We are in the process of getting quotes in for a mid terrace single storey extension. I want to ask builders to get their own portaloo so they dont trash our hallway/loo for however long it may be. I'm pregnant and constantly needing to go, (sorry TMI) DD is just starting to toilet train too so dont want to add to the stress with more "accidents" if its not necessary. OH thinks i'm bonkers for even thinking about it but he's not the one who's going to be around sharing 
What's the "done" thing? what did you do?