I've been doing this for a long time now (more than 35 years) so have probably encountered most of the challenges that you are facing. I understand that for some of you it can seem quite daunting with all the official language and paperwork so that is why I am here to help.
There is no such thing as a silly question. It is much better to ask than to get further down the line only to discover that there is something wrong because an assumption was made, so please ask. It makes the whole process go much more smoothly.
Because I have worked in this environment for a long time, I can guide you through your project and can even help fill in the building regulations documents where needed. I can even remind you about getting your completion certificates so that if you ever want to move in the future, you will have all the paperwork you need.