Cluster flies are around 10mm in length. They have one set of wings that are transparent, but show a distinct vein pattern. The thorax has distinctive grey/olive coloured stripes and is covered in fine golden hairs. The abdomen is grey in colour and has a chequer-board type pattern. Cluster fly adults often settle in roof voids in order to hibernate. For this reason they are sometimes known as ‘attic flies’. A large number of flies flying around the property, or dead flies on window sills, will be a good indication that a swarm has taken up residence in your property. Cluster flies present no risk to health, but can be a source of nuisance. Their presence should not be taken as a sign of poor hygiene, they are merely seeking a suitably warm place to hibernate. If they are not dealt with, it is not unusual for them to return to the same property every year.


About the treatment

We will attend your premises on the agreed date. Our Pest Control Officer will survey your property and treat as appropriate. An insecticidal spray is misted into the affected area via an ultra low volume machine. Windows are also treated with a water-based residual insecticide. Treatment for flies outside is a waste of time as environmental factors such as wind and rain will render the product useless. Sometimes a follow up visit may be necessary, but this will be arranged on a case by case basis. For further details, please see the About the Service page.


Booking your appointment

Please call 01903 737755 to arrange a pest control appointment. This service is chargeable, please see our Pest Control Fees page for more information. The fee will be payable at the time of booking, so please have your card details ready. We will not usually be able to refund the payment once treatment is underway. If the flies are still present after four weeks, we will return to treat again, but please note an additional fee of £15 will be payable. If the problem reoccurs after this time, this will be dealt with as a new treatment and a further charge will apply.