通常有两个原因：
There are usually two reasons:
一是 原有房子的水电线路比较老，不能满足现在的电器正常运行，从安全角度考虑要进行水电改造。比如很多老房子用的是铝芯线或者电线过细，水管是镀锌管，水质不达标，存在安全隐患，肯定是要换掉的。
First, the water and electricity lines of the original house are relatively old, which can not meet the normal operation of the current electrical appliances, so it is necessary to carry out water and electricity transformation from the perspective of safety. For example, many old houses use aluminum core wires or wires that are too thin, and the water pipes are galvanized pipes. The water quality is not up to standard, and there are potential safety hazards, so they must be replaced.
二是 个人对新家的个性化使用需求，从生活使用便利角度需要进行水电改造，比如装上射灯、双控、软水设备。或者需要根据配置的家电、家具设备等重新安排水电位置，老的线路位置不能满足新的需求。
Second, the individual needs for personalized use of the new home. From the perspective of the convenience of living, it needs to carry out water and electricity transformation, such as installing spotlights, dual control and soft water equipment. Or it needs to rearrange the location of water and electricity according to the configured household appliances, furniture and equipment. The old line location can not meet the new demand.