It is essentially calculated as the interest rate times the outstanding principal amount of the debt. Interest expense on the income statement represents interest accrued during the period covered by the financial statements, and not the amount of interest paid over that period.
Even though my basement bathroom cost was around $3,700, you could probably do it for just under $2,000 if you really pushed the envelope, maybe even less. I'm not going to sugarcoat the project. From a time perspective it takes awhile if you're doing it by yourself.
Cost of Basement Bathroom Rough-In. We're interested in adding a half bath to our basement. The room would be about 10-12 feet from the waste stack (cast iron), which runs down from the upper floors into the basement (concrete) floor and out to the street.