Deck Building in Ottawa

What does deck building in Ottawa include?

A deck project covers permit drawings and application when required, footings dug and poured below Ottawa’s frost depth, pressure-treated framing, your choice of decking material — pressure-treated wood, cedar, composite, or PVC — railings and balusters to code, stairs with proper rise and run, and optional features like privacy screens, built-in benches, or low-voltage lighting. One contractor handles the permit, the structure, and the finish so the deck is ready for furniture when we leave.

How is deck building priced?

Decks are quoted per square foot because area and height above grade drive both material quantities and labour intensity. The three tiers on this page — pressure-treated wood, composite or PVC, and covered or multi-level — show typical Ottawa ranges verified September 2026, before HST, and height above grade moves a project within its tier. A ground-level deck sits close to the ground, needs shorter posts, simpler stairs, and less railing, so it lands at the lower end of the range. An elevated deck more than 600 mm above grade requires deeper footings below the frost line, taller posts, more complex framing to handle the cantilevered load, taller railings with balusters spaced to code, and often a building permit, which adds cost and time. Multi-level decks with steps between levels or covered decks with a roof structure add significant complexity: more framing members, more connections, and sometimes an engineer’s stamp if the spans are long or the roof is attached to the house. After a site visit we measure the footprint, confirm the height above grade and the features you want — privacy screens, benches, planters, lighting, pergola beams — and send a fixed line-item quote. We quote the decking material — pressure-treated wood, cedar, composite, or PVC — as alternatives on the same footprint so you can compare first cost, maintenance, and longevity side by side and choose what fits your budget and timeline.

Why do deck footings need to go so deep in Ottawa?

Frost penetrates deep into Ottawa soils, and the clay we build on heaves when it freezes. A footing that sits above the frost line lifts and drops each winter, which racks the framing and opens fasteners. We place footings below the frost line — typically 1.2 metres or deeper depending on the deck’s load — and size them so the bearing surface spreads the weight. That extra depth is not optional; it is the only way a deck stays level through ten winters.

Do I need a permit to build a deck in Ottawa?

A permit is required when a deck is attached to the house and more than 600 mm above grade, serves as the principal entrance, or is freestanding, more than 10 square metres in area, and more than 600 mm high. The City quotes a first review turnaround of 5 business days. We prepare the drawings, submit the application, and schedule the inspection. A ground-level deck under 600 mm and under 10 square metres usually does not need a permit, but we confirm that during the site visit. Source: ottawa.ca, checked 2026-09-19.

Wood, composite, or PVC — which should I choose?

Pressure-treated wood costs the least per square foot, accepts stain or paint if you want colour, and needs sealing or staining every two to three years to resist weathering, splitting, and grey-out. It is the go-to choice for framing and for deck boards when budget is the priority. Cedar looks warmer and smells better out of the gate, weathers naturally to a silver-grey if left unsealed, resists rot better than treated pine, and costs more than treated but less than composite — a middle ground for homeowners who want real wood with less maintenance than paint. Composite decking — typically wood fiber and plastic — costs significantly more up front, resists rot and insects, holds colour better than wood, and needs only periodic washing with soap and water instead of sealing or staining. It does fade slightly over the first year or two and can get hot underfoot in direct sun. PVC decking is fully synthetic, costs the most, and is the lowest-maintenance option: no fading, no rot, no splinters, and it stays cooler than composite. The trade-off is first cost and the feel underfoot — some people prefer the warmth and texture of real wood. We quote all the options side by side with the same framing and railing cost itemized separately, so you can compare first cost, expected maintenance over ten years, and warranty terms, then choose what fits your budget, your timeline, and how much you want to be back on a ladder with a roller every few summers.

When is deck season in Ottawa?

Footings can go in as soon as the ground thaws, typically late April, and decks are built through the fall. Pressure-treated framing can handle cold weather, but we avoid pouring footings once frost is back in the ground. Spring and early summer slots fill first, so an enquiry in winter usually secures a better start date than one in June.

A deck is only as good as its footings. We dig below the frost line and size the bearing surface for the load, because a beautiful deck on shallow footings is a repair job waiting to happen.