As I told you when you contacted me, you have, in my honest opinion, had a very lucky escape with Avant!
They were the only large house builder I know of that reported a LOSS in their financial accounts last year.
In addition, they are the ONLY house builder to be rated TWO STARS by their own customers in the HBF survey in 2015 (results published 2016). They have lots a star every year since 2013 and clearly seem to have problems.
Whatever the deal, price etc. I would strongly advise you NOT to buy a new home from any Avant company.
As you say, it is not even good value either!
My advice would be not to buy any new home, but if you want to, buy one from a five star rated house builder such as Miller or Barratt whose site managers also win NHBC Quality Awards.
Even then, be careful and protect yourself!