Hello,
We're in the same boat, need a side return done, but cannot afford to rent short-term and move out temporarily. My husband says he'll stay 'on site' at all times, as he loves all of that, and likes picking up on any mistakes the builders make. I half thought of taking a couple of weeks off work and taking our daughter to stay with my parents during the real nitty gritty dusty part!
Would certainly recommend you get one company to do the lot, and can highly recommend LJS Property who've just completed our top floor renovations and provide everything right down to carpet fitters etc at very reasonable and competitive prices, we lived through that dust... so I am beginning to get used to it now!
http://www.ljsproperty.com
Hope this helps and good luck!