If you are replacing ceiling and floor take the opportunity to replace all the electrics you can reach. Add more sockets and switches where you want them avoid the risk of having to change things later. In theory that should be done by a qualified electrician.
yeah, these things always get out of hand :p my dad was an electrician so I always have him check before I finish the walls but these installations are pretty straightforward.
If you are replacing ceiling and floor take the opportunity to replace all the electrics you can reach. Add more sockets and switches where you want them avoid the risk of having to change things later. In theory that should be done by a qualified electrician.