When suitable inner-city residential sites are impossible to find, the only solution is to go upwards!....Built on the roof of a 1920's former textile factory, this is a contemporary, single-storey penthouse apartment perched over the bustling streets of Norwich, three floors below. Constructed of a lightweight timber frame with a self-coloured render skin, the apartment provides 2 bedrooms, a large open plan living/lkitchen/dining room with roof terraces to three sides and with a large expanse of bi-folding doors, it enjoys panoramic views across the city. Insulated far in excess of current building regulation standards and incorporating an air-source heat pump and PV solar panels, the 900 sq ft dwelling is virtually self sufficient with regards to energy use and consumption. Whilst our European neighbours have a long history of living and working in city centers, the concept has largely escaped us here in the UK where we seem to prefer residing in remote suburbs and daily commuting to work. Hopefully this unique and innovative dwelling can encourage more people to take up residence in urban centers and thus help to reduce congestion, lower pollution, and encourage more pride and sense of 'place' within the local community. All successful buildings require a close relationship between the client and architect but in this case the owner in particular should be praised for their visionary thinking and belief in creating a modern, sustainable home from such a blank canvas.