The aim of the master´s project is to provide designs for building permission for a nearly zero-energy veterinary clinic. It is a detached building with two aboveground floors. There are three clinics, one operating rooms, laboratory and staff facilities in the building. First part presents the design of building structure, The superstructure is based on strip foundations made of reinforced concrete in combination with pre-cast permanent formwork made of concrete blocks. The structural system is designed as a masonry system from clay masonry with columns from reinforced concrete. The external walls are load-bearing and covered with thermal insulation and ventilated facade. The floor and roof bearing structure is made of prefabricated concrete slabs. The building is covered with a warm flat green roof. Second part includes the design of building services as lighting, heating, heat recovery ventilation unit. These processes are together shown in a global scheme. Third part is focused on Life cycle assessment of three different flat roof assemblies to compare how they affect the environment. It uses a functional unit 1m2 of a flat roof to define parameters and show how big impact they have on the environment. The project was elaborated using Revit, AutoCad, Deksoft, Building design, GaBi a Lumion software.