Professional Cluster Fly Removal – Nex Pest Control
What Are Cluster Flies?
Cluster flies are slightly larger and slower moving than common house flies. They are grey in colour with faint golden hairs on their thorax.
Unlike house flies, cluster flies are not attracted to food waste. Instead, they are parasites of earthworms and typically enter buildings during late summer and autumn looking for sheltered places to hibernate.
Once inside lofts, wall cavities and window frames, they gather in large groups – which is why they are called “cluster” flies.
When temperatures warm during winter or early spring, they often emerge suddenly and gather around windows trying to escape.
Signs You May Have a Cluster Fly Infestation
Most homeowners first notice cluster flies when large numbers appear indoors. Common signs include:
• Large numbers of slow-moving flies around windows
• Flies appearing during sunny winter days
• Flies gathering in loft spaces or roof voids
• Buzzing flies around light fittings or window frames
• Dead flies accumulating on window sills
Cluster flies are not generally associated with disease like house flies, but large infestations can become unpleasant and difficult to manage without professional treatment.
Why Cluster Flies Enter Homes
Cluster flies typically enter properties during late summer and autumn as they search for warm, sheltered areas to overwinter.
Common entry points include:
• Gaps around window frames
• Roof vents and soffits
• Loft spaces and roof tiles
• Wall cavities and fascia boards
• Small cracks in brickwork or cladding
Once inside, they remain dormant until warmer temperatures trigger activity.
Without treatment, the same property can experience recurring infestations every year.
Professional Cluster Fly Treatment
At Nex Pest Control, we use targeted professional treatments designed to eliminate cluster fly infestations safely and effectively.
Our cluster fly control service typically includes:
Inspection
We identify harbourage areas such as lofts, roof voids and window cavities where flies gather.
Professional Treatment
Specialist insecticidal treatments are applied to eliminate active flies and reduce further activity.
Prevention Advice
We advise on preventative measures to help avoid cluster flies returning in future seasons.
Treatments are carried out safely and discreetly with minimal disruption to your property.
Why Cluster Fly Problems Return Each Year
Cluster flies are well known for returning to the same buildings year after year to hibernate. Once a property has been identified as a suitable shelter — typically warm loft spaces, wall voids, and upper floor cavities — it can become an established overwintering site.
A key reason infestations recur is due to aggregation pheromones released by the flies. When cluster flies gather to overwinter, they emit chemical signals that attract other flies to the same location. These pheromones can remain present in the area, encouraging additional flies to return to the property in subsequent seasons. Over time, this can lead to large numbers of flies accumulating in the same building each autumn.
Because of this behaviour, properties that have experienced a cluster fly infestation once are more likely to experience repeat problems if the issue is not properly managed.
Professional pest control treatment targets both the active flies and the harbourage areas where they gather.
Cluster Fly Control for Homes and Businesses
Cluster flies can affect a wide range of properties including:
Homes and flats
Offices and workplaces
Schools and care homes
Restaurants and commercial premises
Warehouses and industrial buildings
Nex Pest Control provides reliable pest control services for both residential and commercial customers across Hertfordshire.
Cluster Fly Control in Stevenage, Hitchin, Letchworth and Welwyn
Nex Pest Control is a trusted local pest control provider covering:
Stevenage
Hitchin
Letchworth Garden City
Welwyn Garden City
Surrounding villages across Hertfordshire
Our local knowledge allows us to respond quickly to cluster fly infestations in the area.
Why Choose Nex Pest Control?
Choosing a professional pest control company ensures cluster fly infestations are dealt with effectively.
With Nex Pest Control you can expect:
Fast local response
Professional pest control treatments
Discreet and reliable service
Experienced pest control technicians
Clear advice to prevent future infestations
Our goal is to resolve your pest problem quickly while giving you peace of mind.
Contact Nex Pest Control Today
If cluster flies are appearing in your home or business, early treatment can prevent the infestation worsening.
Contact Nex Pest Control today on 01438 870688 for professional cluster fly control in Hertfordshire.
Call us today to arrange an inspection and treatment.
Alternatively, send us a message through our website and we will respond as soon as possible.
Call or Message Us
If you need urgent cluster fly pest control, the fastest way to reach us is by phone or WhatsApp.
📞 Call Us
01438 870688 – Stevenage Office
01462 374030 – Hitchin Office
Client Reviews & Feedback
We are a small family run business of dedicated Pest Controllers that take great pride in our work.
Where we work
- Stevenage
- Hitchin
- Letchworth
- Baldock
- Welwyn Garden city
- Ware
- Hertford
Where we work (Bird control)
- Hertfordshire
- Bedfordshire
- Cambridgeshire
- Essex
- Buckinghamshire
- Northamptonshire
- Peterborough
- Greater London
- Kent
