1. Why Office Buildings Have Radon Risk
Radon enters any building that has a foundation in contact with the soil. Office buildings, medical offices, retail spaces, and other commercial buildings have the same exposure to soil gas as residential homes. The foundation type, soil conditions, and building pressurization determine how much radon gets inside.
Commercial buildings can actually have elevated radon risk for several reasons. Large HVAC systems can create significant negative pressure on lower floors, drawing soil gas in more aggressively than residential systems. Commercial buildings often have larger foundation footprints, meaning more potential entry points. And buildings with below-grade levels (parking garages, storage areas, ground-floor offices on sloped sites) have extensive soil contact.
The Atlanta metro area sits on geology that produces moderate to high radon levels. Any commercial building in Fulton, Gwinnett, Cobb, Cherokee, or surrounding counties has the same geological radon potential as the residential homes nearby. The fact that it is a commercial building rather than a house does not change the geology. Our workplace radon testing services cover offices throughout Metro Atlanta.
2. Who Should Test Commercial Buildings
The responsibility for radon testing in a commercial building depends on the ownership and lease structure.
Building Owners
Building owners have the primary responsibility for the physical condition of the building. Testing for radon and addressing elevated levels is part of maintaining a safe building environment. This is especially important for owner-occupied buildings and for attracting and retaining tenants.
Property Managers
Property management companies often handle building maintenance and safety. Including radon testing in the building management protocol demonstrates proactive risk management and protects the property owner from potential liability.
Employers and Tenants
Employers have a general duty to provide a safe workplace. If the building owner has not tested, tenants can arrange testing of their specific space. The results may prompt the owner to take action, especially if the lease includes provisions about building safety.
Concerned Employees
If you work in a ground-level or below-grade office and are concerned about radon, you can request that your employer or building management arrange testing. Framing the request around workplace safety and referencing EPA guidance is an effective approach.
3. The Commercial Testing Process
Commercial radon testing follows similar principles to residential testing but is scaled for larger buildings. The EPA provides guidance specifically for testing in schools and large buildings that applies to commercial spaces as well.
For commercial buildings, testing typically involves placing multiple monitors on the lowest occupied level. The number of monitors depends on the building size. A general guideline is one monitor per 2,000 square feet of ground-contact area, though this varies based on the building layout and how the space is divided.
Tests are conducted under normal building operating conditions, with the HVAC system running on its regular schedule. Weekend and overnight conditions should reflect typical patterns. If the building HVAC shuts down on weekends, the test should include at least one full weekend period to capture those conditions.
HVAC Shutdown Periods
Buildings that shut down their HVAC systems on weekends and holidays may see radon levels spike during these periods. Without the ventilation provided by the HVAC system, radon can accumulate. Testing should capture these shutdown periods for accurate results. Monday morning readings after a weekend shutdown can be particularly revealing.
4. Employee Health Considerations
Employees who work in ground-level or below-grade offices spend 2,000+ hours per year in their workspace. That is a significant amount of time. If radon levels are elevated in that workspace, their cumulative exposure adds up quickly.
The EPA uses the same 4 pCi/L action level for workplaces as for homes. However, some occupational health professionals recommend considering that workers spend fewer hours per day in the office than residents spend at home. This means the same radon level produces less total exposure in an office than in a home. Still, any reading above 4 pCi/L warrants action.
Employers who proactively test for and address radon demonstrate a commitment to employee health and wellness. In a competitive employment market, indoor air quality is increasingly part of the conversation about workplace quality. For broader guidance on commercial properties, see our commercial radon testing guide.
5. Commercial Radon Mitigation
Commercial buildings can be effectively mitigated using the same sub-slab depressurization principles as residential buildings. The systems are scaled appropriately for larger foundation areas, which may require multiple suction points and larger fans.
In commercial settings, there are additional options available. Building HVAC systems can sometimes be adjusted to maintain positive pressure on lower levels, which reduces the pressure differential that drives radon entry. This approach works best as a complement to active depressurization rather than a standalone solution.
Commercial mitigation installations are typically scheduled during off-hours to minimize disruption to business operations. Most systems can be installed in one to two days depending on the building size and complexity.
Minimal Business Disruption
Commercial radon mitigation is designed to be minimally disruptive. The suction point can often be located in a utility room, parking garage, or other non-public area. The exhaust pipe is routed to avoid high-visibility areas. Employees can work normally during and after installation.
6. Building Management Best Practices
Responsible building management includes radon as part of the overall indoor air quality program. Here are best practices for commercial building owners and managers.
Test all ground-contact areas at least once, and retest every 2 years or after any significant building modifications. Maintain records of all test results and any mitigation work performed. Include radon status in tenant disclosures and lease documentation.
If mitigation is installed, maintain the system according to the manufacturer's recommendations. Monitor the system manometer regularly and schedule fan replacement when needed. Keep documentation of all maintenance activities.
For new construction or major renovations, incorporate radon-resistant construction techniques into the project specifications. These features are inexpensive to include during construction and can prevent radon problems from developing.
