Pest Effects wrote:

Mike Wrote:

How large are they? If you live near a chicken shed, they could be
lesser house flies.

Not so big, about 5mm or so in length. Brown-black in colour. I don't
think I live near a chicken shed. Someone mentioned in the office that
I could have a look in my gutters to make sure they are clear. It was
said that eggs can be laid there and when they hatch the flies just
congregate between the ground floor and second floor.

Cheers,

Mike