Basement Waterproofing Cost in San Antonio (2026)
Average cost in San Antonio
US$2,450 — US$15,500
US$5 — US$12 per sq ft
Cost Breakdown
ItemizedSkilled waterproofing technicians and excavation crews
45%
Waterproof membranes, sealants, and vapor barriers
25%
Sump pumps, French drain piping, and basins
15%
Digging through San Antonio caliche and limestone bedrock
10%
City of San Antonio building and trade permit fees
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 Cost
InteractiveEstimated Cost
US$5,632 — US$8,448
Based on 9 sources and market data for San Antonio. Actual costs may vary depending on specific project requirements.
🏢Top Waterproofing Contractors in San Antonio
Verified providersPinnacle Foundation Repair
6910 NE Interstate 410 Loop Suite 113, San Antonio, TX 78219, USA
520 reviews
Baird Foundation Repair
726 Hot Wells Blvd, San Antonio, TX 78223, USA
1,707 reviews
G.L. Hunt Foundation Repair
4827 Whirlwind Dr, San Antonio, TX 78217, USA
2,355 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
San Antonio's expansive clay soil and limestone bedrock (caliche) significantly increase costs. Excavation through caliche can run $50–$100 per square foot, while clay requires specialized drainage solutions to handle high hydrostatic pressure.
The City of San Antonio requires a building permit for foundation work, which typically carries a flat fee of approximately $160. If the project includes a sump pump or electrical work, additional trade permits (plumbing/electrical) costing $55–$64 each are required.
While interior solutions are more affordable (averaging $3,000–$5,000), exterior waterproofing is often recommended for San Antonio's flash-flood-prone climate. Exterior systems, including membranes and French drains, cost $8,000–$15,000 but provide a permanent barrier against groundwater.
A professional sump pump installation in San Antonio typically ranges from $1,200 to $2,500. This includes the basin, the pump unit, and the necessary plumbing to discharge water away from the foundation.
📊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.