Why Decks Cost More in Ontario Than the National Average
Frost-depth footings, permits and material choice push Ontario deck costs above the typical range — here's where the extra money goes.
A mid-range deck in Ontario typically runs $21,000 – $35,100, with a typical job landing around $27,000 — noticeably above the basic-tier price of $17,000 you'll see quoted for simpler builds elsewhere. The gap isn't padding. It comes down to three things that are bigger line items here than in most of the country: frost-depth footings, permit and inspection requirements, and the material mix homeowners actually choose.
Frost footings are the biggest hidden cost
Ontario's building code requires deck footings to extend below the frost line, which in most of southern Ontario means digging to around 1.2 m (4 ft) — deeper again in parts of Eastern and Northern Ontario. A deck in a milder climate can often get away with a shallower footing or a surface-mounted pier. Here, every post needs a properly sized, code-depth concrete footing, which means more excavation, more concrete, and more labour hours before a single board of decking goes down.
This cost scales with the deck itself. A ground-level deck on a short run of footings is manageable. A raised deck off a second-storey walkout — common on homes built on a slope or over a walkout basement — needs taller, more heavily reinforced footings and posts rated for the extra load, which is a large part of why a second-storey deck prices out well above a ground-level one of the same size.
Permits add time and cost that the national guide figure doesn't show
Most Ontario municipalities require a building permit for a deck that's attached to the house, more than about 60 cm (24 in) off grade, or over a certain size — the thresholds vary by municipality, so check locally before you budget. A permit means a site plan, an inspection of the footings before they're backfilled, and often a second inspection once the structure is framed. Contractors build the time for scheduling inspections into their quotes, and a job that fails an inspection because a footing wasn't deep enough can mean breaking out and redoing concrete work. This is one of the clearest cases where paying for an established, permit-savvy local contractor is cheaper in the long run than chasing the lowest bid.
Material choice moves the price as much as size does
| Material | Typical | Usual range | Lifespan |
|---|---|---|---|
| Pressure-treated pine | $18,400 | $14,400 – $23,900 | 15-20 years |
| Composite | $27,000 | $21,000 – $35,100 | 25-30 years |
| Western red cedar | $27,500 | $21,400 – $35,700 | 15-20 years |
| PVC (cellular or capped polymer) | $33,200 | $25,900 – $43,100 | 30-50 years |
| Ipe (tropical hardwood) | $37,900 | $29,500 – $49,200 | 30-50 years |
Pressure-treated pine remains the budget default for Ontario decks and is what drives most quotes toward the basic end of the range. Cedar costs more up front but is a popular step up for homeowners who want a warmer look without the maintenance cycle of a fully painted or stained softwood deck — a mid-size cedar deck typically prices around $27,500. Composite decking costs more again, at roughly $27,000 for the same size, but needs no annual oiling or staining, which matters in a climate with harsh freeze-thaw cycles that are tough on finishes. At the top end, ipe and other tropical hardwoods push costs higher still and are a smaller share of the Ontario market.
Railing is another place the Ontario climate shows up in the price. Ontario's code requires guards on any deck more than about 60 cm above grade, so railing isn't optional on most raised decks the way it might be on a low ground-level build elsewhere. Aluminium picket railing is the common mid-range choice; glass balustrades cost more but are increasingly requested on decks with a view worth protecting.
What this means for your quote
If you're comparing a quote against a national cost guide figure and it looks high, check these three things before assuming you're being overcharged:
- Footing depth and count. Ask how many footings and how deep — a deck with more posts than you expected usually reflects frost-depth code, not upselling.
- Permit and inspection fees. These should be itemized separately from labour, and the municipality's own fee schedule is a quick way to sanity-check them.
- Material and railing spec. Pressure-treated pine with aluminium railing and cedar with glass balustrades can be the same footprint and a very different price.
A contractor's written quote should break out footings, framing, decking material, railing and permit costs separately — if it doesn't, ask for that breakdown, or run it through our "is my quote fair" tool to see how it compares with what similar decks are costing in Ontario right now.
For the full national cost breakdown by tier and size, see our Deck building. If frost-depth footings have you wondering about your home's foundation more broadly, our Foundation repair explains how the same frost movement that sizes a deck footing can also affect a foundation over time.