Important: This calculator provides an estimate only and is designed to give you an indication of how staircasing could affect your monthly housing costs. It is not a mortgage illustration, affordability assessment or guarantee of the amount you can borrow. The cost of an additional share is generally based on the current RICS valuation, while the rent after staircasing is normally reduced proportionately from the rent payable before staircasing; however, the exact calculation is governed by your lease and housing provider. Mortgage rates, valuations, service charges and other costs may vary. Speak to a mortgage adviser and your housing provider before making any financial decisions.