Regardless of the deck’s walking surface area, if the deck is adjacent to or attached to the house and its walking surface is more than 600 mm (24 in.) above the adjacent grade, a permit is required.
Regardless of the deck’s walking surface area, if the deck is an elevated deck providing principal access to a building a permit is required.
If the deck is independent from the house (eg. is in the middle of the yard) and has a walking surface greater than 10 square metres (approximately 108 square feet) in area and its walking surface is more than 600 mm (24 in.) above the adjacent grade, a permit is required.