To calculate the post-renovation value (PRV) of a property, you will need to first determine the estimated value of the property before any work is completed. This can be done by researching comparable properties in the area that have recently sold. Once you have an estimate for the pre-renovation value, you will need to add the estimated cost of the renovations. This total represents the maximum amount that you should spend on the property in order to ensure a positive return on investment. Finally, you will need to subtract any outstanding mortgage or loan balance from the estimated PRV. This will give you your estimated profit from the sale of the property following completion of the renovations. This how much is my house worth after renovations calculator is accurate, but if you're looking for a faster method, you can also use a home improvement value calculator like this one.