Increase of energy efficiency and thermal performance for buildings is an actual problem of construction and architecture. The solution of this problem is necessary at all stages of life cycle of the building — during the carrying out engineering researches, design, construction, operation, reconstruction, capital repairs, demolition. In this article the complex assessment of energy efficiency and thermal performance for multiroom residential buildings including is executed: visual and tool inspection, thermovision quality control of thermal performance, settlement assessment of thermophysical parameters of building elements. Based on visual and tool inspection of the object used for the general assessment of its thermophysical condition the conclusion is drawn on discrepancy of the specified object to requirements of project and standard documentation. Thermovision quality control of thermal performance of the object allowed to reveal reasonably numerous defects of a heat-insulating enclosure of buildings and to plan ways for their elimination. The settlement assessment of thermophysical parameters of enclosing structures based on numerical simulation of heat transfer process allowed to develop reasonably offers an increase of buildings enclosures thermal performance. Complex application of the above methods allowed defining thermophysical condition of object in general. The received results give the chance to assess damage caused to the customer owing to the works of inadequate quality performed by the contractor and are a basis for development of the project of reconstruction of buildings for the purpose of their reduction in compliance with requirements of project and standard documentation. Results of researches are base for development of methodological bases of design, construction, operation and reconstruction of energy effective buildings.