Please note that we can only deal with issues resulting from Industrial, Trade and Business Premises.
Local Authorities now have a duty to take reasonable steps to investigate any complaints of insect nuisance. There is no exact definition to the number of insects required to constitute a nuisance. However, the Department for Environment Food and Rural Affairs has published guidance.
Guidance states in domestic premises, "an occupier will normally experience some irritation if there are five or more flying insects present in any one room at any one time on three successive days". This does not mean this level will necessary constitute a nuisance but it can be considered the lowest threshold worthy of further investigation.