How much does it cost to stucco a sunroom addition in Kanata South?

Stuccoing a sunroom addition in Kanata South is a very manageable project compared to a full home re-stucco, and the cost will depend on a handful of factors specific to your addition's size, height, and the system you choose.

What Drives the Cost of Stuccoing a Sunroom Addition

The wall area is the starting point for any estimate. A typical sunroom addition in Kanata South might have anywhere from 200 to 600 square feet of exterior wall surface, depending on whether it's a modest three-season room or a larger four-season structure. Measure the perimeter of the addition and multiply by the wall height — then subtract window and door openings, which are usually significant on a sunroom. Don't be surprised if your actual stuccable surface is 30 to 40 percent less than the gross wall area once you account for all that glazing.

For traditional three-coat Portland cement stucco, Ottawa 2025–2026 pricing runs $8 to $14 per square foot installed. On a 300 square foot wall area, that puts you in the $2,400 to $4,200 range. If you opt for acrylic stucco, which is actually a smart choice for Kanata South given the neighbourhood's exposure to west and northwest winds off the Greenbelt corridor, expect $10 to $16 per square foot — so roughly $3,000 to $4,800 for the same wall area. Acrylic's added flexibility makes it more resistant to the hairline cracking that Ottawa's 50-plus freeze-thaw cycles cause every winter.

EIFS (Exterior Insulation and Finish Systems) is worth considering if your sunroom is a four-season space, because the rigid foam layer adds meaningful thermal performance to what is often the weakest thermal link in a home addition. EIFS runs $12 to $22 per square foot in Ottawa, so a 300 square foot wall area would cost $3,600 to $6,600. Be aware that adding EIFS to a building envelope change typically requires a building permit through the City of Ottawa — this is one of the few stucco scenarios where a permit is mandatory, so factor in that step.

The substrate your sunroom was built with also matters. If the framing is already sheathed with OSB or plywood and has a proper weather-resistive barrier, the contractor can move straight to lath and scratch coat. If the substrate needs remediation or the WRB is missing or inadequate, add $500 to $1,500 to your estimate for prep work.

Timing is important in Kanata South as it is everywhere in Ottawa. Stucco application needs sustained temperatures above 5°C, which means your window is May through October. If your addition was just completed and you're reading this in late fall, a temporary protective coating can buy you time until spring — but don't leave raw substrate exposed through an Ottawa winter. Kanata South also sits outside any heritage conservation district, so no heritage permits are required here, which simplifies the process.

For a project this size, get at least three written quotes from contractors who can assess the substrate condition in person. Pricing on small addition jobs can vary significantly because some contractors prefer larger whole-home projects and may price smaller jobs at a premium, while others specialize in exactly this kind of focused exterior work.

You can browse stucco contractors serving the Kanata area through the Ottawa Construction Network directory at justynrookcontracting.com — it's a free resource to find and contact local contractors directly and compare your options before committing.