CONSTRUCTION TYPE The Building Code classifies buildings into different construction types according to the materials and methods used in the structure. There are five main types, labeled with roman numerals I-V. Within these types there are non-rated vs. 1-hour rated construction in types II, III, and IV, and "fire resistive" classes of types I and II. Type V is typically wood frame construction, Type IV is heavy timber, type III is a hybrid, type II is concrete or non-combustible construction, and Type I is used for high rises. Each type has specific maximum square footages allowed under each occupancy as well as maximum height and number of stories. Since most live/work renovations are a change of use, one needs to closely observe the requirements for construction type laid out in Tables 5-B and 6A of the U.B.C. It can be crucial in determining the character of the building and its feasibility for renovation.