Basement Waterproofing Cost in San Antonio (2026)
Average cost in San Antonio
$2,000 – $8,500
$4 – $13 per sq ft
In San Antonio, the average is $5,660 and most projects cost between $2,000 and $8,500, or about $4 – $13 per sq ft. Prices are before tax and based on 12 sources.
Cost Breakdown
ItemizedSkilled installation and excavation
45%
Membranes, sealants, and vapor barriers
25%
Sump pumps and French drain piping
20%
Excavator rental and debris removal
5%
City filing and trade inspections
5%
Sales Tax at 6.25%
📋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 San Antonio
Likely range $2,547 – $8,500
- Labor45%$2,547
- Materials25%$1,415
- Drainage Hardware20%$1,132
- Equipment & Disposal5%$283
- Permits & Fees5%$283
Interior sealant
$5,660
Interior drainage / weeping tile
$9,056
Exterior excavation
$13,584
Calibrated to 12 researched sources for San Antonio. Before tax. Real quotes vary with site conditions.
📈Price Momentum
Year-over-year~1 year ago
$5,380
Today
$5,660
Basement Waterproofing in San Antonio is ↑ 5.2% compared to roughly a year ago — about $280 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 San Antonio
Verified providersPinnacle Foundation Repair
6910 NE Interstate 410 Loop Ste 113, San Antonio, TX 78219, USA
624 reviews
Baird Foundation Repair
726 Hot Wells Blvd, San Antonio, TX 78223, USA
1,886 reviews
G.L. Hunt Foundation Repair
4827 Whirlwind Dr, San Antonio, TX 78217, USA
2,402 reviews
Xpert Foundation Repair
2523 Nacogdoches Rd, San Antonio, TX 78217, USA
126 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. San Antonio's expansive clay and caliche soil can increase costs by 15-20% because they exert higher hydrostatic pressure on walls and make excavation significantly more difficult, often requiring specialized digging equipment.
Simple interior sealing typically does not require a permit. However, if the project involves foundation repair or new plumbing for a sump pump, the City of San Antonio requires a foundation permit (approx. $160 flat fee) and potentially a plumbing trade permit starting at $64.
Interior solutions like sealants and drains average $3,000 to $5,000. Exterior waterproofing, which involves excavating the foundation perimeter, is much more expensive, typically ranging from $8,000 to $15,000+ due to the labor-intensive nature of digging in Texas limestone.
In San Antonio, a professional sump pump installation typically costs between $1,200 and $2,500, depending on the pump's horsepower and whether a new discharge line must be trenched to the exterior.
📊Our Methodology
How we collect dataAggregated from 12+ 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.