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1. Check for Mold

Mold proliferates in cool, dark spaces. That is an accurate description of most closed office spaces. Poor air circulation contributes to mold growth. It allows spores to settle, making it harder for moisture from humidity and other sources to evaporate.

Mold can cause allergic reactions as well as short- and long-term respiratory problems. People with asthma are especially at risk.

At minimum, conduct a visual inspection for mold in all areas of your building. If your heating, cooling, and ventilation systems were deactivated, consider asking a professional to inspect those systems, which are susceptible to mold growth when not in use. Also consider calling a professional if there are signs of leaks, water damage, or other dampness.

2. Check for Rodents and Pests

Rodents, pests, and their waste can carry disease or cause respiratory problems, not to mention the disturbing experience of seeing vermin scurrying through halls or around corners. Employees, tenants, and customers are not likely to feel welcome in a building that has a pest problem. 

Before you begin to clean, look for signs of pests, such as droppings, shredded paper, or other nesting materials. Check for holes in walls or containers. You may wish to enlist the help of a pest control specialist if you suspect pests may be present.

3. Flush the Water System

While your water system should normally be sealed, Legionella and other bacteria can enter through tiny leaks and grow when the system is not in use. Depending on your building's plumbing, the water may become unsafe within days, weeks, or months of non-use.

Before reopening, turn on the water throughout your building so that the water in the pipes is completely replaced. Clean faucets and other exterior surfaces as well as any filters or pumps that you would normally maintain.

4. Follow New Construction Guidance When Restarting HVAC Systems

If your HVAC system was totally shut down rather than operating under reduced capacity, follow or ask if your contractor follows the Standard Practice for the Inspection and Maintenance of Commercial Building HVAC Systems. The goal is to prevent damage to your system while checking for mold, dust, and other pollutants that may have entered the system while it was off.

5. Provide for Increased Air Circulation

If your business needed to close due to airborne health issues, such as a virus outbreak or mold, one major considerion you may want to think about is increasing air circulation and bringing in outside air. This disperses airborne particles that can accumulate in a room.

If possible, set up your building so that windows and doors can be used to ventilate when needed. This may mean you need to install screens to keep out bugs or safety bars to prevent falls. When making improvements to air circulation, be aware of outside risks such as carbon monoxide from a road or loading bay, pollen, or other contaminants.

Many heating and cooling systems only recirculate indoor air and don't have filters strong enough to remove viruses or mold particles, but can often be upgraded to do so. Air exchange systems can help replace indoor air with fresh outdoor air while also maintaining a comfortable temperature inside. 

6. Identify and Mitigate High-Risk Areas

For health-related closures, there may still be an increased risk in crowded areas such as conference rooms, cafeterias, locker rooms, elevators, and main entrances. If you have available space due to remote work or reduced occupancy, consider expanding into these areas to improve physical distancing. Occupancy limits may also be needed.

When it comes to employee workspaces, you may need to make adjustments. This might include separating desks, facing desks away from each other, or installing physical barriers.

7. Increase Cleaning Protocols

In many workspaces, only bathrooms receive daily cleaning while most other areas are spot-cleaned or cleaned periodically. Consider daily or more frequent cleaning of all touch points and surfaces. You may also want to place disinfectant sprays or wipes in shared employee spaces for easy access.

8. Review Your Lease

As you work to reopen, consider whether any of these needs should be addressed in your Commercial Lease agreement. If you have concerns about potential liability issues, modifying your lease, or other questions about re-opening your building, ask a Legal Pro.

Please note: This page offers general legal information, not but not legal advice tailored for your specific legal situation. Rocket Lawyer Incorporated isn't a law firm or a substitute for one. For further information on this topic, you can Ask a Legal Pro.


Written and Reviewed by Experts
Written and Reviewed by Experts
This article was created, edited and reviewed by trained editorial staff who specialize in translating complex legal topics into plain language.

At Rocket Lawyer, we believe legal information should be both reliable and easy to understand—so you don't need a law degree to feel informed. We follow a rigorous editorial policy to ensure every article is helpful, clear, and as accurate and up-to-date as possible.

About this page:

  • This article was written and reviewed by Rocket Lawyer editorial staff
  • This article was last reviewed or updated on Sep 8, 2025

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