Professional, member of the Ordre des architectes du Québec, whose practice includes the analysis, design or advice relating to the construction, expansion or modification of a building as well as the related coordination activities. The architect's interventions aim to make the building sustainable, functional and harmonious, whether through its location, its envelope, its interior design or its materials. According to the Architects Act, the use of an architect is mandatory , among other things, for the design of plans and specifications for a building of more than four units (dwellings), more than two storeys or more than 300 m2 of total gross floor area (the basement is not considered as a floor and is not counted in the area). In addition, the supervision of the work within its scope of practice must be carried out by the architect.