Webhow to use the home addition calculator: This home addition calculator helps you estimate the cost of adding extra space to your home. Webjan 8, 2024 · a home addition costs $125 to $250 per square foot total on average, depending on the type and features. Webthis calculator helps you estimate the cost of adding a new room or extension to your home. Input the length, width, and height of the addition, as well as the costs. Webwhat's the average cost for a room addition? The average room addition cost runs from about $120 to $400 per square foot.
