Basement Waterproofing Cost in San Francisco (2026)
Average cost in San Francisco
$4,500 – $22,000
$6 – $15 per sq ft
In San Francisco, the average is $13,550 and most projects cost between $4,500 and $22,000, or about $6 – $15 per sq ft. Prices are before tax and based on 9 sources.
Cost Breakdown
ItemizedSpecialized waterproofing technicians at ~$200/hr
45%
Membranes, French drains, and sealants
30%
Excavation machinery and debris removal
12%
SF Building Code compliance (6-9% of project)
8%
Unit and seismic-rated installation
5%
Sales Tax at 7.25%
📋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 Francisco
Likely range $6,098 – $22,000
- Labor45%$6,098
- Materials30%$4,065
- Equipment & Disposal12%$1,626
- Permits & Inspections8%$1,084
- Sump Pump System5%$678
Interior sealant
$13,550
Interior drainage / weeping tile
$21,680
Exterior excavation
$32,520
Calibrated to 9 researched sources for San Francisco. Before tax. Real quotes vary with site conditions.
📈Price Momentum
Year-over-year~1 year ago
$12,807
Today
$13,550
Basement Waterproofing in San Francisco is ↑ 5.8% compared to roughly a year ago — about $743 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 Francisco
Verified providersThe Restoration & Waterproofing Co., Inc.
3450 Sacramento St #132, San Francisco, CA 94118, USA
4 reviews
Ultra Construction
180 S Spruce Ave G, South San Francisco, CA 94080, USA
29 reviews
The Golden City Foundation Repair Co
50 Post St #24, San Francisco, CA 94104, USA
9 reviews
Everest Waterproofing & Restoration
1270 Missouri St, San Francisco, CA 94107, USA
9 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
In 2026, San Francisco building permits typically cost between 6% and 9% of the total project valuation. For a standard $13,250 project, homeowners should budget approximately $800 to $1,200 for permit and impact fees.
Yes, properties on steep slopes or with limited access can see a 20% to 30% increase in labor costs. Excavation in tight urban spaces often requires manual labor or specialized mini-excavators, which can add $2,000 to $5,000 to the total.
A professional sump pump installation in San Francisco currently averages between $1,245 and $1,746. This includes the pit excavation, pump setup, and required seismic anchoring to meet local building codes.
Interior systems are more common due to the high cost of exterior excavation in dense SF neighborhoods, costing $3,000 to $8,000. Exterior methods, while more permanent, range from $10,000 to $20,000+ because they require digging down to the foundation footings.
📊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: 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.