Energy saving is an important issue. Heating and cooling systems in buildings consume too much energy. Therefore new regulations have appeared in Europe to control the energy consumed by such systems. Building insulation efficiency is our concern here, not the heating or cooling systems themselves. Thermography is a practical tool for checking insulation efficiency. This tool requires the geometry and visible view of the building concerned, to compute correctly the amount of heat emitted and then check it against the accepted limits. In this paper, an integration technique for the thermal image, the laser scanner point cloud/mesh and the digital image is introduced. After registering and fusing the three data sets a Themal3DImage is created. An evaluation test was performed and it was found that registering the thermal and visual images using two-dimensional transformation equations provided reliable results.