The house might well be covered by Bellway's company third party liability insurance but your contents may not.
Be careful.
The £1,500 "offer" for 14 days works out at £107 per day, presumably for two people!
It's not enough! £90 per person, per day is £2,520 for 14 days.
You should also get it in writing that if you are not able to return on day 15, after you are told be move out, then you should be paid a penalty of £200 per day in addition to further accommodation/subsistence payments as agreed.