French Drain Cost

French Drain CostThe cost of a french drain can vary based upon a variety of factors including:

  • What is the purpose of the french drain? Is this french drain going to be used to divert surface water away from a driveway or garden? That type of drain will not need to be dug as deep. Or will this french drain need to be installed deeper as it would be for the purposes of basement waterproofing? Depending on your answer, this can affect the price.
  • Is this for new construction or for an existing home? If you are installing your french drain at the same time your home is being built, the cost will be MUCH lower. However if you are installing a french drain to an already finished home the cost will be higher due to all the extra work needed to dig up earth and/or foundation as well as moving away anything that may be in the way (ie. landscaping, patios, decks, etc..)

Exterior French Drain Cost: With those questions in mind, the average cost to install an exterior french drain around a 1,500 square foot basement will be approximately $10,000 – $14,000.

Interior French Drain Cost: The average cost to install an interior french drain which catch water as it comes in to your basement is cheaper than an exterior drain but still around $3,000 – $5,000 depending on the size of your basement.

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