A 911 call reported the blaze at 1037 Mahoney Ave. around 1:10 a.m. on May 22, the fire department said in a release.
Smoke and flames coming from an attached deck to the home were quickly put out by firefighters, officials said.
Crews said they searched the bi-level house for further extension of the fire as a precaution and ventilated it for remaining smoke.
Damage is estimated at $10,000.
No injuries were reported.
It was the second fire within a matter of hours in Saskatoon caused by the improper disposal of smoking material.
A fire Tuesday evening on Whelan Crescent caused an estimated $750,000 damage to two homes, officials said.
WATCH BELOW: Saskatoon firefighters respond to 2 fires on Saturday (April 2019)