This study investigates the effect of environmental control on Sick Building Syndrome (SBS). This is examined by environmentalmeasurement, user health and satisfaction at two workplaces with respectively low and high levels of individual control over the thermalenvironment. The Anglo-Saxon practice of the open plan workplace is compared to the traditional Scandinavian practice, with a greaterpreponderance of cellular office accommodation. The research will lead to the formulation of specific strategies to enhance opportunities in providingthermal comfort in the workplace. Two case studies are described with respectively low and high provision of individual environmental control. Alow energy open plan office in Scotland is selected with natural ventilation, where limited users have access to windows. In contrast, an airconditioned cellular plan office in Norway with excessive use of energy is selected providing every user with control over a window and the ability toadjust heating and cooling. Complementary quantitative and qualitative methodologies are applied. Particular emphasis is given to GroundedTheory methods. Building users' health conditions and perception of their thermal environment are recorded through a questionnaire and empiricalbuilding performance through the measurement of the thermal environment. These traditional techniques are further reinforced with semi-structuredinterviews to investigate the environmental control. A new visual recording method is applied to qualitatively analyse the subject in its context.Information regarding all users and their environment is applied as colour codes to floor plate layouts. The study examines the significance ofenvironmental control and its effect on Sick Building Syndrome in a comparison between a low carbon open plan and a cellular plan workplacewith higher energy consumption. Through this a balanced appraisal can be made of comfort profiles and user's health between the twobenchmarked buildings.