About OnlyPane

OnlyPane is an independent home-improvement cost-research site. We gather pricing data for replacement windows and exterior doors from manufacturers, contractor cost databases, and consumer research, then present it as plain-English ranges and an interactive calculator.

We are not a contractor, manufacturer, or lead broker. Our goal is to help homeowners walk into a quote conversation already knowing the fair range for their project, material, and region.

All figures are estimates and will vary with window size, glass package, installation type, and your local market. Always collect multiple local quotes before deciding.

Our sources

• NerdWallet, Cost to Install Replacement Windows
• This Old House, Window Replacement Cost
• Pella, Replacement Window Cost by Material
• Homewyse, Replacement Windows Cost Calculator
• Angi, Exterior Door Installation Cost
• HomeGuide, Patio Door Installation Cost
• Windows Canada, Replacement Windows Cost
• Reno Quotes, Window Replacement Cost Canada
• ENERGY STAR, Windows, Doors & Skylights
• U.S. Dept. of Energy, Update or Replace Windows
• Consumer Reports, Best Replacement Windows