Room Addition Cost Calculator

Total Cost: $0


Adding a new room to your home can be an exciting project, but it’s essential to understand the potential cost involved. Our Room Addition Cost Calculator can help you estimate the expenses associated with your room addition project. Whether you’re planning to expand your living space, create a new bedroom, or build a home office, this calculator will give you a quick estimate of the total cost.


To calculate the cost of your room addition, our calculator uses the following formula:

Total Cost = (Length x Width x Height) x Material Cost per Square Foot

How to Use

  1. Enter the Length of the new room in feet.
  2. Enter the Width of the new room in feet.
  3. Enter the Height of the new room in feet.
  4. Enter the Material Cost per square foot in dollars.
  5. Click the “Calculate” button to get the estimated Total Cost.


Let’s say you’re adding a new room to your home with a length of 20 feet, a width of 15 feet, a height of 10 feet, and the material cost is $20 per square foot.

  • Length = 20 feet
  • Width = 15 feet
  • Height = 10 feet
  • Material Cost = $20 per sq ft

Clicking the “Calculate” button will give you the estimated Total Cost:

Total Cost = (20 x 15 x 10) x 20 = $30,000


  1. How accurate is the Room Addition Cost Calculator? The calculator provides a rough estimate of the cost. Actual costs may vary based on various factors.
  2. What factors can affect the total cost of a room addition? Factors like location, labor costs, permits, and the type of materials used can impact the final cost.
  3. Is this calculator suitable for commercial construction projects? This calculator is primarily designed for residential room additions.
  4. Can I use this calculator for estimating the cost of a garage addition? Yes, you can use it for garage additions as well.
  5. Do I need to consider taxes and fees in the calculation? This calculator only provides an estimate of material costs. Taxes and fees may apply separately.
  6. Is the calculator applicable for different currencies? The calculator uses dollars as the currency by default. You can convert your local currency to dollars for accurate calculations.
  7. What if my room has an irregular shape? You may need to consult with a contractor for precise calculations in such cases.
  8. Can I use this calculator for multiple rooms in a single project? You’ll need to calculate each room’s cost separately and then sum them up for the total project cost.
  9. Are labor costs included in the estimate? No, this calculator only considers material costs.
  10. How can I reduce the total cost of my room addition project? Consider cost-saving measures such as using cost-effective materials or doing some of the work yourself.


Our Room Addition Cost Calculator provides a quick estimate of the material cost for your room addition project. While it’s a useful tool for initial planning, remember that actual costs may vary depending on several factors. Always consult with professionals and obtain detailed quotes before starting your room addition project.

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