The article discusses the impact of surface emissivity on thermograms, obtained from a thermal imaging camera during measurements of construction objects. The study is carried out as an analysis of digital and thermal images for three selected materials types of building finishing such as: wood outside doors, cement-lime plaster and glass façade. The images obtained from the exterior and from the interior of the buildings were compared and analyzed in terms of spectrum intensity within the range of ambient temperature. The influence of the most significant factors on the surface emissivity was discussed on the basis of the experiment,. The study of materials with different emissivity at reference conditions helped to identify influence of materials reflectivity on obtained temperature spectrum values and to correctly perform the research.