An employee looking mildly uncomfortable and visible HVAC vents.

The Impact of Sick Building Syndrome on Workplace Health and Performance

Sick building syndrome describes situations where building occupants experience acute health or comfort symptoms that appear linked to time spent in a building, but no specific illness or single cause is identified. In workplaces, these concerns may show up as recurring complaints about headaches, irritation, fatigue, odors, stuffiness, dizziness, or difficulty concentrating that improve when employees leave the building.

For employers and facility leaders, sick building syndrome is not something to dismiss or diagnose casually. It is a signal that indoor environmental conditions should be evaluated carefully. A structured indoor air quality assessment can help identify whether ventilation, pollutant sources, moisture, HVAC operation, building maintenance, temperature, humidity, or other factors may be contributing to occupant complaints.

What Is Sick Building Syndrome?

Sick building syndrome is commonly used to describe a pattern of symptoms among building occupants that appears connected to being inside a specific building or area, even when no single diagnosable illness or contaminant source has been confirmed.

EPA distinguishes sick building syndrome from building-related illness. With sick building syndrome, occupants report discomfort or symptoms associated with time in the building, but the exact cause is not known. Building-related illness is different because symptoms can be clinically defined and attributed to a specific airborne building contaminant.

This distinction matters. If employees feel worse in a specific work area and better away from the building, the concern deserves investigation, but the cause may be multifactorial. Indoor air quality, lighting, noise, thermal discomfort, vibration, overcrowding, work stress, allergies, and individual sensitivity can all contribute to similar symptoms.

Common Causes of Sick Building Syndrome

Sick building syndrome concerns often involve more than one cause. A building may have several low-level conditions that combine to create discomfort, complaints, or reduced confidence in the work environment.

Common contributing factors include:

Inadequate outdoor air or poor ventilation distribution.
Poorly maintained or poorly operated HVAC systems.
Pollutant sources inside the building.
Chemical odors from cleaning, maintenance, coatings, adhesives, furnishings, or equipment.
VOCs from building materials, products, or process activities.
Dust, particulates, or contaminants migrating from production, construction, or storage areas.
Moisture, water intrusion, damp materials, or mold-related concerns.
Temperature or humidity outside the comfort range.
Crowding or building uses that differ from the original design.
Outdoor pollutant sources entering through intakes, doors, windows, or pressure imbalances.

EPA explains that three major reasons for poor indoor air quality in office buildings are indoor pollution sources, poorly designed or operated ventilation systems, and building uses that were not anticipated or planned for when the building was designed or renovated.

In commercial, industrial, healthcare, and manufacturing workplaces, these concerns can become more complex when office areas are connected to shops, labs, production spaces, loading areas, construction zones, or mechanical rooms.

Signs and Symptoms of Sick Building Syndrome

Sick building syndrome symptoms are typically nonspecific, which means they can overlap with many other causes. EPA lists common occupant complaints such as dry or burning eyes, nose, and throat; sneezing; stuffy or runny nose; fatigue; headache; dizziness; nausea; irritability; and forgetfulness.

Other complaints may include:

Dry cough or throat irritation.
Sensitivity to odors.
Difficulty concentrating.
General discomfort or malaise.
Skin dryness or irritation.
Symptoms that seem worse in a specific room, zone, floor, or building.
Symptoms that improve after leaving work, over weekends, or away from the affected area.

These symptoms do not automatically prove that poor IAQ is the cause. EPA notes that poor lighting, noise, vibration, thermal discomfort, and psychological stress may also cause or contribute to similar symptoms. That is why a careful investigation should look at patterns, timing, locations, building systems, occupant reports, and environmental measurements.

How Sick Building Syndrome Affects Employee Productivity

When employees do not feel well in a building, productivity can suffer even before a specific contaminant or system issue is confirmed. Repeated discomfort can affect concentration, communication, attendance, confidence, and the amount of time managers spend responding to complaints.

Potential productivity impacts include:

More frequent interruptions as employees report symptoms or ask for workspace changes.
Reduced concentration in affected rooms or zones.
Increased concern about odors, stuffiness, or air movement.
Lower confidence in facility management or EHS response.
More time spent investigating informal complaints without a clear process.
Difficulty using certain spaces if employees avoid areas they associate with symptoms.
Disruption during reactive maintenance, relocation, or urgent testing.

The business issue is not only whether a contaminant is above a specific threshold. The issue is that unresolved indoor environmental concerns create uncertainty. A professional indoor air assessment can help convert that uncertainty into documented observations, measurements, and next steps.

The Impact on Employee Health and Well-Being

Employee health and well-being are central to sick building syndrome concerns. Even when symptoms are nonspecific, they can affect how people experience the workplace and whether they believe concerns are being taken seriously.

