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Flies in Your Roof Lantern: Causes and Solutions

skylight on roof with blue sky in background

Installing a new roof lantern can provide your room with a beautiful, cost-effective lighting solution that is sure to impress your family and friends. But your new roof lantern could also attract the attention of a particular type of unwanted guest – flies.

Unfortunately, flies are an inevitable problem in most homes – particularly in the summer months – but understanding the reasons why flies can congregate in your roof light will help you prevent this common issue.

There is a common misconception that flies actively seek out people’s homes for shelter or food, and furthermore, gather around windows in an attempt to escape to the outside world. However, flies do not possess the intellectual capacity to understand the concept of inside or outside, and are instead likely to enter your home because they are attracted to the smell of food, or simply ride in on air currents caused by opening and closing doors.

Why Are There Flies in My Skylight?

Once they have entered your home you may notice that your windows, skylight, or roof lantern seem to attract flies. There are two main reasons your roof lantern or window can attract flies:


Flies tend to enjoy warm weather, being most active around when temperatures are between 29 to 35 degrees celsius – although this can be as little as 15 degrees. Windows and windowsills are often a great space for flies to keep warm as the sun enters your home.


Flies do not see objects and their surroundings in the same way as humans. A fly’s compound eyes detect lights and edges more accurately than our own, meaning that any flies in your window are likely congregating because of the sun’s light.

How to Stop Flies in Roof Lanterns

If you have roof lantern fly problems, there are a number of easy solutions to save your windows from unwanted guests. The most common methods are as follows:

  1. Bug Zappers: Light traps and bug zappers are one of the most effective methods to prevent flies in your roof lantern. Much in the same way that flies are attracted to the sun’s UV rays, light traps emit UV rays that attract insects, causing them to become trapped and electrocuted when they get too close – this also makes disposing of dead flies easier.
  2. Fly Paper: Fly paper is also a great method of preventing unwanted flies. They feature bright yellow colours and a sweet smelling coating that attracts flies. The coating also acts as a glue, which traps and poisons the flies.
  3. Fly Spray: Fly spray features a similar toxin to that contained in fly paper, but does not require you to wait for flies to become trapped, as you can simply spray in the general direction of the offending insects to kill them fairly quickly.
  4. Fly Swatter: Fly swatters are the obvious choice, a quick whip-crack from a plastic fly swatter is enough to kill any fly in a split-second.
  5. Hang Nets: Installing a hang net or screen in front of your window will discourage flies from congregating. 
  6. Clean: Keeping your house clean will mean there is less reason for a fly to enter. For instance, flies often find their way into people’s homes because of the smell of food scraps, or pet waste.

What Roof Lanterns do We Sell?

We sell a range of roof lanterns, including:

We also stock an impressive range of rooflights and skylights, including:

More helpful blogs


Why is my conservatory always full of flies?

No one wants a conservatory full of flies. If you’re having this issue, there are several potential reasons why this might be happening:

  • Open doors and window that flies can pass through.
  • Poorly sealed gaps and cracks
  • Food sources, for instance, uncovered food and drinks.
  • Plants and flowers, as flies may be attracted to their nectar and fragrances.
  • Moisture and humidity, as flies thrive in moist environments.
  • Stagnant water, like that found in plant sources or containers – this can become a breeding ground for flies.
  • Decaying organic matter, such as fallen leaves or dead insects.

How do you get rid of a fly infestation? 

Getting rid of a fly infestation requires a systematic approach to eliminate both adult flies and their breeding sites. Here’s a step-by-step guide to help you tackle the problem:

  • Identify the source or primary breeding ground of the flies.
  • Clean and declutter the whole space.
  • Inspect your home for gaps, cracks, and holes and seal any potential entry points.
  • Use fly traps and fly paper in areas where you see flies.
  • Use natural repellents like eucalyptus, lavender and peppermint.
  • Manually remove flies with swatters and zappers.
  • Remove breeding sites and stagnant water, and ensure proper draining throughout your space.
  • Use fly baits.
  • Call in professional pest control if necessary.
  • Take preventative measures, like regular cleaning and checking for breeding sites.

Does citronella deter flies?

Citronella is known for its ability to repel mosquitoes, but it is not as effective in deterring flies. 

Based on 210 reviews
Bob toploft
Bob toploft
I am the owner of Top loft company ltd, after reviewing reviews from various companies I ordered 2 juliet balconies from tgs arrived within 3 weeks, comunications and help was brilliant. Thanks for all your help.
Jim H
Jim H
Great service from the team. Easy to order, good buying guidance and clear install instructions for my builder. Rooflights look absolutely great! The team at TGS couldn't have been more helpful in organising a smaller delivery vehicle to help with restricted access. Highly recommend TGS.
Jack Smith
Jack Smith
Great service from a very knowledgeable company. Thanks team Toughened Glass Systems.
Paul Smith
Paul Smith
I was spending a lot of money on several rooflights so I wanted to make sure I got it right and I did. The professionalism, expertise and the quality of the roof lanterns really set Toughened Glass Systems apart.
Tyrone Eldridge
Tyrone Eldridge
There are no complaints about the experience with TGS. The entire process of ordering, supplying and delivering was flawless. I would really recommend you order your flat roof sky lanterns from these guys.
Robert Childers
Robert Childers
Best place for rooflights, they supply many different types and options. Thanks for all your support Toughened Glass Systems!
John Smith
John Smith
The glass balustrade gives us an amazing view onto the lake outside. So happy we ended up going for the frameless glass balcony from Toughened Glass Systems instead of one with posts
Louise Newsome
Louise Newsome
My job is to design the interiors for a lot of houses and a lot of times the hardest part was when the client wanted some really inexpensive rooflights that should look like some contemporary ones as well. That until I found Toughened Glass Systems and started working with them more and more. They have a lot of this kind of stuff at a very decent price, a price for anyone I can say. If you’re looking for cheap skylights for flat roofs or any types of roof lights, they probably have something for you.
Krystina Taylor
Krystina Taylor
Always kept us up to date with our order even when delayed by a few days. Great service from the start and good quality glass balcony delivered.