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Question DetailsAsked on 11/10/2015

Why dies it cost so much to install a French drain?

I need a French drain done in my backyard, where water is standing.

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2 Answers

0
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French drains cost so much because of the large amount of labor involved in doing it. Lots of digging by hand or expensive equipment to do it for them.

Answered 2 years ago by DriverNerd

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Depends on what type and depth, whether it is expensive or not. A simple shallow french drain to eliminate a damp spot or few or a boggy swale can run as cheap as $5-10/LF (just a foot or so burial depth), whereas a french drain along the base of a house foundation can run up to about 5-10 times that much very rough ballpark, putting it in 8-10 feet down.


Ways to cheapen the job -

1) provide easy on-site disposal area for trenched material to eliminate need to haul it away


2) for some cases of simple damp spot elimination out in the yard, sometimes a drain pipe is not needed - just drain rock wrapped in filter fabric and structural geotextile will do the job - basically a "sausage drain" winding through the wet spots at a suitable trench bottom slope and existing to a free drainage outlet.


3) commonly, unless the house is down in a hollow, excavated swales or swales combined with berming using the excavated materials can be the cheapest and also the most maintenance free - providing a drainage path to remove the surface water, and using the berming (or terracing) both to dispose of excavated materials produced in building the swale, and also to contain the water so the swale does not have to be so deep, thereby reducing your excavation quantities (and cost).


Cost can also relate to the vendor you use - while a Basement Waterproofing contractor is probably your best beat for a foundation drainage drain, an out-in-the-yard drain might be cheaper done by a Landscaping contractor, or if doing the rehab and replanting yourself, a small Excavation contractor can frequently be cheapest. There can easily be a 2:1 or even 3:1 relative difference in their general costs for such work.

Answered 2 years ago by LCD




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