The collapse at 2367 Basswood St. was reported at 3:23 a.m.
Margaret Scott, 81, and Carla Scott, were trapped in the collapse and had to be extricated by Georgetown Township firefighters, Koster said.
The rescue occurred without incident.
The women were in a corner of the house where the roof stayed intact, officials said. If they had been in another room, they may have been seriously hurt.
The roof collapsed due to the age of the home with the amount of snow and ice piled on top of it, according to Georgetown Township Fire Chief Dan Hamming.
This is the first house collapse Hamming said he’s responded to in several years, and worries there will be at least a couple more before winter is over.
Hamming advises people to look at their roofs. Scrape off some of the snow and ice, and pay close attention to any sagging or leaking in the ceiling.
Life Ambulance transported the women to Spectrum Butterworth Hospital in Grand Rapids.
WZZM-TV contributed to this story.