How Do Bugs Get In the House? 5 Common Problems and Solutions

Bug them back by keeping them out

A living room window showing greenery outside.
Photo: Catherine Falls Commercial / Moment / Getty Images
A living room window showing greenery outside.
Photo: Catherine Falls Commercial / Moment / Getty Images
Highlights

  • Pest control services cost between $108 and $261 on average.

  • Bugs use intentional and unintentional openings to get into the house.

  • Professional pest control methods include eradication and prevention.

  • You can reduce the likelihood of bugs coming in, but you can't stop them completely.

Get quotes from up to 3 pros!
Enter a zip below and get matched to top-rated pros near you.
Geo Icon

If you're wondering how bugs get in your house even after you've done everything to keep bugs out, you're not alone. Bugs can make their way into your home through the tiniest openings, which our houses are full of. Here's where they get in and how to limit their ability to wiggle their way inside your cozy space.

1. Door and Windows

An open door with windows.
Photo: Catherine Falls Commercial / Moment / Getty Images

The most common way pests get into our homes is through poorly sealed windows and doors or other gaps in these structures. A simple loose or uncaulked piece of trim work or a missing piece of sealant is enough to allow a whole host of tiny critters into our dwellings. 

The Solution

Inspecting and sealing your windows and doors is an excellent weekend DIY project. While you're not likely to catch every single tiny opening, a bead of caulk around your home's most prominent penetrations can go a long way toward stopping the invasion. 

2. Penetrations

Our houses operate using various transfer methods of water, electricity, and venting. While installers and technicians carefully seal the numerous penetrations through our house walls during whatever installation takes place, the sealants used can quickly deteriorate. Sealant deterioration leaves behind cracks and holes that can become a bug highway to our living room. 

The Solution

One common entry point for utilities and bugs is our crawl spaces and basements. Crawl space encapsulation can help severely limit the ability of bugs to enter our homes. Another solution is to add penetration inspection and repair to your list when checking your windows and doors. 

3. Designated Openings

Unbelievable but true, our houses have numerous openings directly to the outdoors, on purpose. Soffit vents, exhaust vents, chimneys, fireplaces, and fresh air intakes all offer a wide-open door policy to bugs. 

The Solution

One of the things that makes professional pest control worth it is the technical approach to keeping bugs out despite the vast number of easy entry points. A pest control specialist can offer solutions for adding screening where possible and practical or setting up chemical and other barriers to limit the ability of bugs to get into your house.  

4. Gaps

Building a house means fitting hundreds or thousands of material pieces together. With that many puzzle pieces to fit together, there are inevitably going to be a number of gaps between them. These gaps are normal, and not all of them are sealable at a practical level. Additionally, gaps large enough to allow bugs to enter your home can appear and disappear through expansion and contraction as the temperature changes. 

The Solution

While there's nothing we can do about most of these tiny gaps and cracks, you can employ your pest control specialist to set up perimeter barriers around vulnerable areas to reduce congestion on the buggy road to the inside of your home. 

5. Damaged Areas

House damage that attracts pests is not uncommon. Storm damage, plumbing leaks or damage, wood rot, and several other circumstances can leave your home vulnerable to bug invasion while offering them the dampness they like and a safe place to hang out. 

The Solution

If your home suffers damage and water is involved, bugs often follow along. Repair the damage as soon as possible to minimize your exposure, and consider installing a dehumidifier or other solution to reduce the presence of bug-inviting moisture. 

When to Call a Pro

There are many ways to attack your home's bug problem using DIY methods, which are readily available at hardware stores and home centers. However, the best steps for keeping your home pest-free involve a mix of DIY and professional solutions.

Many homeowners choose the option with the best results by hiring a local pest control expert. Professional pest control costs between $108 and $261 per visit on average, and the service usually comes with a guarantee of one sort or another.

Frequently Asked Questions

Having bugs in our houses is quite normal. However, if you notice a sudden uptick in quantity, there's often a reason behind it. Seasonal weather changes, particularly warm to cool, drive bugs indoors as they look for comfort. Structural damage to your home can open up new ways for them to get in, and a new water leak somewhere in the house can invite them to get comfortable.

Most bugs that get into and reside inside our homes are harmless. However, you should address the presence of harmful ones, such as bed bugs, roaches, or termites, that can harm you and your home. Additionally, if you notice a significant increase in bug sightings of any kind, it's a good time to perform a home inspection, looking for water or structural damage that could be inviting them in. 

Need professional help with your project?
Get quotes from top-rated pros.
The homeowners guide to pest control services
From average costs to expert advice, get all the answers you need to get your job done.
worker in white protective suit spraying pest repellant on window sill
May 12, 2025
May 12, 2025
Whether you have bugs, bats, or rodents invading your home, you’ll want to contact an exterminator quickly. Find out how much pest control costs.
The interior of an eclectic dining room on a sunny day
May 9, 2025
May 9, 2025
If you have a serious rodent problem, you may need to know the cost of hiring a rat exterminator. We can help you estimate prices and control costs.
Close-up of termites on a wooden surface
May 9, 2025
May 9, 2025
Keep your home free of termites and the damage they do. Learn more about inspections, infestations, and the average cost of termite treatments.
Spraying disinfectant on surface
May 12, 2025
May 12, 2025
Bed bugs are tricky to eradicate, but certain substances can kill them on contact. Find out what kills bed bugs instantly and when to call in a pro.
close up of dead roach
May 12, 2025
May 12, 2025
It’s always better to call an exterminator sooner rather than later if you suspect a roach infestation. Follow this guide for telltale roach signs and next steps.
Dead cockroach on a kitchen bench
May 12, 2025
May 12, 2025
Cockroaches are drawn to the warmth and darkness provided by appliances. To prevent an infestation, learn how to get roaches out of appliances for good.