Standards for exterior siding on a building can vary based on:

• the borough
• the nature of the building (single-family home, semi-detached, multiplex, etc.)
• the use of the building (residential, commercial, etc.)
• the façade on which the work will be carried out (front, rear, or sides of the building)
• neighbouring buildings
• whether or not the building or area has heritage status

Some boroughs have specific requirements for façades directly on the street. In other boroughs, these requirements apply to all façades visible from the street or sidewalk.