The bachelor thesis deals with the problems of thermal insulation, which are curren-tly used in wood-building constructions for energy-efficient construction. It compares the thermal insulation properties of conventional industrially produced insulation materials and alternative materials. They compare the properties of materials from wood, animal origin, grown plants and petroleum products. It points to the differences between insulation based on thermal conductivity coefficients with an impact on their required thickness to meet the stan-dard after 2020. The aim of the work was to achieve real cost costs per m2 of perimeter wall construction for various thermal insulating materials. The work also points to the most used thermal insulating materials in woodworking structures that are currently available on the market.