If installed properly by a qualified plumber, a French drain can last for a very long time. In some circumstances, shallow French drains can be easy to install as a DIY project.

How much does it cost to put in French drains?

According to Fixr, the average French drain costs $4,500. An exterior drain located fairly close to the surface could cost as little as $1,000, or $25 per linear foot on average. Drains installed under your basement floor could cost $2,000 or more. Expect to pay $60 to $70 per linear foot for installation.

Why are French drains bad?

The Importance of a Properly Installed French Drain Poor installation can lead to pooling in the drain system. In turn, the pooling can cause major issues and problems. … Resultantly, it takes more energy for water to move through the system. It cannot remove subsurface water properly for this reason.