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How Much Does French Drain Cost? (2026 Guide)

Exterior: $3K–$8K. Interior: $2K–$6K. $20–$60 per linear foot.

Updated Mar 2026Home & Energy$3K–$6K
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French Drain Costs

TypeCostDetails
Exterior french drain (per linear ft)$20–$40Along foundation
Interior french drain$40–$70/ftBasement waterproofing
Yard french drain$10–$25/ftRedirects surface water
French drain + sump pump$5,000–$12,000Full basement system
Curtain drain$10–$20/ftShallow, surface water
How Costs Compare
88%
Exterior french drain (pe 3%
Interior french drain 3%
Yard french drain 3%
French drain + sump pump 88%
Curtain drain 3%

Pro Tips

French drains are the most effective drainage solution — They intercept underground water flow and redirect it away from your foundation. No other drainage method handles subsurface water as well
Interior french drains are for existing water problems — If your basement already floods, an interior drain + sump pump ($5,000-$12,000) is the proven fix. Exterior drains prevent future problems
DIY yard french drains save 50-70% — For surface water drainage in your yard, a 50-foot DIY french drain costs $300-$500 vs $1,000-$2,000 professionally installed. Rent a trencher for $200/day
Use filter fabric around the pipe — always — Landscape fabric prevents sediment from clogging the gravel and pipe. Without it, your french drain fails within 3-5 years. With it: 20-30 years
Slope matters — minimum 1% grade — The trench must slope at least 1 inch per 8 feet toward the outlet. Use a level and string line. No slope = standing water in the pipe = failure
Don't drain toward your neighbor — French drain discharge must go to a proper outlet — not onto your neighbor's property, which creates liability. Drain to a storm drain, dry well, or daylight outlet

What You Need to Know

French drains solve the most common homeowner drainage problems: wet basements, standing water in yards, and foundation water damage. They work by creating an underground channel of gravel and perforated pipe that intercepts and redirects water before it causes damage. Interior french drains paired with a sump pump are the gold standard for basement waterproofing.

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Frequently Asked Questions

How much does french drain cost?▼
See the cost table above for detailed pricing by type. Get 3+ quotes from local contractors for accurate pricing in your area.
Should I DIY or hire a pro?▼
Simple projects (under $1,000) are often DIY-friendly. Complex work involving electrical, plumbing, or structural changes should be done by licensed professionals.
Do I need a permit?▼
Most permanent structures and systems require permits. Check with your local building department before starting. Unpermitted work creates problems at resale.
How long does the project take?▼
Timeline varies by project scope — see the cost table for typical timelines by type. Add 2-4 weeks for permit approval in most jurisdictions.
Is this a good investment for resale?▼
Most home improvements return 50-80% at resale. Energy efficiency upgrades (HVAC, insulation) have the highest ROI due to lower operating costs. Cosmetic improvements are more location-dependent.
When is the best time to do this project?▼
Fall and winter are cheapest for most contractors (10-20% savings). Spring and summer have the longest wait times and highest prices.
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📊 Data Sources
Pricing from provider surveys, RealSelf, and industry reports. Updated March 2026.