West Shore RCMP responded to a call at around 8:30 p.m. to a residence in the southern Vancouver Island city.
They found a man with gunshot wounds inside the home, which is on Sooke Road near Anders Road.
The man was transported to hospital where he remains in serious condition.
Mounties say the reason the man was in the residence is unknown at this time.
Investigators are looking to speak with anyone who has information on the incident.