
183 reviews
Philadelphia Foundation Repair & Waterproofing
325 Chestnut St Ste 876 #121, Philadelphia, PA 19106, USA
61 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
Philadelphia costs are approximately 4% higher than the national average due to the city's higher cost of living and the prevalence of historic row homes with complex limestone foundations that require specialized mortar repair before waterproofing can begin.
Interior waterproofing services in Philadelphia average around $3,125 and focus on managing water that has already entered. In contrast, extensive exterior services, which involve excavation to prevent water entry, average $7,275 but can exceed $15,000 for complex properties.
The average cost for a professional sump pump installation in Philadelphia ranges from $1,112 to $1,560. However, if your basement has thick concrete floors requiring jackhammering, the price can increase by an additional $2,000 to $5,000.
For a standard 20'x30' basement (100 linear feet), an interior French drain system typically costs between $5,000 and $6,000, averaging roughly $50 to $60 per linear foot for labor and materials.
📊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: 3 weeks 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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