Expert Advice on Green Buildings

Indoor Environmental Quality: Quantifiable Improvements in Worker Productivity?

     
Question:

What is the actual return on investment from improvements to indoor environmental quality? I have never seen any hard data.

Widely accepted quantifiable data surrounding worker productivity gains from improved indoor environmental quality remains scant.

However, a 2003 study penned by Vivian Loftness, a professor at Carnegie Mellon University, provided data on measurements as to how certain green building characteristics and features increased worker productivity.

Loftness recorded a 3-18% gain in productivity in buildings with daylighting systems. Daylighting systems provide reduced artificial light and increased natural light as natural light is available.

Loftness found a 0.4-7.5% gain in building environments with natural ventilation (such as operable windows) and/or access to the outdoors. In buildings with individual temperature controls, a 0.2-3 percent gain productivity was found.

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According to Charles

According to Charles Lockwood, a green building consultant, when Toyota moved into a LEED gold building, absenteeism dropped 14%. When PNC did the same, turnover among staffers dropped by 50% compared with standard PNC buildings.

For every 1% increase in productivity, employers save $600 to $700 per worker per year, depending on salaries of course. On average, Mr. Lockwood says, employers find that productivity increases by fifteen percent annually after a green building retrofit.

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