How much does it cost to stucco around a new bay window installation in Ottawa?

Stuccoing around a bay window is one of those jobs where the complexity per square foot is dramatically higher than a flat wall. Between the multiple angles, return walls, soffits underneath, and the critical flashing details at the top, it's detail-intensive work that takes time to do properly.

Bay Window Stucco Costs in Ottawa

For stuccoing around a newly installed bay window, Ottawa homeowners typically pay $2,500 to $6,500 for the stucco work alone (not including the window itself or the framing). This assumes a standard three-panel bay window with a 2–3 foot projection and includes all the stucco, trim details, and flashing integration.

Here's how that breaks down:

• Side return walls (the angled cheeks): $20–$32/sq ft — these are small areas but awkward to apply and finish, requiring careful corner bead work at each angle change- Underside soffit (if stuccoed rather than wood or vinyl): $25–$38/sq ft — overhead stucco application is slow, physically demanding work that requires experienced hands- Wall patches above and below the bay window: $16–$26/sq ft for blending new stucco into the existing wall surface- Corner beads and trim profiles: $8–$14/linear foot for all the edges where stucco meets window frame or changes angle- Head flashing and integration: $300–$800 depending on the flashing design. This is the single most important detail — a bay window's top ledge collects water from the wall above, and without proper step flashing and kickout, that water goes straight into the wall cavity

The flashing detail at the top of a bay window deserves special emphasis. In Ottawa, where ice can form on that horizontal ledge and back up under the stucco above, the head flashing needs to extend at least 4 inches up behind the weather barrier and include a drip edge that projects past the face of the stucco below. This is where many installations fail — and where water damage begins within 3–5 years. Budget an extra $200–$500 for a properly fabricated custom head flashing rather than accepting a generic bent piece of aluminum.

A few additional cost factors specific to Ottawa:

• Texture matching: If you're adding a bay window to an existing stuccoed wall, matching the surrounding texture adds 15–25% to the stucco costs. This is especially true for older Ottawa homes with hand-applied textures that modern spray methods can't replicate.- Scaffolding: If the bay window is on the second storey, add $400–$800 for scaffold setup. Bay windows require access from multiple angles, so scaffolding needs are greater than for flat wall work.- Season: Stucco application requires sustained temperatures above 5°C for proper curing. If your window installation happens in late fall, the stucco work may need to wait until spring — plan accordingly so the wall isn't left open to Ottawa's winter weather.

Get a contractor who will show you their flashing plan before starting. The $3,000–$6,000 you spend on proper stucco work is protecting a $4,000–$10,000 window investment, so cutting corners here is false economy.

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

• Justyn Rook Contracting
• RenoMotion Inc.
• ALM Construction & Landscaping Inc.
• The Next Reno
• Humble Homes - property maintenance

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