There are limits to what a homeowner can do without having their work signed off. For example adding a whole new circuit to their fuse box wouldn't be allowed.

There are limits to what a homeowner can do without having their work signed off. For example adding a whole new circuit to their fuse box wouldn't be allowed. However, it is possible to have your work signed off by the building regulations authority. Even a full rewire could be done this way, obviously it needs to be compliant to be signed off though.