@Ruralbliss sorry for slow reply.
Homebuyers survey on 1930s rural cottage. So quite old, but of relatively modern construction- cavity walls, concrete subfloor.
Part of the point of getting a survey is that sellers always ask to see it if you ask for a reduction because works are needed: I may be perfectly able to see for myself that this chimney is not adequately supported (in another house I bought for renovation), but the sellers are not going to take my word for it, they can only be persuaded by a surveyor.
The other part is finding something you just have no experience of, and just haven't noticed.
With a recent build, some feel a survey isn't so important. I lived recently in a small town, with two newish estates. One had subsidence, one didn't. Not all newish estates are built to the same standard.
And also, it's like insurance. At one point in my life, I picked up 3 small DC, and left a dysfunctional marriage in search of a better life for us. ( Do it!).
I was so skint for a while. I paid insurance for a washing machine: cause I couldn't live live a week without one, and couldn't afford to replace it. I don't think that insurance is cost effective, so now that i can afford to swiftly replace a dead washing machine, |I don't bother with it.
Similarly , if you can afford to reroof your house, or re-do the drains, you maybe can afford to save the costs of a survey. If that would be a disaster for you, don't skimp on a survey.
My DF thought he knew as much as most surveyors, but failed to spot a failing bay window lintel on a Georgian house: complete 2 storey back wall demolished, while house supported on accros, and rebuilt.