Is a Commercial Landlord Responsible for Mold?
Last updated October 31, 2026
The short answer
Lease Terms and Responsibilities
Your commercial lease is the first place to look. Many leases spell out who handles repairs and maintenance. Some leases put responsibility on the tenant, especially for interior upkeep or damage caused by your business activities. Others make the landlord responsible for structural issues and common areas.
If the lease is silent, state law and local building codes often step in. Landlords generally must keep the property habitable and safe. That duty can include addressing mold that comes from a leaky roof, faulty plumbing, or poor ventilation in shared spaces. You need to read your lease carefully and know what it says.
Causes of Mold and Who Acts
Mold grows because of moisture. The source of that moisture often decides who is responsible. If a landlord ignores a leaking pipe or a damaged roof, the landlord usually must fix it. If you, as the tenant, left a window open during a storm or failed to report a small leak, you might be on the hook.
Tenants also have duties. You should report leaks and water damage quickly. Keeping the space ventilated and avoiding excessive humidity helps prevent mold. If you notice mold, document it with photos and notes. That record helps if you need to discuss responsibility with your landlord.
- Check your lease for maintenance clauses
- Report water leaks to the landlord in writing
- Take photos of any visible mold or moisture
- Keep indoor humidity below 60 percent
- Clean up small spills within 24 to 48 hours
- Ask about the building's ventilation system
Health and Safety Concerns
Mold can cause health problems, especially for people with allergies or asthma. Symptoms may include coughing, sneezing, or irritated eyes. If you or your employees feel unwell, see a doctor. You should not ignore mold, as it can spread and damage building materials.
For your own safety, avoid touching mold with bare hands. Wear gloves and a mask if you need to clean small areas. For larger growth, the pros can handle removal and cleanup. They have the right equipment to protect themselves and the building.
Insurance and Legal Steps
Your insurance policy may cover mold damage, but it depends on your policy and the cause. Some policies exclude mold or have limits. Your landlord's policy might cover the building, but not your belongings. Check your policy and ask your insurance company what is covered.
If the landlord refuses to address mold, you may have legal options. You can contact your local building department or health department. They can inspect the property and enforce codes. You might also consider talking to a lawyer, but that is your choice. Policies vary, and your insurer decides what is covered.
When to Call the Pros
If mold covers more than a small patch, or if it keeps coming back, call local water damage pros. They can find the source of moisture and dry out the area. In Quincy, a humid coastal climate means mold can be a recurring issue, so acting quickly matters.
The pros use moisture meters and inspections to find hidden leaks. They can remove water-damaged materials like drywall or flooring. Their work usually involves drying, cleaning, and sometimes replacing materials. You should act quickly to limit damage and health risks.
- Look for dark spots on walls or ceilings
- Notice a musty smell in the building
- See peeling paint or bubbling drywall
- Find standing water or damp carpets
- Experience allergy symptoms at work
- Check for condensation on windows or pipes
Water damage does not wait
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (617) 404-2753Frequently asked questions
Can a tenant be responsible for mold in a commercial lease?
Yes, a tenant can be responsible if the mold results from tenant actions, like failing to report a leak or causing excess moisture. Many leases assign responsibility for interior maintenance to the tenant. Always read your lease to know your duties.
What should I do if the landlord ignores mold?
Document the mold with photos and written reports. Send a formal notice to the landlord. You can also contact your local building or health department for an inspection. Keep records of all communication in case you need them later.
Does insurance cover mold damage in a commercial building?
Coverage depends on your policy and the cause of the mold. Some policies cover mold if it comes from a sudden event like a burst pipe, but others exclude it. Check your policy and ask your insurance company about mold coverage.