The answer to 'drainage system installation cost' is that the cost can vary widely depending on several factors. Typical ranges for a professional drainage system installation can be anywhere from a few hundred dollars for a small project up to several thousand for a more complex system.
The main factors that influence the cost include the size of the area that needs drainage, the type of drainage system (e.g. surface drainage, underground pipes, French drains), the complexity of the installation, and the labor and material costs in your local area. Getting quotes from multiple local landscaping professionals is essential to understanding the typical cost range for your specific project.