Spring is when GTA homeowners start pricing decks, and it’''s also when the permit confusion starts. Whether you need one, what your footings have to do, and whether composite is actually worth the premium – these are the questions that get vague answers from contractors who want to get moving and skip the paperwork.
When you need a permit – and what most people get wrong
In Toronto, a building permit is required if your deck is attached to the house (any size), higher than 24 inches above grade (any size), or freestanding but larger than 10 square metres (about 108 square feet). Most homeowners assume the size threshold is the main trigger. It isn’''t. Attachment is the trigger. If the deck connects to your ledger board – which most decks do – you need a permit regardless of how small it is.
The other mistake is assuming the rules are the same across the GTA. They’‘‘re not. Toronto’’‘s Zoning By-law 569-2013 is not what Mississauga or Vaughan enforces. A 10 m2 freestanding deck might be permit-exempt in Brampton but require a full accessory structure permit in parts of North York under heritage overlay rules. If you’''re outside Toronto proper, confirm with your municipality before starting, not after.
Permit fees typically run $150-$400. Processing takes 10-20 business days depending on the season and municipality. That timeline matters: contractors who tell you they can “start next week” on a permitted job either have it already in the pipeline or are planning to skip the permit.
The footing problem
Footings are the part of a deck quote that gets glossed over the most. In the GTA, the Ontario Building Code requires footings to extend at least 1.2 metres (4 feet) below finished grade to get below the frost line. When footings are poured too shallow, too narrow, or on disturbed soil, the deck looks fine for a few seasons, then starts heaving or listing as freeze-thaw cycles do their work. It’''s the most common structural failure point in decks that otherwise appear solid.
The footer inspection happens after footings are poured but before framing begins. The inspector needs to see the footings before they’‘‘re covered up. If a contractor is vague about when inspection happens in relation to framing, that’’‘s the question to ask directly: “When does the inspector come in, and do you wait for approval before you start the frame?” You shouldn’''t have to prompt them to get this right, but it happens.
Wood vs. composite: what the 25-year math says
Pressure-treated wood costs $25-$35 per square foot installed in the GTA in 2026. Composite (Trex, Fiberon, TimberTech) runs $42-$75. Cedar sits between at $30-$45.
On a 200-square-foot deck, the upfront gap between PT wood and composite is roughly $3,500-$8,000.
Pressure-treated wood needs staining or sealing every 2-3 years. Professionally done, that’‘‘s $3-$5 per square foot per round – around $600-$1,000 per maintenance cycle on a 200-square-foot deck. Over 25 years, that’’'s $5,000-$8,000 in maintenance alone, before any board replacements from checking, cupping, or rot.
Composite has a 25-year warranty on most products and needs almost no maintenance beyond cleaning. The break-even against PT wood is typically 7-8 years. For anyone planning to stay in the house more than a decade, composite is usually the cheaper option by the time you run the full numbers, despite the higher starting price. Cedar looks better than PT wood but requires the same maintenance schedule, so the long-term calculus doesn’''t shift much.
2026 GTA price ranges
A basic 200 sq ft pressure-treated wood deck comes in around $6,000-$9,000 installed. The same footprint in composite: $10,000-$16,000. Larger decks (400 sq ft) range from $12,000-$32,000 depending on material, railing system, stairs, and whether you’''re adding lighting or built-in seating. Those numbers are for a straightforward ground-level or single-level elevated deck. Multi-level builds or anything with a complicated access point push well past the top of those ranges.
What a complete quote should cover
A complete quote for a permitted deck should specify: permit application and fees; footing design and material (concrete tube forms are standard; helical piers cost more but are sometimes necessary on problem soil); structural lumber or composite materials with brand and grade named; railing system with post height and baluster spacing (OBC requires 36" railings for decks higher than 24" above grade, 42" above 1.8m); stairs with riser and tread dimensions; hardware and fasteners (stainless or hot-dipped galvanized for anything near the ground); and disposal of all site waste.
If a quote doesn’‘‘t specify railing height against code, or doesn’’'t say when the inspection falls in the sequence, ask before you sign. Those are the gaps where surprises land.
What material are you leaning toward, and what’''s driving the decision – upfront budget, long-term maintenance, or something else?
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