If you bought in the last 20 years.
Houses are now worth the same as they were worth 20 years ago in real terms. We need to get over the idea that every homeowner is sat on a money making asset and therefore is in a preferential position to pay loads of tax on all this non existent unearned wealth. Too many people don't understand how inflation works. £1 in 2006 is worth £1.65 today. House prices need to go up 65% just to be worth the same in real terms.