cost to replace bay window
Related articles: Replacement Windows, Skylight, Exterior Door. 1  The cost for just the bay or bow window (without installation) starts around $800-$2,000 for a standard version but can run $2,500-$7,000 for a larger or a custom model.2  The price will depend on the size and the materials used.hopping for a bay window: 1  Adding a copper roof on a bay window looks sharp but can cost another $1,500-$3,500 or more. 2  Pre-drawn plans for a bay window addition are available online for $40-$50.