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You can use this calculator tool to figure out your likely breakeven number in years. Read more about the ADU breakeven calculator here.
To use the tool, simply enter your values for the cells highlighted in green and blue by double clicking on the cell. The bottom cell in yellow will show you your ‘Number of Years to Breakeven’.
For a full version of the tool where you can view (and modify) the core calculator assumptions, or, if you’re having problems with the version displayed below, you can download this MS Excel spreadsheet.