Practically speaking, no. While you might see “DIY kits” for backyard workshops, building a commercial retail store is a legal and logistical leap. In Canada, commercial buildings require certified trades for electrical, plumbing, and concrete work to pass inspection.
Additionally, most municipalities will not issue a building permit for a commercial structure without a General Contractor listed who carries valid liability insurance. Attempting a DIY commercial build often leads to being uninsurable and failing occupancy inspections.