Guide
Deck materials compared: pressure-treated, cedar, and composite
Jun 24, 2026 · Ottawa Service Directory · 6 min read
Pressure-treated, cedar, or composite? Each handles Ottawa's freeze-thaw winters differently. A plain-language comparison of cost, upkeep, and lifespan.
Ottawa decks live through a hard freeze-thaw cycle, so the material you pick changes both the upfront cost and the years of upkeep that follow.
Pressure-treated wood
The lowest upfront cost and the most common choice. It holds up well if you re-stain or seal it every couple of years. Skip that upkeep and it greys, checks, and splinters faster in our climate.
Cedar
Naturally rot- and insect-resistant with a warmer look than treated lumber. It is softer, so it dents more easily, and it still needs periodic sealing to keep its colour.
Composite
Highest upfront cost, lowest maintenance. No staining or sealing, and it resists fading and rot. Good composite is engineered for freeze-thaw; ask the builder which line they use and what the warranty covers.
A builder who knows Ottawa will talk about frost-line footings and drainage, not just the boards on top. That structure is what keeps a deck level after a few winters.
Common questions
- Which deck material lasts longest in Ottawa's climate?
- Composite and PVC last longest with the least upkeep because they resist rot and freeze-thaw damage. Cedar and pressure-treated wood can last many years too, but only if you seal or stain them on a regular cycle in our climate. Whichever material you choose, ask the builder about the footings and drainage too, since a deck's structure below the frost line decides how level it stays over time, not just the boards on top.
- Is composite decking worth it over pressure-treated wood?
- Composite costs more upfront but needs no staining or sealing and resists fading and rot, so it often costs less over the deck's life. If you would rather not maintain the deck every couple of years, it is usually worth it in Ottawa. Composite quality still varies by product line, so ask which line the builder uses and what the warranty covers before comparing prices.
- Do I need a permit to build a deck in Ottawa?
- Usually yes for a deck attached to the house or above a set height. The City of Ottawa sets the thresholds, and a reputable builder pulls the permit and books the inspections as part of the job. That requirement holds regardless of material; cedar and composite decks need the same permit as pressure-treated once they meet the height or attachment thresholds.
Want a costed range rather than the drivers? Deck cost calculator for Ottawa works one out from published per-unit figures and shows where each one came from.
Open the calculatorSee the full Deck Builders directory in Ottawa, ranked with ratings and service areas.
Browse Deck Builders