Is an offer binding or are deviations allowed?

especially since you also have a retention of security with the [GU]

You neither necessarily have a retention of security with the [GU], nor do you necessarily not have one with individual awarding...

Neither do you necessarily have a security retention with the general contractor, nor do you necessarily not have one with individual awarding...

if the general contractor offers the payment plan according to the Broker and Developer Ordinance, then yes.

You are more likely to have the security retention with the general contractor than with individual awarding.

With individual contracting, you can go significantly more "at risk" with advance payments. With the general contractor, the payment schedule is usually set up so that you pay a lot in advance. However, with individual contracting, you could continue construction much more easily if you withhold payment of a single invoice due to defects. With the general contractor, nothing happens very quickly at all...

So, of course we are continuing to build and we do not have the problem of "who is to blame" as it is a single completed trade .... regarding everything that is wrong with the roof there is a separate thread here in this thread it should be about the positions on the invoice being incorrect .... so we have 2 points

1 Positions on the invoice are wrong / too high / not commissioned .... compared to the offer.

2 there are defects

The expert says the roofing must be removed and the nail sealing tape applied, this must be used with our roof pitch according to the regulations

More problematic is the missing / incorrect vapor barrier, for which everything might have to be removed. Details about this: another thread.

After legal consultation, we objected to the payment order and regarding the question: no, the roof has not even been accepted, so the invoice is not due at all and sending a payment order for a disputed invoice is highly unprofessional .... and we have not gone into advance payment so no problem from that side either

A deadline for rectification has been set.

I'm curious about that.