How Much Does It Cost to Build a Deck in Ontario? A Homeowner’s Guide for 2026
Building a new deck is one of the best ways to increase your home’s value while creating an outdoor space your family can enjoy for years. One of the first questions homeowners ask is simple: How much does it cost to build a deck in Ontario?
The answer depends on several factors, including the size of the deck, the materials you choose, site conditions, railing systems, stairs, and custom features. In this guide, we’ll break down what affects pricing and help you understand what to expect when planning your project in 2026.
What Is the Average Cost of a New Deck?
Most professionally built decks in Ontario fall within these general ranges:
Pressure Treated Wood Deck
Typical Investment:
$45 to $75 per square foot
Pressure treated lumber remains one of the most affordable decking options. It’s an excellent choice for homeowners looking for durability while keeping initial costs lower.
Composite Deck
Typical Investment:
$80 to $140 per square foot
Composite decking has become one of Ontario’s most popular choices because it requires very little maintenance while offering exceptional longevity and premium aesthetics.
PVC Deck
Typical Investment:
$100 to $160 per square foot
PVC decking offers outstanding moisture resistance, making it an excellent choice for waterfront homes, cottages, and areas exposed to heavy weather.
Exotic Hardwood Decks
Typical Investment:
$150 to $300+ per square foot
Premium hardwoods such as IPE and Cumaru create a truly luxurious outdoor space. These materials provide incredible durability, natural beauty, and a timeless appearance.
What Affects the Cost of a Deck?
Every property is different. Several factors influence the final investment.
Deck Size
Larger decks naturally require more materials and labour. A simple 200 square foot deck will cost considerably less than a custom 700 square foot outdoor living space.
Foundation System
The structure underneath your deck is one of the most important investments.
Depending on your property, your project may require:
- Concrete sonotube footings
- Helical piles
- Engineered foundations
- Elevated framing systems
Proper foundations ensure your deck remains safe and stable for decades.
Railing Selection
Railings significantly affect the overall appearance and budget.
Popular options include:
- Pressure treated wood
- Cedar
- Black aluminum picket railings
- Aluminum and glass railings
- Frameless glass systems
Glass railings create an open, modern appearance but generally cost more than traditional railing systems.
Stairs
Simple stairs are relatively inexpensive.
Multi level stairs, wraparound staircases, landings, and custom lighting increase both labour and material costs.
Premium Features
Many homeowners choose to upgrade their outdoor living space with features such as:
- Privacy walls
- Pergolas
- Integrated deck lighting
- Picture frame borders
- Wide fascia boards
- Built in benches
- Outdoor kitchens
- Covered roof structures
These features transform a deck into a complete outdoor living experience.
Should You Choose Composite or Wood?
Pressure treated lumber offers the lowest initial investment.
Composite decking costs more upfront but provides:
- Minimal maintenance
- Long lasting colour
- Excellent durability
- Outstanding appearance
- Lower maintenance costs over time
Many homeowners find composite decking delivers greater long term value.
Don’t Forget the Structure
A beautiful deck surface is only as good as the framing underneath it.
At Platinum Hill Contracting, we believe the hidden structure deserves just as much attention as the finished product. We build every deck with quality framing, premium fasteners, proper flashing, and attention to detail because that’s what allows your investment to stand the test of time.
Is Building a Deck Worth It?
Absolutely.
A professionally built deck can:
- Increase property value
- Expand usable living space
- Improve curb appeal
- Create the perfect place for entertaining
- Provide years of enjoyment for your family
For many homeowners, it’s one of the best home improvement investments they can make.
Get an Accurate Quote
Every deck is unique. The best way to understand the cost of your project is through a professional consultation.
At Platinum Hill Contracting, we take the time to understand your vision, evaluate your property, and recommend the right materials and design for your budget. Whether you’re planning a pressure treated deck, premium composite installation, hardwood deck, or complete backyard transformation, we’ll help you build it the right way.
Start Planning Your Dream Deck Today
If you’re considering building a new deck in Sharbot Lake, Kingston, or anywhere across Ontario cottage country, we’d be happy to help.
Contact Platinum Hill Contracting today for a personalized consultation and discover what’s possible for your outdoor living space.
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