insurance and finance, financial transactions, real estate, real estate and property management, real estate and mortgage mediation, real estate appraisal, assets administration, leasing residences, sale of houses and residences

construction, installation work, repairs in the construction field, demolition work, sealing work, roofing work, insulation work, electrical installation, furnace construction, tiling, flooring work, building dehumidification, scaffold construction, glazing work, building construction, underground engineering and civil engineering, paving and paneling work, repair and maintenance work on buildings, street and road constructions, installation and assembly of illumination equipment, lightning conductors, grounding equipment, heating,ventilation and air conditioning equipment, refrigeration equipment and of sanitation facilities and equipment, insulating, plumbing work and gas and water installations, painting, lacquering and wallpapering, installing parquet flooring, repairing or maintaining of heating, air conditioning, cooling and ventilation equipment as well as of technical heating equipment, construction of chimneys, stucco and plastering work, carpentry and engineering manufacture of wooden buildings, wooden roof framing, constructing wooden stairs

building and construction planning and consulting, services rendered by an architect, services rendered by an engineer, setting up programs for data processing, drawing up expert technical opinions, technical consulting