Investigators say a discarded cigarette is to blame for a fire that destroyed a home in the Bearspaw community west of Calgary.

The home was under construction in the subdivision of Watermark when it caught fire last Friday morning.

The fire engulfed the large home located on 12 Mile Coulee Road north of 80th Avenue N.W.

No one was injured but the owners of the $2-million home were expecting to move in within weeks.