There are so many ways to alter a property. The same short description ‘three bed terrace’ or ‘four bed semi’ might gloss over a kitchen extension, an en-suite carved out of a master bedroom or a knock-through kitchen diner. All of which makes analysing average prices on a truly like-for-like basis, increasingly difficult. A one bedroom penthouse apartment and a small one bedroom flat are both defined as ‘flat’ in Land Registry data.