Structural Engineer mentions Subsidence but what do you think?

We just had a structural engineer's report back on a property we are hoping to buy and it mentions possible subsidence. He seems to be indicating there is movement on the rear elevation and this could be caused by a leaking pipes making the ground underneath weaker. Is this something that is feasible and if we were to conduct a CCTV survey of the drains would we likely see anything?

The report says the following:

In contrast the rear projection exhibits evidence of typically moderate historic structural
movement although the trend appears inconsistent. There is clear evidence of a drop
along the side wall towards the rear corner and at least some settlement also along the
back gable towards the party wall. Internally there is at least moderate settlement of the
kitchen floor and some further evidence of movement in the area of the rear landing,
bathroom and back bedroom.

b) There is evidence of at least moderate historical structural movement having affected
the rear projection, although no signs of any significant more recent or ongoing
instability. The exact cause of the movement is unclear, although there is the
possibility of underground drainage defects, dictating the advisability of arranging a
CCTV survey and undertaking remedial works if or as found necessary.

 

Oh interesting. I read that the movement is caused by a possible leak in the drainage being the culprit. It didn't occur to me to think of it that way around!

 

Thanks for your input. Yeah I think we need to talk to the survryor/engineer asap but unfortunately he is seeming very unresponsive. Very good question to ask how recent historical is and whether he thinks it is an issue that has now settled.

 

Thanks for this. I am talking to him later today so should have a better idea of why he thinks these things very soon. Your input has been very useful, thanks.