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Cluster flies like to just be there - they hibernate inside in winter.
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Could be cluster flies, but unusual for them to come out now although if the heating is on I guess it can confuse things. They usually stay put when it’s proper cold. Autumn/spring is when they appear.
We had shit loads come out of veluxs in September. First sept in this place so hoping it’s not an annual thing!!
Doubt it’s drains. More likely vents, soffits, cracks around windows etc.
NotThamesWater
andos
@rogan
what are the likely causes of flies..? not fruit flies, big annoying flies.
this week we’re finding multiple flies a day inside, no windows are open, its freezing..
tried sniffing around every room and i cant find anything that appears to be rotting, bins are kept in the garage
.. my first thought is drains?