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Building Reoccupancy Indoor Environmental Quality Inspections

Prepare your building for reoccupation after a period of limited use with safety inspections and air and water quality testing.

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Prepare your building and occupants to quickly reoccupy after disruption

Disruptions to standard business operations can leave buildings sitting empty for a variety of reasons. Having a plan for reoccupancy can allow you act quickly if your building is impacted.

UL’s building reoccupancy plan includes:

Building Reoccupancy Icons

When you're ready to reoccupy your building, UL can help you confirm your response plans protect building occupants. Clients will receive a certificate verifying that buildings meet UL's IEQ inspection standards.

Schedule a consultation to discuss building reoccupancy

Ready to learn more about building reoccupancy inspections? Contact us today for a free consultation.

Reoccupancy plans that protect building occupants

UL’s reoccupancy inspection services include:

  • HVAC inspection of representative air handling units and an assessment of the type, installation and condition of filters present with regard to their impact on indoor air quality.
  • Spot air quality testing and inspection throughout the building for:
    • Airborne particulate matter (PM) (PM2.5 and PM10) using electronic aerosol mass monitors.
    • Temperature and relative humidity (RH) using electronic thermohygrometers to monitor thermal conditions.
    • Screening tests for total volatile organic compounds (TVOC) using a photo-ionization detector (PID).
    • Carbon dioxide levels (if appropriate) using non-dispersion infrared absorption techniques.
    • Air flow pathways using smoke detector tubes to determine proper differential pressure relationships within the building and relative to the outdoors.
    • A cursory check using thermal imaging diagnostics (and moisture meter testing when appropriate) where water is typically present during normal building functions. Representative areas include:
      • around and below sinks
      • showers
      • toilets
      • kitchens
      • fountains
      • water coolers
      • refrigerators
      • janitor’s closets
      • accessible pipe chases
      • decorative indoor plant containers
  • Water quality sampling for bacteria levels, heavy metals and other contaminants of concern from representative domestic water fixtures to include any of the following:
    • Heterotopic plate count (HPC) sampling for total bacteria counts
    • UL’s proprietary water quality test, WaterScreen® –  designed to provide a comprehensive and economical analysis of domestic water in a building. Analytes include microbials, metals, inorganic/physical parameters, pH, total dissolved solids (TDS), turbidity and free chlorine levels.
      • Legionella sampling with rapid on-site analysis via quantitative polmerase chain reaction (qPCR) technology
  • Janitorial efficacy evaluation via:
    • Visual assessment and evaluation of representative areas per Association of Physical Plan Administrators (APPA) guiding principles for custodial effectiveness
    • Surface sampling of representative high touch surfaces such as elevator buttons, countertops, door handles and handrails to validate disinfection efforts

Benefits of a building reoccupancy IEQ plan

When you need to reoccupy your building after a business disruption, turn to our indoor environmental quality and environmental health and safety expertise and a multidisciplinary core team of board-certified infection control, industrial hygiene, public health and safety professionals.

Schedule a consultation to discuss building reoccupancy

Ready to learn more about building reoccupancy inspections? Contact us today for a free consultation.

Ongoing education for workplace health and safety

As you prepare to reoccupy your space, it's important you know what to expect and what to do so you and others may work safely. UL offers several e-learning training programs to help educate members of your organization, including the following:

  • Preparing building for occupancy following a prolonged shutdown
  • Safe return to the workspace


Disclaimer: Seller provides no explicit or implied warranties that microbiological (including without limitation bacterial, fungal, protozoan, or viral) activity or other pollutants and contaminants at Client’s property are not or will not be present or will not recur in the future, nor does UL make any guarantee or representation that the building, area, property or site which it has assessed is healthy, clean, free from bacteria, viruses, fungus, protozoans, or fit for a specific purpose for Client, its tenants or any other third-parties.

Learn more

Download the building reoccupancy checklist and info sheet to expand your knowledge on safely reoccupying your building. 

Schedule a consultation to discuss building reoccupancy

Ready to learn more about building reoccupancy inspections? Contact us today for a free consultation.

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Building a pandemic response plan with UL

Activating a comprehensive and precise response plan can mitigate the impact of a pandemic on a building and its occupants. 

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