A campaign against bathroom windows by young tycoon Victor Li Tzar-kuoi has finally been successful. In one of the more offbeat sections of the Budget, it was announced that bathrooms in flats would no longer need to have windows under changed buildings regulations. 'It may sound odd for a Financial Secretary to mention bathroom windows in a Budget speech, but that small change will save many million of dollars,' said Mr Tsang. What was more odd was that the requirement for bathrooms to have windows had been a big factor driving domestic architecture for decades, architects said last night. The complex, multi-walled design now used in all apartment blocks is dictated in part by the requirement that both bathrooms and toilets need windows. But Mike Rowse, director of the Business and Services Promotion Unit, in charge of cutting unnecessary government red tape, said tycoons had told him this design made construction more costly and labour-intensive, and restricted designs. 'Victor Li told me he didn't care if we never did anything else, we would have saved our running costs for ever,' said Mr Rowse. It is understood Mr Li's father, Li Ka-shing, chairman of Cheung Kong (Holdings), had also tried to get permission for windowless bathrooms, without success. A senior architect in the Housing Department said a study had been launched to see whether window-free bathrooms were hygienic and acceptable to residents. The window-less bathrooms must have a ventilation system capable of changing the air five times an hour, venting to outside the building or to a larger room which has windows. Gas heaters must also be connected to an outside air supply. Interior designer Calvin Chan Koi-tung said: 'Bacteria is less likely to grow in a wet environment in the bathroom if there is natural air.'