How to Test for Mold in a House

Certified Home Inspector in Sarasota, FL | Peace Of Mind Home Inspections

Everyone is aware of how mold is a health hazard. Unfortunately, not every mold is visible, and you might not know that it could be all over your home without you knowing about it. Basically, mold is a fungus that spreads through tiny airborne spores that impact indoor air quality. When the airborne spores of mold land in strategic locations in the most suitable conditions, they quickly multiply and form a colony within 24 hours. Usually, mold thrives in damp and warm areas. So, if your home has an average indoor temperature of 40-100 Fahrenheit, you need to stay aware. In fact, it’s highly likely that there already is mold growth in your bathroom and basement.

Are you suspicious of mold growth in your home? You’ve landed on the right page, then.

This blog will discuss how to test for mold in a house, specifically focusing on different areas. We will also mention some preventive measures that you can take to protect your property from mold.

How to Test for Mold In A House Using a Test Kit?

The most common way to test for mold is by using a mold test kit. You can find these kits in any home improvement store near your house. If they are not available there, you can get them from an online retailer. But know that not all test kits are the same. Some are only designed to determine the presence of mold on surfaces. So, if you want to test for mold spores in the air, then you need to use a viable mold detection kit.

Once you have bought the kit, you must identify the areas suspected of mold growth, typically with water damage or humidity. Later, you need to follow the instructions given on the kit to collect samples from these areas. Most of the time, you can follow swabbing surfaces or air sampling methods. When the samples are collected, seal them properly and label them as directed. Some kits provide instant results, while others might need you to send samples to the laboratory for analysis. In the latter case, you must promptly send the samples using any provided packaging. Once you get the results, you can analyze them further using the test kit guidelines or follow the instructions in the report. This will help you determine the presence and type of mold. Even though mold testing using a test kit seems like an easy approach, it is not very accurate. Getting professional testing is better if you want more reliable and accurate results.

If you wish to test for mold in the air, follow the manufacturer’s instructions and use a mold test kit designed for airborne spores. These kits typically involve setting up a spore trap in the affected area, which is then sent to a lab for analysis. For precise and comprehensive results, consider hiring a professional mold inspector.

How to Test for Mold In Different Areas of the House?


To test for mold in walls, you need to start by looking for signs of mold, such as visible discoloration, a must odor, or signs of water damage. Purchase a mold test kit that includes tools for wall testing, like a small drill bit, adhesive strips, and collection containers. Carefully drill a small hole in the suspected wall area (be mindful of electrical wiring and plumbing). Insert a swab or collection device from the test kit into the hole to gather a sample from the inner wall surface. Seal the sample in the provided container as per the kit’s instructions. After this, you may need to send the sample to a laboratory for analysis or use an instant detection method included in the kit. Interpreting the results will help you determine the mold’s presence and type. If the mold is detected, then you may need to seek professional help for mold inspection and remediation.


Just like testing for mold in walls, you need to look for visible signs of mold growth in basements. You may use a flashlight to check dark corners, behind furniture, and under carpets. Once you know mold is there, buy a mold testing kit, specifically the one with either swabs or a petri dish. Follow the given instructions to collect samples from suspected areas and incubate them as directed. For a more thorough assessment, consider using an air quality monitor to detect mold spores. If the presence of mold is confirmed, or if you suspect a significant infestation, it is advisable to contact a professional. They will then perform mold remediation for a comprehensive evaluation and removal.


Testing for mold in the bathroom requires you to start by conducting a visual inspection. You shall focus on common problem areas such as grout lines, caulking, under sinks, and around the edges of bathtubs and showers. Look for discoloration, fuzzy growths, or water stains, and take note of any persistent musty odors. Next, buy a mold testing kit, which typically includes swabs and petri dishes. Follow the kit’s instructions to collect samples from suspected mold sites and incubate them according to the guidelines provided. Just like the other two areas, if you detect mold, you need to hire a professional mold remediation expert to perform a comprehensive inspection further and safely remove the mold. Read more about where can you find mold in your home.


To prevent mold in your home, maintain a dry, well-ventilated environment and promptly address moisture issues. You also need to ensure proper ventilation in high-humidity areas like bathrooms, kitchens, and basements by using exhaust fans or dehumidifiers. Additionally, regularly inspect and repair any leaks in roofs, windows, and plumbing to prevent water accumulation. Plus, mold-resistant products, such as paints and building materials, should be used in areas prone to dampness. Clean and dry any damp surfaces within 24-48 hours to prevent mold growth. Besides this, air circulation can be improved by opening windows and using fans, and indoor humidity levels can be kept below 60% by using air conditioners and dehumidifiers. Lastly, regularly clean and maintain gutters to prevent water damage to the home’s foundation and walls.

Uncover hidden mold threats with Peace of Mind Home Inspections expert mold inspection services. Our thorough assessment detects and addresses mold growth and moisture issues, ensuring your home stays healthy and safe. Schedule your inspection now for peace of mind.