I've gone to two chartered surveyors who will simply provide a letter of certification that my internal wall is non load-bearing. My local council needs certification. When asked, one quoted "about £100" the other "£110". Must be about the going rate. Now as I understand it, a survey would have to involve the surveyor turnng up at my house and doing the inspection. I don't think it is possible that I provide information, by way of a description and pictures, in order to obtain a letter of certification. I think the surveyor must do a visual inspection. Of course I don't need any beam calculations, (I'm just knocking a non load-bearing wall down). But later on I have need to knock a load-bearing wall down and I was wondering about doing it with the help of friends. I have seen some services offering to provide beam calculations. I think, could you could use those beam calculations in any plan you send to building control? Well, in that case, no-one has come into your home before doing the beam calculation, yet maybe it's going to be accepted by building control. Then again, maybe not. Probably not? I think the situation would be, that most people would be required to get a builder (where a wall is load-bearing) and he would provide the data and the credentials to satisfy building control. I'm not sure who the target customer is for those places who provide I beam calculation services. It does not look as if they are any good when a householder needs to satisfy building control. If they were, I might have been able to get such a firm to provide certification for less than £100.