What Do I Do If I Find Mold During a Home Renovation?
Last updated October 23, 2026
The short answer
Stop Work and Secure the Area
Finding mold means pausing your project right away. Continued demolition or sanding can release a large number of spores into your home's air. This increases health risks and can spread the mold to other rooms. Limit access to the area and consider closing doors or hanging plastic sheeting as a temporary barrier while you plan your next steps.
Turning off the HVAC system in that part of the house is also wise. This prevents the system from circulating contaminated air. Keep children and pets away from the work zone. Avoid using fans, as they can stir up spores. Your immediate goal is to contain the situation until a professional can evaluate it.
Assess the Situation Safely
Look at the mold without touching it to gauge the extent. A small patch, less than about ten square feet, might be manageable with proper precautions. However, any mold found inside walls or covering a large area requires professional help. Mold often indicates a past or ongoing moisture problem that needs to be fixed.
Pay attention to the mold's color and location. Black, green, or white fuzzy growths are common. Mold behind drywall or under flooring suggests hidden water damage. If you see extensive growth, or if anyone in your home has allergies or asthma, do not proceed with cleanup yourself. The health risks from exposure are significant.
Call a Mold Professional
For anything beyond a tiny, surface-level spot, contacting a mold remediation specialist is the safest course. These professionals have the training and equipment to handle contamination safely. They will assess the type and extent of mold, identify the moisture source, and create a plan for removal and drying.
The pros use containment procedures, air scrubbers, and personal protective equipment to prevent cross-contamination. They can also safely dispose of moldy materials like drywall and insulation. Attempting a large cleanup yourself often fails to address the root cause and can lead to mold returning quickly.
- Identify the type and extent of mold growth.
- Locate and address the source of the moisture.
- Set up containment to protect other areas of your home.
- Safely remove and dispose of contaminated materials.
- Clean and disinfect salvageable surfaces and items.
- Dry the area completely to prevent regrowth.
Address the Moisture Source
Mold cannot grow without moisture. Simply cleaning it without fixing the water problem is a temporary solution. The mold professional will help you find the leak, condensation issue, or high humidity that allowed the mold to develop. This step is critical to ensure the mold does not return after your renovation is complete.
Common sources include plumbing leaks, roof leaks, poor ventilation, or past flooding. In a humid subtropical climate with hot rainy summers and an Atlantic hurricane season, indoor humidity control is especially important. After the mold is removed, you may need repairs from other trades, like a plumber or roofer, to permanently solve the moisture issue.
Consider Renovation and Insurance
Discovering mold will likely delay your renovation timeline. The affected area must be fully remediated and dried before any new construction materials can be installed. Work with your mold professional and contractor to adjust schedules and plans. All damaged structural materials, like studs or subflooring, must be replaced if they cannot be cleaned.
Check your homeowner's insurance policy regarding mold damage. Some policies may cover remediation if the mold resulted from a sudden, covered water event, like a burst pipe. Policies vary, and your insurer decides what is covered. Document the find with photos and keep all reports from the mold professional for a potential claim.
Water damage does not wait
Every hour counts once water gets into floors and walls. One call starts the response.
Call Now (504) 608-0810Frequently asked questions
Can I just paint over the mold I found?
No, painting over mold does not kill it. The mold will continue to grow underneath the paint, damaging the new surface and potentially releasing spores into your home. The underlying moisture problem and the mold itself must be properly addressed first.
What if the mold is in my bathroom renovation?
Bathrooms are prone to mold due to high humidity. Stop work and have it assessed. The fix involves removing the moldy materials, repairing any hidden leaks from pipes or showers, and ensuring the new design includes proper ventilation, like an exhaust fan, to prevent future growth.
How do I know if the mold is toxic?
You cannot reliably identify toxic mold by sight or smell. Some types, like Stachybotrys (black mold), can produce toxins, but testing is needed for confirmation. A mold professional can take samples for analysis. Treat all extensive mold finds with caution and assume it could be hazardous.