Stewart said the person found on the property suffered serious injuries and was taken to Christchurch Hospital for treatment.
The Herald believes the man suffered a serious gunshot wound to his hand.
"The homeowner was shaken by the incident and is assisting police with their inquiries."
An investigation is under way into the circumstances of the incident.
Anyone who saw anything suspicious in the area overnight, or who has any information which may assist, is asked to contact police by phoning 105, quoting event number P046603045.