The aim of the thesis is to design a passive house constructed using the box beams based on wood. Design of the envelope constructions based on wood and their thermo-mechanical properties related to a passive house are mentioned in the thesis. Design of silicate constructions are described and compared to constructions based on wood in the thesis as well. Designed constructions based on wood are used in drawing guidance documents of a passive family house. Documents are prepared in a form of planning permission.