How the calculation works
Count only additional costs caused by the renovation. Enter rent, storage and overlapping utilities for each month, then moving-out, return and other one-off expenses. The delay scenario repeats monthly costs without repeating one-off costs. Building work, refundable deposits, tax benefits and finance charges are excluded unless you add a non-overlapping expense yourself.
Total including delay = Monthly extra cost × (Months in the plan + Additional delay (months)) + One-off extra cost