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How much does a new deck cost in St. Thomas, ON?

Converted from US national rangeUpdated Prices checked October 20262 sources

A new deck costs about CA$6,100 to CA$17,780, typical CA$11,690, using the US national range converted to Canadian dollars. That is HomeAdvisor's US figure ($4,338 to $12,653) at 1.4054 CAD per USD (Bank of Canada, October 20, 2026), not a survey of St. Thomas prices.

Converted to Canadian dollars

Low
CA$6,100
Typical
CA$11,690
High
CA$17,780

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Deck building cost in St. Thomas, ON

Each row says exactly what the figures are and where they come from.

Deck building cost in St. Thomas, ON
EstimateLowTypicalHighBasisChecked
Converted to CADCA$6,100CA$11,690CA$17,780US national range × 1.4054 CAD per USD (Bank of Canada, October 20, 2026). Not a survey of St. Thomas pricesOctober 2026
US national range$4,338$8,321$12,653Per deck: typical range of customer-reported projects (HomeAdvisor)October 2026

Deck building cost by type or size

US national figures in USD, as published by each source.

Deck building cost by type or size
Type or sizePrice (USD)Source
10 × 10 ft (100 sq ft)$4,000 to $6,000HomeAdvisor
20 × 20 ft (400 sq ft)$16,000 to $24,000HomeAdvisor

What drives the cost of a new deck

Dollar figures in this section are US national figures in US dollars.

  1. Size and height

    Second-story and multi-level decks need more structure.

  2. Decking material

    Pressure-treated wood runs $2 to $5 per sq ft; composite $12 to $22.

  3. Labor

    Labor runs $15 to $35 per sq ft.

  4. Railings and stairs

    Railings cost $35 to $210 per linear foot.

  5. Old deck removal

    Demolition runs $5 to $15 per sq ft.

  6. Season

    Off-season work can be up to 20% cheaper.

Permits and what's included in St. Thomas

Fees quoted here are US figures in US dollars; Canadian permit fees are set by your municipality.

Permit note

Most places require a deck permit, typically $230 to $500 depending on location, size and height.

Rules are set locally; confirm with St. Thomas’s building department.

What’s usually included

  • Footings and framing
  • Decking boards
  • Railings and stairs in the agreed design
  • Installation labor

Scopes vary. Get the scope in writing on every quote.

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Top-ranked deck builders in St. Thomas

The top 3 of 75 deck builders we rank for St. Thomas, ON, by CR Score. Paid placement never changes rank.

  1. #1
    Creative Custom Decks Inc.
    CR Score 615.0from 72 Google reviews
  2. #2
    London Fence & Deck
    CR Score 594.8from 46 Google reviews
  3. #3
    Geerlinks Home Hardware Building Centre
    CR Score 574.4from 916 Google reviews

See all ranked deck builders in St. Thomas

Deck building cost in St. Thomas: questions

How much does a new deck cost in St. Thomas, ON?

A new deck costs about CA$6,100 to CA$17,780, typical CA$11,690, using the US national range converted to Canadian dollars. That is HomeAdvisor's US figure ($4,338 to $12,653) at 1.4054 CAD per USD (Bank of Canada, October 20, 2026), not a survey of St. Thomas prices.

Are these prices in Canadian dollars?

Yes, converted. We have no Canadian price survey for this job, so we show the US national range converted at 1.4054 CAD per USD (Bank of Canada daily rate for October 20, 2026). Local labour, material and tax differences are not reflected.

Do I need a permit for a new deck in St. Thomas?

Most places require a deck permit, typically $230 to $500 depending on location, size and height. Rules are set locally, so confirm with St. Thomas’s building department. Dollar figures here are US figures in US dollars.

What affects the cost of a new deck?

Size and height: second-story and multi-level decks need more structure. Decking material: pressure-treated wood runs $2 to $5 per sq ft; composite $12 to $22. Labor: labor runs $15 to $35 per sq ft. Railings and stairs: railings cost $35 to $210 per linear foot. Dollar figures here are US figures in US dollars.

How many deck builders serve St. Thomas?

We rank 75 deck builders for St. Thomas, ON by CR Score. Get at least three written quotes for the same scope.

What is usually included in the price?

Footings and framing; Decking boards; Railings and stairs in the agreed design; Installation labor. Always get the scope in writing on the quote.

Sources

Checked October 2026. Figures are estimates, not quotes.

  1. HomeAdvisor: Deck building cost · page updated June 17, 2026 · checked October 2026Primary source. Used for: Low, typical and high; prices by size; drivers; permit.
  2. Journal of Light Construction: 2025 Cost vs. Value Report: Deck Addition, Wood · page updated 2025 · checked October 2026Used for: Regional adjustment ratio.
  3. Bank of Canada: Daily exchange rates (USD/CAD) · page updated October 20, 2026Used for: Conversion rate 1.4054 CAD per USD.
These are published estimates converted at a stated exchange rate, checked October 2026. They are not quotes. Typical range shown: CA$6,100 to CA$17,780. Editorial policy

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