cost to install french drain
- Typical costs: Having a landscaper or other professional install outdoor French drains can cost $10-$30 a linear foot but averages about $25/foot depending on depth and width (typically 12-24 deep and 6-18 wide), and local rates. A French drain 30'-50' long might cost $300-$1,500, with prices averaging about $750-$1,250. For example, Galtech.com reports having two French drains installed at an Oregon home for $1,475 for 58' total, about $25-$26 a foot.