The Kelowna Fire Department was called to the fire in the 900 block of Academy Way at about 4 am.
The first officer to arrive activated a sprinkler on the first-floor balcony, which successfully contained the fire.
Furnishings on the balcony were still damaged in the fire, however.
The fire has been deemed accidental.
KFD Platoon Captain John Kelly added: “We would like to remind everyone to fully extinguish smoking material in an appropriate container.”
Firefighters responded with three engines, a ladder truck, rescue unit and command vehicle with 16 crew members.