6% to the value of the home property price increases of £15,000 to £75,000 This is Money property price increases of £20,000 to £140,000 adding value to your home property price increases of £15,000 to £75,000 an extra bedroom Which? Magazine this article from This Is Money 6% extra value up to 6% 6% extra value adding value to your home property price increases of £15,000 to £75,000 This is Money property price increases of £15,000 to £75,000 based on the kitchen and bathroom add up to 6% to the value of your home serious value to your home add a good 9-10% to the value of your home