French Drain
A gravel-filled trench with perforated pipe that collects groundwater and directs it away from the foundation by gravity.
Quick answer
French Drain: A gravel-filled trench with perforated pipe that collects groundwater and directs it away from the foundation by gravity. Typical cost: $25–$60 per linear foot installed; $3,000–$9,000 for a typical perimeter run..
Why it matters
French drains solve perimeter water problems before they reach the basement. Cheaper than waterproofing membranes and more permanent than sump pumps alone.
Typical cost
$25–$60 per linear foot installed; $3,000–$9,000 for a typical perimeter run.
Pros
- • Permanent — no power required
- • Lower long-term cost than sumps alone
- • Pairs with downspout extensions
Cons
- • Requires gravity discharge or daylight outlet
- • Disturbs landscaping
- • Not a substitute for major foundation waterproofing
Common uses
- • Yards with poor drainage
- • Below-grade basement walls
- • Sloped lots
Alternatives
Sump pump + interior drainExterior waterproofing membraneRegrading
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Related questions
Frequently asked questions
- Does insurance cover French drain installation?
- Almost never — drainage is considered maintenance, not sudden damage. Plan to self-fund.
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Estimates and guidance are educational. Always confirm with a licensed local professional before making decisions.