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I haven't done anything so extensive but my experience from similar stuff is that:
a) It's a bit grim living somewhere that is part building site. There's dust everywhere, various stuff isn't working, if you're home during the day it can be noisy, etc
b) Things can move quicker if there's less concern about someone living there. A room can be used as a bit of a workshop, the property doesn't need to be made habitable each day (e.g. you can leave the water turned off for a few days), etc
I'm not sure if you need to go as far as putting stuff into storage but not living there may make it a bit more pleasant. Although whether the cost of an Airbnb is worth it is probably something you need to consider yourself.
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We lived in during an extensive downstairs remodel. Put basically everything downstairs in storage, builders did their best with the dust, but it was grim. Microwave meals eaten in bed for what felt like forever. Not really much fun and next time I'd go somewhere else (local) for the duration. I did a lot of wfh though (office oasis, good headphones on) and did enjoy being on site for the fussier details as I was sort of making it up as I went along. Builder appreciated the contact.
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Is there going to be replastering and some decorating involved afterwards?
We had some lesser work done including whole new bathroom, plastering of some walls and ceilings, flooring laid, etc. The whole took like 9-10 weeks iirc (maybe 12 can't remember for sure).
We were still living in but my partner found it really stressful. I was okay and loved seeing the little baby steps each day working up towards the finished product. It was worth it. If you have got the option to move out it'll be better for your family AND the builders. It might even enable them to work faster. Although I do think that 3-4 is unrealistic. Are you drawing a contract with them?
Potentially having a lot of internal work done around the whole house, including removal of walls and inserting of RSJs, completely new kitchen, new radiators around the house, new skirting-board in every room etc. Estimate was 3-4 weeks, which I think is fairly optimistic, but what do I know.
Builder asked if we'd be living there during the works, and seemed to suggest we'd be ok for most of it, but I'm wondering if it is better for everyone (me, wife, 3 year old) if we put as much stuff as we can into storage and go on holiday with relatives for some of it and stay in a local airbnb for the rest and just let them get on with it and not try and live through it.
If someone has done this and has any useful learnings, please do share.