Deck Building Cost in Ottawa (2026)

In 2026, a permit is required if the deck is more than 600 mm (24 inches) above grade, attached to the house, or larger than 10 square meters (108 sq ft). The minimum permit fee is $117, plus $12.75 for every $1,000 of construction value.

Pressure-treated wood decks typically cost $35–$55 per sq ft installed, while mid-to-premium composite (like Trex or TimberTech) ranges from $65–$95 per sq ft. While composite is roughly 60-80% more expensive upfront, it eliminates the $500–$1,500 annual maintenance costs associated with wood.

Due to Ottawa's severe freeze-thaw cycles, footings must reach below the frost line, which is typically 1.2 to 1.5 meters (4 to 5 feet) deep. Using helical piles instead of traditional concrete sonotubes can add $200–$350 per pile but offers better long-term stability.

Professional deck demolition and disposal in Ottawa currently costs between $5 and $15 per square foot. For a standard 200 sq ft deck, expect to pay $1,000 to $3,000 for full removal, including hauling debris to a local waste transfer station.