解放以来,上海在新建大量职工住宅的同时,还进行了大規模的住宅維修养护和整頓改善工作。自1958年后,上海开展了原有住宅的加层工作。到1961年,住宅加层的面积共約11.4万平方米,按新建4～5层住宅每公頃1～1.2万平方米計算,节約建設用地143亩～171亩,节約建設投资約216万元。可見,住宅加层工作对于节約土地、利用城 Since the liberation of Shanghai, while building a large number of employees’ houses, Shanghai has also conducted large-scale maintenance and repairs and improvements. Since 1958, Shanghai has carried out the addition of the original residence. By 1961, the total area of ​​residential buildings was approximately 114,000 square meters, which was calculated based on 1 to 12,000 square meters per hectare of new 4- to 5-storey residential buildings, saving 143 acres to 171 acres of construction land and saving about 2.16 million in construction investment. yuan. It can be seen that the addition of residential work will save the land and use the city.