What is the price to remove failing EIFS and replace with traditional stucco in Ottawa?

Removing failing EIFS (Exterior Insulation and Finish System) and replacing it with traditional three-coat stucco on an Ottawa home typically costs $20,000–$45,000, making it one of the most significant exterior renovation investments. The wide range reflects the extent of concealed damage that's almost always found once the EIFS comes off — and that damage is the real cost driver.

Why EIFS-to-Traditional Stucco Conversions Are Expensive

The removal and replacement process involves far more than just swapping one finish for another. Here's a realistic cost breakdown for an average Ottawa two-storey home with approximately 1,800 square feet of wall surface:

• EIFS removal (stripping foam insulation, base coat, mesh, and adhesive down to sheathing): $4–$6 per sq ft — roughly $7,000–$11,000- Substrate repair (replacing water-damaged OSB/plywood sheathing, repairing or replacing rotted studs, treating mould): $3,000–$12,000 depending on damage extent- New weather barrier, metal lath, and traditional three-coat stucco installation: $10–$16 per sq ft — roughly $18,000–$29,000- Window and door re-flashing: $1,500–$3,000 (critical step often underestimated)- Scaffolding: $2,000–$4,500

The substrate repair phase is where budgets get blown. In over two decades of Ottawa winters, failing EIFS has typically allowed moisture to penetrate and sit against the sheathing through countless freeze-thaw cycles. It's common to find 20–40% of the sheathing needs replacement, and in severe cases, structural framing members are compromised. No reputable contractor can give you a firm fixed price for substrate repair until the EIFS is removed and the damage is visible.

Ottawa homes built in the mid-1990s to early 2000s with barrier-type EIFS (no drainage plane behind the foam) are the most problematic. These systems relied on perfect sealant maintenance to keep water out — and perfect maintenance never happens. Water enters at window perimeters, penetrations, and sealant joints, then gets trapped with no way to drain or dry. The newer drainable EIFS systems (post-2005) perform much better, and many of those don't need full replacement.

The Ontario Building Code now requires any stucco or EIFS cladding system on wood-frame construction to include a drainage plane. When converting from EIFS to traditional stucco, your contractor must install a code-compliant rainscreen or drainage system — typically self-furring metal lath over two layers of weather-resistant barrier. This adds cost compared to the old way of doing things but eliminates the moisture trapping problem that caused the EIFS to fail in the first place.

For budgeting purposes, plan on $25,000–$35,000 as a realistic midpoint for a typical Ottawa two-storey home conversion, and hold a 15–20% contingency for unexpected substrate damage. Get a detailed scope of work in writing, confirm your contractor carries WSIB coverage and adequate liability insurance, and ensure the contract addresses how substrate damage discoveries will be handled and priced during the project.

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