That is the main reason it needs a lot of up doing up,you find this a lot with bungalows because people who buy them do not want to do much work as they are getting older,go and have a look at it,take somebody who knows something about building they may spot a big problem,if I was looking at it I would check the roof just look at it front and back before you even go in,beware of trees near it,new electrics,central heating,double glazing ,kitchen and bathroom,factor in £15,000 and do not forget to get a lump of the asking price.