We decided on a single storey extension for our semi.
Lovely neighbours came to us after planning permission and party wall agreement granted and said they were inspired to do an extension themselves..
This would mean a shared wall which one of our builders would make and the other party would pay half. This is all pretty standard. We informed our builder and adjusted our plans accordingly.
So far so normal.
Two weeks before our builder was about to start breaking ground our neighbour said that they would be breaking ground a week before us and that their builder would take care of the shared wall. This was before the party wall surveyor had been to assess the impact of their extension. I said that this really shouldn’t happen. I asked them to reconsider and ‘go by the book’.
They ignored and the builder broke ground anyway, their surveyor came the next day told them they really shouldn’t have done it but no one seemed to care much.
Here's the crux of my AIBU...This happened without any agreement/contract with us over how much we should pay next door's builder for our share of the wall.
We spoke to our builder and he agreed to recost our project and took £2000 off the price of our extension, which we could use to pay next door’s builder for the shared wall.
However, next door’s builder has sent us a bill for £4000 for half a wall (so in his opinion the whole thing cost £8000 - for a wall!)
I disputed and sent the bill to their party wall surveyor to get his professional view. He sent me some rough calculations and advised me that a fair price for half the cost of the wall would be £1900.
We informed next door’s builder of this but he is still insisting on us essentially paying an extra £2000 for the privilege of next door having an extension too.
So would IBU to pay him £2000 and no more? We have no contract with him, he broke ground before a party wall agreement was in place, he never consulted us, and he seems to be a rip off merchant.