Planned start of construction of the house meaning

First of all, you need to have your contract properly reviewed or you should have done this before signing. You can set a deadline in writing, so you also have something documented. Legally, it does not help you further.

We have done everything.

Get out of the contract with a lawyer.

That is our next step

That is our next step

But it will cost you a contractual penalty

But it will cost you a contractual penalty

Why? The contract does not impose penalties on the builders, nor on the BU