EPA’s indoor air quality guidance explains that some indoor air pollutant effects may occur soon after exposure, including irritation of the eyes, nose, and throat, headaches, dizziness, and fatigue. EPA also notes that individual reactions vary and that symptoms similar to colds or other viral diseases can make it difficult to determine whether indoor air pollution is involved.

For employers, that means two things:

Do not assume every symptom is caused by the building.
Do not ignore recurring symptom patterns tied to a building, room, floor, or work activity.

A thoughtful response protects both employees and the organization. It shows that the company is evaluating the concern with structure, documentation, and technical support rather than relying on guesswork.

Strategies to Prevent and Address Sick Building Syndrome

Preventing and addressing sick building syndrome starts with good building management and a clear response process. The goal is to identify likely contributors, correct practical issues, and document what was found.

Useful strategies include:

Listen for patterns. Track symptoms by location, time of day, season, work activity, recent maintenance, and whether symptoms improve away from the building.
Review ventilation. Evaluate outdoor air, air distribution, pressure relationships, filter condition, and HVAC operation.
Control pollutant sources. Review cleaning products, chemicals, furnishings, building materials, equipment, storage, and nearby process areas.
Manage moisture. Address leaks, condensation, damp materials, humidity concerns, and water-damaged materials promptly.
Maintain HVAC systems. Inspect filters, coils, drain pans, ducts, dampers, fans, and control settings.
Review recent changes. Consider renovations, new furnishings, new products, space-use changes, increased occupancy, or equipment changes.
Communicate clearly. Explain what is being evaluated, what has been found, and what actions are planned.
Document corrective actions. Keep records of observations, testing, maintenance, repairs, and follow-up.

EPA recommends investigation and analysis of the implicated building, especially HVAC system design and operation, when sick building syndrome concerns persist. In many cases, a multidisciplinary approach involving facility management, EHS, industrial hygiene, building engineers, and leadership is useful.

How Professional Indoor Air Quality Services Can Help

Professional indoor air quality services help organizations investigate complaints with a structured process. Instead of testing randomly or guessing at causes, an IAQ assessment defines the concern, reviews likely contributors, collects targeted measurements, and translates findings into practical recommendations.

Depending on the situation, an IAQ assessment may include:

Complaint history and location pattern review.
Building walk-through and source identification.
HVAC and ventilation observations.
Temperature and relative humidity measurements.
Carbon dioxide screening as a ventilation indicator.
Carbon monoxide screening when combustion concerns exist.
Particulate or dust measurements.
VOC screening or targeted chemical sampling.
Moisture, water intrusion, or mold-related evaluation.
Review of construction, maintenance, cleaning, or process activities.
Written findings, interpretation, and corrective recommendations.

Summit’s Indoor Air Quality Testing and industrial hygiene services can help organizations evaluate IAQ concerns, identify possible contaminant sources, characterize exposure conditions, and document corrective priorities. This is especially useful when complaints involve complex facilities, technical processes, manufacturing areas, healthcare spaces, construction activity, or mixed office and industrial environments.

Creating Healthier and More Productive Workspaces

Sick building syndrome concerns are frustrating because they often begin with unclear symptoms and incomplete information. A building may feel uncomfortable to employees, but the reason may not be obvious from a quick walk-through. That is exactly when a structured IAQ investigation can help.

The practical goal is to create a healthier, more productive workspace by answering key questions:

Where are complaints occurring?
When do symptoms appear or improve?
What building systems or sources may be involved?
Are ventilation, humidity, temperature, or pressure conditions contributing?
Are dust, odors, VOCs, moisture, or maintenance issues present?
What corrective actions should be prioritized?
How should findings be documented and communicated?

If your organization is dealing with recurring occupant complaints, odors, stuffy areas, irritation symptoms, moisture concerns, or uncertainty about indoor environmental quality, Summit can help determine whether professional indoor air quality services are the right next step.

Talk with Summit about an indoor air quality assessment if your workplace is experiencing recurring occupant complaints, odors, ventilation concerns, moisture issues, or symptoms that appear connected to time spent in the building.

Sick Building Syndrome FAQs

What is sick building syndrome?

What are common symptoms of sick building syndrome?

Common symptoms may include eye, nose, or throat irritation, headache, fatigue, dizziness, nausea, dry cough, stuffy or runny nose, odor sensitivity, difficulty concentrating, or discomfort that improves after leaving the building.

What causes sick building syndrome?

Sick building syndrome can have multiple contributing factors, including inadequate ventilation, pollutant sources, poorly maintained HVAC systems, moisture or mold concerns, chemical odors, temperature or humidity issues, dust, renovation activity, and other indoor environmental stressors.

How can indoor air quality testing help with sick building syndrome concerns?

Indoor air quality testing can help identify possible contributing factors, document building conditions, evaluate ventilation and contaminant concerns, and guide corrective actions. Testing should be targeted to the complaint pattern, building conditions, and suspected sources.