Why Is There So Many Flies In My House? The Ultimate Guide        

Why Is There So Many Flies In My House

Having an abundance of flies in your house can be a frustrating and unsightly problem that many homeowners encounter at some point. The incessant buzzing, unsanitary implications, and potential health hazards associated with these winged pests can make your home far from comfortable. But why do flies seem to invade our living spaces, and when do they become most problematic? In this article, we will delve into the reasons behind the presence of these pesky insects, explore the conditions that make them more prevalent, and provide practical insights into how you can effectively address and prevent fly infestations. Discover the why, when, and how of dealing with the age-old question: “Why are there so many flies in my house?”

Why Is There So Many Flies In My House? 

The presence of a large number of flies in your house can be attributed to several factors, and understanding these reasons is crucial for effective fly control. Here are some common reasons why flies may infest your home:

  • Food Sources: Flies are attracted to food, especially decaying or fermenting substances. Leftover food crumbs, open trash cans, unwashed dishes, and spilled beverages can all serve as food sources for flies.
  • Warmth And Shelter: During the colder months, flies seek warmth and shelter, often finding their way indoors through gaps, cracks, or open doors and windows. They are also drawn to areas with favorable temperatures.
  • Moisture: Flies require water for survival, and they are attracted to areas with high humidity or moisture content. Leaking pipes, damp areas, or even overwatered plants can provide the necessary moisture.
  • Breeding Sites: Flies reproduce rapidly, and they lay eggs in decaying organic matter. Rotting fruits and vegetables, pet waste, and compost piles can become breeding grounds for flies.
  • Outdoor Conditions: Environmental factors can play a role in the influx of flies. Seasonal changes, such as the arrival of spring, can lead to increased fly activity as they become more active.
  • Proximity To Farms Or Livestock: If you live near agricultural areas or livestock farms, flies can be more common due to their attraction to animal waste and feed.
  • Poor Pest Control: Inadequate pest control measures can allow fly populations to grow unchecked. If you don’t take steps to deter or eliminate flies, their numbers can increase rapidly.
  • Neighboring Infestations: Flies can migrate from neighboring properties or areas with existing fly infestations. They may be attracted to your home if it provides better conditions for them.

When Flies Are Most Common In Houses?

Flies can become more common in houses during specific times or under certain conditions. Understanding when flies tend to be most prevalent indoors can help you take proactive measures to prevent and control infestations. Here are some key times and conditions when flies are commonly found in houses:

  1. Warmer Seasons: Flies are typically more active and abundant during the warmer months, such as spring and summer. The higher temperatures encourage their breeding and activity.
  2. Late Summer And Early Fall: Late summer and early fall are peak fly seasons. Flies may enter homes seeking shelter from changing weather conditions or as they prepare for the winter.
  3. After Rain Or Moisture: Following periods of rain or high humidity, flies may be more active indoors, attracted to the moisture and the potential breeding sites it creates.
  4. Open Doors And Windows: Flies can easily enter homes through open doors and windows. They are more likely to come inside when doors and windows are left ajar or without screens.
  5. Food Preparation: When food is being prepared or left uncovered, flies are drawn to the scent and may enter the kitchen or dining areas in search of a meal.
  6. Unsanitary Conditions: Homes with poor sanitation, such as dirty dishes, unemptied trash cans, or pet waste left unattended, are more likely to attract flies.
  7. Proximity To Outdoor Breeding Sites: If your home is near areas with potential fly breeding sites, such as garbage dumps, compost heaps, or agricultural fields, you may experience more fly intrusion.
  8. Indoor Plants: Overwatering indoor plants can create moisture-rich environments that attract flies, especially fungus gnats.
  9. Pet Waste: Pet owners may notice an increase in flies around areas where pet waste is not promptly cleaned up.
  10. Damaged Screens Or Seals: Flies can enter through damaged window screens, gaps in doors, or other openings that connect the indoor and outdoor environments.

How To Keep Flies Out?

Keeping flies out of your home involves a combination of preventive measures and creating an environment that is less attractive to these pests. Here are some effective ways to keep flies out of your house:

Install Window And Door Screens: Ensure that all windows and doors have tight-fitting screens to prevent flies from entering your home while allowing fresh air to flow in.

