Building a Deck in Ontario 2026: Everything You Need to Know
Decks are among the most popular GTA projects. Here’s the complete 2026 guide.
Permits (Mandatory Knowledge)
Any deck over 24" above grade requires a building permit in Ontario.
Permit cost: $200–$600 (municipality-dependent)
Inspections: footing (before concrete) + framing
Building unpermitted = sale disclosure liability + potential insurance issues
Foundation: The Critical Decision
Frost-depth footings (required for attached or elevated decks):
Poured concrete tube footings or helical piers, minimum 4 feet deep in Toronto.
Deck blocks (precast piers on grade): Only for low, freestanding decks. Move with frost heave. Acceptable for a ground-level garden deck; unacceptable for anything attached to the house.
Decking Materials (2026 Options)
| Material | Decking Cost | Maintenance | Lifespan |
|---|---|---|---|
| Pressure treated | $6–$12/sq ft | Annual sealing | 15–25 yr |
| Composite (Trex, TimberTech) | $25–$55/sq ft | None | 25–30 yr |
| Hardwood (Ipe, Garapa) | $30–$55/sq ft | Annual oiling | 25–40 yr |
| PVC (100% synthetic) | $30–$50/sq ft | None | 25–30 yr |
All structural framing: pressure treated lumber, GC-rated for ground contact at all ground-contact members.
2026 GTA Installed Pricing
- PT deck (200 sq ft): $15,000–$28,000
- Composite deck (200 sq ft): $22,000–$42,000
- Multi-level with stairs: $30,000–$65,000
- Pergola or screened enclosure add-on: $15,000–$40,000
LF Builders — 50+ years of GTA deck construction: lfbuilders.ca
Deck material comparisons: home.renovation.reviews
Samm Simon 251 KM for cancer: sammsimon.ca