How Much Does a Deck Cost to Build? (Real Prices in Ontario)
- edens20lawncare
- Mar 26
- 2 min read
If you’re thinking about building a deck, one of the first questions you probably have is:
“How much is this actually going to cost me?”
The honest answer—after building decks across Ontario—is this:
It depends. But not in a vague way. It depends on very specific factors that can swing your price by thousands.
In this post, I’m going to break down:
Real deck pricing based on actual projects
What drives the cost up (or down)
Real examples from jobs we’ve completed
What most homeowners get wrong
How Much Does a Deck Cost to Build Real Deck Cost Ranges (Based on Our Projects)
Here’s what we typically see for deck builds in Ontario:
Small decks: $3,000 – $8,000
Medium decks: $8,000 – $12,000
Large / custom / multi-level decks: $12,000+
These are not generic internet numbers—this is based on real builds.
But here’s the key:
👉 Two decks the same size can be thousands of dollars apart.
From experience, these are the biggest cost drivers:
1. Material (This is a big one)
Pressure-treated wood = more budget-friendly
Composite decking = significantly more expensive upfront
Composite looks great and lasts longer, but it can easily double parts of the cost.
2. Railings
Railings are one of the most underestimated costs.
Basic wood railing = cheaper
Aluminum or glass railings = premium
Glass railings especially can add thousands—but they completely change the look of the deck.
3. Stairs & Height
The higher and more complex your deck is, the more it costs.
More stairs = more labor + materials
Multi-level builds = significantly more structure and time
A simple ground-level deck vs. a raised multi-level deck are completely different projects.
Real Deck Examples (From Our Jobs)
🔹 High-End Multi-Level Composite Deck
Composite material
Multi-level design
Glass railings
Custom layout
Final Cost: $28,000
This is a great example of how upgrades stack:composite + multi-level + glass railings = premium build.
🔹 Simple Pressure-Treated Deck
Pressure-treated wood
Lower level
One step up
No railings
This is a clean, functional deck without the extras—much more budget-friendly.
What Most Homeowners Get Wrong
The biggest misconception I hear is:
“How much is a deck per square foot?”
That’s not how it works.
From experience, the price is driven way more by:
Complexity
Height
Railings
Material choice
Two decks could be the exact same size, and one could cost $5,000 while the other is $25,000+.
My Honest Advice Before You Build
If you’re planning a deck, here’s what I always tell clients:
Decide early if you want composite or wood
Think about railings (they add up fast)
Keep the design simple if you’re on a budget
Don’t underestimate stairs or multi-level layouts
And most importantly:
👉 Have a realistic budget based on what you actually want—not just size.
Final Thoughts
So, how much does a deck cost to build?
Basic decks can start around $3,000–$5,000
Most homeowners land in the $8,000–$12,000 range
Custom decks can easily reach $20,000+
It all comes down to how complex you want to go.
If you’re in Ontario and want a real quote based on your space, feel free to reach out—happy to help you plan it properly from the start.
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