Police are on the hunt for those responsible for an elaborate cannabis crop set-up inside an unoccupied house near Gawler.

Detectives discovered the large haul of more than 200 cannabis plants in a house on River View Dr, Hewett, at 9am on Monday.

The house, which had significant electrical modifications made, was believed to have been used solely to grow cannabis. No one was at the house at the time.

Police seized the plants in different stages of maturity growing in seven rooms inside the home.

Lights, transformers and carbon filters used in the cultivation of the cannabis were also seized.