Building a Deck in the GTA: 2026 Guide to Permits, Materials, and Costs
A new deck delivers some of the highest returns on investment in GTA renovations. This guide covers Ontario Building Code requirements, material options from PT wood to aluminum, and realistic 2026 pricing.
When You Need a Permit
Ontario requires a building permit for decks that are:
- More than 600mm (24 inches) above grade
- Attached to the house, OR
- Over 10 square metres in area
Permit fees: $200-600 depending on municipality. Plan for inspections at post holes, framing, and final completion. Unpermitted decks are flagged at resale and can void insurance claims.
OBC Structural Requirements
- Footings: Minimum 1.2m (4 ft) depth — below frost line in GTA
- Posts: Minimum 4x4 for low decks, 6x6 for tall structures
- Ledger: Lag screws on 16-inch centres through house cladding to rim joist, with proper flashing
- Guards: 900mm minimum for decks under 1.8m high; 1,070mm for higher decks
- Baluster spacing: Maximum 100mm between members
Decking Material Options
| Material | Lifespan | Maintenance | Cost (installed) |
|---|---|---|---|
| Pressure-treated wood | 15-25 yr | Annual staining | $10-20/sq ft |
| Western red cedar | 20-35 yr | Biannual staining | $18-35/sq ft |
| Composite (Trex, Fiberon) | 25+ yr | Minimal | $30-65/sq ft |
| PVC (AZEK) | 30+ yr | None | $40-80/sq ft |
| Aluminum waterproof | 30+ yr | None | $50-100/sq ft |
Best value for most GTA homeowners: Composite decking with aluminum railing — minimal maintenance, 25-year warranty, strong resale appeal.
Railing Options
- Wood: Traditional, requires maintenance
- Aluminum: Popular, low maintenance, strong, available in many colours
- Glass panels: Premium, maximum view preservation
- Cable railing: Sleek and modern, requires periodic tensioning
2026 Cost Guide
| Project | Cost |
|---|---|
| PT wood deck, 200 sq ft | $8,000-14,000 |
| Cedar deck, 200 sq ft | $12,000-22,000 |
| Composite + aluminum railing, 200 sq ft | $18,000-35,000 |
| Aluminum waterproof system, 200 sq ft | $25,000-50,000 |
Post your deck project and get contractor quotes on home.renovation.reviews.
LF Builders has built decks, patios, and outdoor living spaces across the GTA since 1974. lfbuilders.ca