How much does waterproof stucco coating cost per square foot in Ottawa?

Waterproof stucco coatings in Ottawa typically cost between $2.50 and $5.50 per square foot applied, which includes surface preparation, the coating itself, and labour. For a standard Ottawa home with 1,500–2,000 square feet of stucco wall area, that works out to roughly $3,750 to $11,000 for the complete job. These prices sit about 10–12% below what you'd pay in Toronto, reflecting Ottawa's lower labour overhead.

Types of waterproof coatings and what they cost

Not all waterproof coatings are created equal, and the right choice for your Ottawa home depends on the condition of your stucco and what you're trying to achieve:

• Penetrating silane/siloxane sealers: $2.50–$3.50/sq ft. These soak into the stucco and repel water without changing the appearance. They're the most affordable option and work well on stucco in good condition. They typically last 5–8 years before reapplication.- Elastomeric waterproof coatings: $3.50–$5.50/sq ft. These are thick, flexible coatings that bridge hairline cracks up to 1/16". They're the gold standard for Ottawa because they handle our extreme temperature swings (–30°C to +35°C) without cracking. Brands like Sto, Dryvit, and Parex offer excellent elastomeric products. Expect 10–15 years of protection.- Acrylic waterproof coatings: $3.00–$4.50/sq ft. A middle-ground option — more protective than sealers, less expensive than full elastomerics. Good for stucco in decent shape that just needs an extra layer of weather protection.

The prep work is where costs can vary significantly. If your stucco has:

• Minor surface cracks: add $0.50–$1.00/sq ft for crack filling- Efflorescence or mould: add $0.75–$1.50/sq ft for cleaning and treatment- Failed previous coatings that need removal: add $1.50–$3.00/sq ft

Ottawa's climate makes waterproofing particularly important. Our freeze-thaw cycles — sometimes 20 or more per winter — drive moisture into micro-cracks where it expands as ice, gradually breaking down the stucco from the inside. A good waterproof coating prevents this cycle entirely.

The best time to apply is between June and September when you can count on warm, dry conditions for proper curing. Most coatings need 48–72 hours without rain after application. Get quotes from at least three contractors and ask specifically what product they use, how many coats, and what warranty they offer on their workmanship.

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Looking for experienced contractors? The Ottawa Construction Network connects Ottawa homeowners with qualified professionals:

• 613Bins
• RenoMotion Inc.
• Elie The Carpet Guy Inc.
• ARTEXPRO Tile & Finishes
• Titley Construction

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