The purpose of this study was to look at the effects that height-adjustable workstations on occupational sitting time and workplace productivity in office workers. Participants workplace activity (sitting, standing and walking) and productivity was measured before the installation of the height-adjustable workstations. Workplace activity and productivity were then measured four weeks after the installation of height-adjustable workstations and four weeks after the removal of height-adjustable workstations, where possible. The results were compared to a control group who received no intervention whilst the intervention had the height-adjustable workstations.