M0nica
growstuff Not being a building surveyor I have no idea how often such surveys should take place nor their cost, but that doesn't stop me being aware that there are many non-detructive ways of examining buildings these days.
But as the R4 programme made clear, when the financial shoe pinches, the first thing that is delayed or cancelled is maintenance work.
I used to be married to a building surveyor, so I have an idea how much surveys cost, especially when scaffolding and asbestos investigations are needed. It obviously depends on the size and circumstances of the build, but we're talking about tens, if not hundreds, of thousands of pounds and very regular surveys. Schools just do not have that kind of money. It's becoming increasingly evident that local authorities and trusts were, in fact, aware of problems, but couldn't then afford the remedial work anyway.
I am aware that lidar and some other techniques are used in surveying. My partner has been involved in surveying a car park for an ancient artefact and I've seen the kind of results produced. (The area involved is tiny compared with a school flat roof, but it was still expensive.) I'm not a surveyor myself, but I doubt if the results would show when materials are stressed. A building surveyor is still needed and, in any case, if there is some kind of stress or fault, a structural engineer will still be needed to plan mitigating work with minimal disruption.
The point is that these buildings were never intended to last long-term and patched up like a listed building. It was known that they would need to be replaced, but it would appear there was little planning for contingency funding. It's emerging that the current government has diverted money for rebuilding to free school ideological pet projects. There have also been more cases of collapse over the last few years than was made publicly known. There's a lot of passing the buck going on.