As populations expand around the world, the pressure to build upwards is growing. In cities such as New York, adding floors to a building is commonplace, while in Hong Kong thousands of rooftop extensions are added illegally. In Britain, the practice is less usual but it may become more so in future, as a less disruptive alternative to basement excavations. John Parsons, associate director of built environment at the Royal Institution of Chartered Surveyors, says: “If you want to extend in a sensitive area, then this is the way to do it.”
随着世界人口的不断膨胀，盖高层建筑的压力也与日俱增。在纽约这样的城市，在原有的建筑上加盖楼层司空见惯，而在香港，成千上万的屋顶加盖了违章房屋。而在英国，这种做法并不常见，但将来它作为破坏较大的开挖地下室的替代方案，也会越来越普遍。英国皇家特许测量师学会(Royal Institution of Chartered Surveyors) 负责建筑环境的副主任约翰•帕森斯(John Parsons)说：“如果想在敏感地段拓展居住空间，那么这就是应对之策。”