6. A professional technologist may engage in a professional activity reserved to architects when it relates to(1) a detached single-family dwelling unit;
(2) the insertion of a single and non-repetitive single-family dwelling unit between existing attached dwellings or the addition of such a dwelling unit at their extremity; or
(3) the enlargement or alteration of a semi-detached or attached single-family dwelling unit.
The buildings referred to in the first paragraph must, after the work is completed, have no more than 1 basement storey, a building height not exceeding 3 storeys and a building area of less than 600 m2.