Adding a deck is one of the most popular upgrades for homeowners in London, Ontario. It boosts property value, expands living space, and creates the perfect spot for entertaining. But how much does it actually cost to build a deck in 2025?
On average, homeowners in London pay $30–$65 per square foot installed, depending on materials, design, and features. That means a 300 sq. ft. deck could range anywhere from $9,000 to $19,500.
Here’s a detailed breakdown of what affects pricing.
Average Deck Installation Costs in London Ontario (2025)
| Material | Cost per Sq. Ft. (Installed) | Notes |
|---|---|---|
| Pressure-Treated Wood | $30 – $45 | Most affordable, classic look, requires staining/sealing |
| Cedar Wood | $40 – $55 | Rich color, more durable than pressure-treated |
| Composite | $55 – $75 | Low-maintenance, long lifespan, modern look |
| PVC / Vinyl | $60 – $80 | Highly durable, fade-resistant, premium option |
Factors That Affect Deck Cost
Deck Size
- Small (200 sq. ft.): $6,000 – $12,000
- Medium (300–400 sq. ft.): $9,000 – $24,000
- Large (500+ sq. ft.): $15,000+
Design Complexity
- Simple rectangular decks are cheapest.
- Multi-level decks, angled layouts, and built-in features increase labour costs.
Material Choice
- Wood is cheaper upfront but needs staining and sealing.
- Composite/PVC cost more but last 20–30 years with little maintenance.
Labour Costs
- Average labour in London runs $15–$25 per sq. ft. depending on design complexity and site access.
Chart: Common Deck Add-On Costs
| Feature | Typical Cost | Notes |
|---|---|---|
| Stairs (per set) | $500 – $2,000 | More for wide or multiple sets |
| Railings (per linear ft.) | $40 – $120 | Depends on wood, aluminum, glass |
| Pergola or Shade | $2,500 – $6,000 | Adds comfort and style |
| Lighting | $500 – $2,500 | In-deck or railing lighting options |
| Built-in Seating | $1,000 – $3,500 | Adds convenience and aesthetics |
Long-Term Costs: Wood vs Composite
Wood decks cost less at first but need maintenance every 2–3 years:
- Staining/sealing: $300–$700 per treatment
- Replacement boards: $5–$10 per sq. ft.
Composite and PVC decks cost more upfront but almost nothing in upkeep, making them cheaper in the long run.
Permits in London Ontario
For most decks, you’ll need a building permit if the deck is:
- Over 2 ft. (0.61 m) above grade
- Attached to the house
- Includes a roof or covering
Permit fees typically range from $200–$350, depending on deck size and construction value.
Final Word
In London, Ontario, 2025 deck installation costs range from $30–$65 per square foot, with total prices usually falling between $9,000 and $19,500 for a mid-sized deck.
Wood decks are affordable but require maintenance. Composite and PVC decks cost more but pay off with long-term durability and low upkeep.
If you’re budgeting for a deck this year, consider not just the upfront cost but the lifetime value. Done right, your deck will add comfort, style, and resale value to your home for years to come.