I'm not in favour of 3 storey houses, even if developers do because they can cram more properties onto a smaller space. . They are very impractical to run and clean. How would you like to lug a heavy vacuum cleaner up 3 flights of stairs every time you have to vacuum? Also, if people want to stay a long time in the same house, they will grow older and climbing stairs are difficult. It's expensive enough having to install a chair lift onto one flight of stairs. Imagine if you had to install two of them ! A downstairs toilet is essential, and a kitchen large enough for a family to eat breakfast in, even if they would prefer a separate dining room for other meals. Most houses have totally inadequate storage for the average family, both in kitchens and byuilt-in wardrobes in bedrooms. A utility room for drying clothes and ironing would also be ideal. New houses near us are being built with telephone/internet connection points in every upstairs room.