The construction industry has a significant share in global energy use and environmental problems. It is possible to create sustainable built environments that consume less energy by improving indoor climatic comfort with measures to increase energy efficiency in houses. Considering the housing stock in our country, energy efficient improvements to be made in existing buildings will be as effective as constructing a new low-energy building in terms of efficiency. Registered traditional residences reflecting the identity of cities are also an important part of the existing building stock. In addition to preserving the cultural values of these structures, their energy performance should also be improved. In the study, one of the restored registered houses in the province of Trabzon was selected and energy efficient improvement suggestions were prepared for the outer skin and flooring of the building. These suggestions, which were prepared to increase the thermal insulation performance of the building and to examine the effectiveness of different insulation materials, were examined using the TSE 825 Calculation program. Heat losses were calculated for each space on the ground and first floor of the building. In addition, condensation control was carried out in the same program for the exterior wall alternatives in the study. As a result, insulation recommendations applied in the building with the bağdadi wall construction system have reduced the annual heating loads between 66.8 % and 68.8 %. In January, when the heating load was the highest, a max. of 66.4% savings was achieved in the sample building. As a result of these applications, no condensation problem has occurred in the wall constructions.