Price increase of a home seller by 50 percent

Hello everyone,

we are currently building a small house/cabin for our business and have decided on a log cabin for this. Planning has been ongoing since April. Since it is a commercial property in a residential area and there are a few exemptions (ridge direction, boundary distance), the approval process took about 7 months.
At the beginning, we obtained a quote from a company that was supposed to deliver and assemble the house. Of course, we calculated based on this offer price. It dates from May. Today we wanted to place the order, but we still had a small change. The roof overhang on the front side was shortened from 1.5m to one meter. We expected a very small reduction in the offer, as we were told at the start of the negotiations that the price would be based on the required cubic meters of wood.
Well, what can I say. The colleagues presented us with an offer that had increased by a whopping 50%. Without even blushing. Reason: the price of wood and transport costs had increased.
We could have ordered earlier. Is it really that simple? To me, this goes far beyond the label "unprofessional," doesn't it?

It depends on what is being negotiated. He could have even told you today: No, I won’t deliver a house to you anymore.

The offer period of the first offer seems to have expired.

Ok, then I should probably be grateful after all that he wants to sell me one. Also good.

No, but there are suppliers and demanders, and in a market economy the interaction between both determines the price.

He still offers you the house, but on terms you are not willing to pay. So "No Deal."

Your question whether it lies above the predicate unseriös cannot be answered.

The question: Is it that simple, can be answered. And that is with YES.

(Almost) no one in DE is obligated to sell you anything at all, and if so, at what price.

Who says that I am not willing to pay? I just wanted to know if I can do something about it.

Would the construction start immediately upon commissioning, or is the company so busy that they would only begin next year anyway? You can ask politely and, if in doubt, insist on having a fixed completion date (not a time span!) included in the contract. Let's see what their reaction is.

If they do not start immediately but only in spring, then use the winter months to look for another house-building company. Construction would then also begin in spring. You would be finished at the same time but save a lot of money.