Seal Cracks And Gaps: Inspect your home for any cracks or gaps in walls, doors, windows, and foundations, and seal them with caulk or weatherstripping.

Use Weatherstripping On Doors: Apply weatherstripping to the bottom of exterior doors to create a tight seal and prevent flies from slipping through the gaps.

Close Doors And Windows: Keep doors and windows closed when not in use, especially during peak fly seasons or when cooking.

Use Fly Screens For Ventilation: Consider using fly screens or mesh coverings over vents and chimneys to prevent flies from entering through these openings.

Keep Food And Trash Secure: Store food in airtight containers to prevent odors from attracting flies. Empty trash cans regularly and keep them sealed with lids.

Clean Up Pet Waste: Promptly clean up after pets to eliminate potential fly breeding sites in the yard.

Maintain Good Hygiene: Practice good personal and kitchen hygiene to prevent flies from being attracted to food and waste.

Fix Leaks And Damp Areas: Repair any leaking pipes or faucets to eliminate sources of moisture that attract flies.

Use Fly Traps: Employ fly traps or sticky flypaper in areas where flies are a recurring problem. These traps can help reduce fly populations.

Remove Rotting Organic Matter: Regularly inspect and clean areas where organic matter may decay, such as fruit baskets, compost bins, and drains.

Manage Indoor Plants: Avoid overwatering indoor plants, as excess moisture can attract flies. Use well-draining soil and pots with saucers to catch excess water.

Use Natural Deterrents: Consider using natural fly deterrents like essential oils (e.g., lavender, eucalyptus) or herbs (e.g., basil, mint) to repel flies.

Maintain Outdoor Hygiene: Keep outdoor areas clean and free from debris, as unattended outdoor areas can be breeding grounds for flies.

Regular Cleaning: Frequently clean your home, especially the kitchen, to remove food residues and crumbs that attract flies.

What To Expect From Pest Control Services?

When you hire pest control services to address a fly infestation or any other pest problem in your home, it’s essential to know what to expect from the service provider. Here’s a general overview of what you can anticipate when you engage the services of a professional pest control company:

Initial Inspection:

The pest control technician will begin by conducting a thorough inspection of your property to assess the extent of the fly infestation and identify potential entry points and breeding sites.

Identification Of Pest Species:

The technician will determine the specific type of flies causing the issue, as different fly species may require different control methods.

Customized Treatment Plan:

Based on the inspection findings, the pest control provider will develop a customized treatment plan tailored to your specific situation and the type of flies involved.

Explanation Of Treatment Options:

The technician will explain the proposed treatment methods, including any chemicals or traps to be used, and discuss the potential risks and safety precautions.

Safety Measures:

Pest control professionals prioritize safety. They will provide guidelines on how to prepare your home, remove pets, and ensure the safety of occupants during and after the treatment.


In conclusion, dealing with a fly infestation in your home can be both frustrating and unhygienic. Understanding why flies are attracted to your house, when they are most common, and how to keep them at bay is crucial. By implementing preventive measures, maintaining good sanitation practices, and, if necessary, seeking professional pest control services, you can create a more comfortable and fly-free living environment. Remember that a proactive approach to fly control is key to ensuring a healthier and more enjoyable home for you and your family.


Q: Why Are There So Many Flies In My House?

A: Flies are attracted to food, moisture, warmth, and open entry points in your home.

Q: When Are Flies Most Common Indoors?

A: Flies are more prevalent indoors during warmer seasons, late summer, and early fall.

Q: How Can I Keep Flies Out Of My Home?

A: Seal gaps, use screens, maintain cleanliness, and consider natural deterrents or professional pest control.

Q: Are Flies A Health Concern?

A: Yes, flies can transmit diseases and carry harmful bacteria, making them a potential health risk.

Q: What Should I Expect From Pest Control Services For Flies?

A: Pest control services will inspect, customize a treatment plan, apply treatments, provide safety guidelines, and offer preventive recommendations.

Frances Umstead

Frances Umstead is a health & fitness writer with a passion for helping others reach their fitness goals. She has been featured in magazines and online publications such as Shape, Self, Huffington Post, and more. When she's not sweating it out at the gym or writing about health & fitness, Frances can be found reading a good book or spending time with her husband and pup.

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