Building a deck is one of the most popular ways to enhance your home’s outdoor living space. Whether you’re planning a simple platform deck or a custom multi-level design, understanding the costs involved is essential for budgeting and making informed decisions. In Ontario, the total expense depends on several factors including size, materials, design complexity, and labor.

This post breaks down the average costs, key price influencers, and what you need to consider before starting your deck project.

Table of Contents

Average Cost to Build a Deck in Ontario
What Affects Deck Building Costs?
Popular Deck Materials and Their Price Ranges
Additional Costs to Consider
How to Get an Accurate Quote
Key Considerations Before Building Your Deck

Average Cost to Build a Deck in Ontario

On average, building a deck in Ontario costs between $25 and $50 per square foot, including materials and labor. This means a typical 200-square-foot deck can range from $5,000 to $10,000.

Here’s a rough breakdown by deck size:

Small deck (100–150 sq. ft.): $2,500 – $7,500
Medium deck (200–300 sq. ft.): $5,000 – $15,000
Large deck (400+ sq. ft.): $10,000 – $25,000+

Keep in mind these are ballpark figures. The final price depends on many factors discussed below.

What Affects Deck Building Costs?

Several factors influence how much your deck will cost to build, including:

Deck Size: Larger decks require more materials and labor, naturally increasing total costs.

Materials: The choice of decking material can significantly impact your budget. Pressure-treated wood is the most affordable, while composite and hardwood options tend to cost more upfront but offer increased durability.

Design Complexity: Multi-level decks, built-in seating, stairs, and custom railings add to both materials and labor costs.

Labor Rates: Labor costs vary across Ontario, especially between urban and rural areas.

Permits and Inspections: Depending on local regulations, you may need permits, which can add to costs and extend the project timeline.

Popular Deck Materials and Their Price Ranges

Choosing the right materials is key to balancing cost and longevity. Here are some common options:

Pressure-treated wood: $15 – $25 per sq. ft. (most affordable)
Cedar or redwood: $25 – $40 per sq. ft. (natural resistance to rot)
Composite decking: $30 – $50 per sq. ft. (low maintenance, long-lasting)
Exotic hardwoods: $40+ per sq. ft. (premium option)

Additional Costs to Consider

Beyond the basic deck build, there may be extra costs to plan for:

Railings: Depending on style and material, railings can add $20 to $50+ per linear foot.
Stairs: Adding stairs will increase both material and labor expenses.
Lighting and Electrical: For built-in lighting or electrical outlets, budget accordingly.
Site Preparation: Uneven or sloped terrain may require grading or retaining walls, which will add to the project cost.

How to Get an Accurate Quote

For the most accurate estimate, contact local deck builders with your project details. A professional contractor will assess your site, discuss design preferences, and provide a detailed estimate that includes all materials, labor, and permits.

What You Should Know

Before starting your deck project, it’s important to consider several key factors that can impact your budget, timeline, and overall satisfaction. Understanding these elements will help you make informed decisions and avoid unexpected costs.

Here are some important points to keep in mind:

Budgeting: Know your price range and allocate funds for materials, labor, permits, and additional features like railings or lighting.
Material Choice: Select decking materials that balance cost, durability, and maintenance requirements to fit your lifestyle.
Design Complexity: Keep in mind that custom designs or multi-level decks may increase both cost and installation time.
Professional Help: Hiring experienced contractors ensures proper installation and compliance with local regulations.
Site Preparation: Be prepared for additional costs if your yard requires grading, retaining walls, or other groundwork.

By considering these factors upfront, you can ensure your deck project runs smoothly and delivers the outdoor space you envision.