flies

Lots Of Flies In House Suddenly Uk Winter. The following are affiliate links. Those large flies in your home in winter are probably cluster flies, which overwinter in the protected areas between the inside and outside walls of your home, or in the attic or basement.

Most flies spend the winter season in the cracks and nooks in your house. The source is likely inside your house, garage, attic or garden. House flies can multiply into hundreds within a couple of days in your home.