is that a sledge hammer to the walls!I'll do it in a day. It won't be pretty and nothing will work afterwards but I'll get it done for you.
for example a 2 bed terraced shell unoccupied average points £550
3 bed £650
the closeness of your quote and the £2190 shows that is a sensible price. £1375 is a cowboy chuck it in quick bodge price.A while ago we priced some 3 bed new builds at £2250 each, two other firms priced them, one at £2190 each and the other at £1375!
The £1375 quote won it. I got a peek at a first fix and it wasn't pretty!