Bulk density, matrix density, total open porosity, compressive and bending strength, water absorption coefficient, apparent moisture diffusivity, water vapour diffusion coefficient, thermal conductivity and specific heat capacity of lime plaster with metakaolin admixture are determined in the paper. Comparative measurements with common lime plaster are done as well. Mechanical properties are significantly better compared to the reference lime plaster, its hygric and thermal properties are mostly similar or slightly improved.