Installation appointment rescheduled because the window color is incorrect

- yes, I have everything in writing and also think that it is relevant.

- of course it's bad luck - something like that can always happen but yes, I will or I have followed the advice of and have written an e-mail to our prefabricated house manufacturer asking for a precise clarification of the circumstances and requesting a solution

It does make a difference, however, with which justification the windows were not or incorrectly delivered.

In any case, it is a fault of the manufacturer or their supplier, unlucky but legally not a case of force majeure, and does not relieve the contractor of their contractual delivery obligations.

I don’t know to what extent the degree of completion in the workshop is, maybe it would be a compromise to install the windows later and deliver them now. In his case, the walls are also just in the way. They have to be cleared out and put back later.

From a production logistics standpoint, installing the windows on site would be an extreme complication. I assume that after a missing approval from the incoming goods inspection, the production slot for the walls was already canceled. Your idea might apply to a backward manufacturer, but current market participants are probably already so fully digitized that they don’t have semi-finished products just standing around.

I believe that due to the tight deadlines, the incoming goods inspection did not notice and the walls are already in production.
This has nothing to do with being backward. The goods inspection must realize that it is not only about the colors being present, but to look closely that they are wrong. This does not run digitally.

I think that with the tight deadlines, it wasn’t noticed by the incoming goods inspection and the walls are already in production.

I, on the other hand, do not believe that the anesthesiologist stands at the table before the patient has signed the consent form.

The goods inspection must notice that not only the colors are present, but look carefully that they are the wrong ones. This is not done digitally.

The visual inspection is done by a person who gives their OK (or not). Only with the OK is the goods "authorized" to go onto the forklift. Production control checks whether all supply elements are in stock: if not, the production slot is canceled. The incoming goods inspector is thus quasi responsible for the installation of possibly incorrect elements—unless this manufacturer has a quality inspector for the finished walls. In that case, the walls would now be finished but incorrect and would have to be dismantled (but the customer would probably be called first to ask if they would accept the stuff as is in exchange for five green bills, a bouquet of flowers, and a large box of chocolates, so that one could then meet the agreed date). The shipping supervisor usually only checks the order picking. I don’t know of any "old" prefabricated house manufacturer that would have survived the industry’s transformation without digitization (except as a brand swallowed up by some private equity firm).

Digitalization is useless if a wrong approval is given manually. Wood and gray are there. Check boxes.
It doesn’t matter where it happened.
Whether the inspector noticed it or the person installing the windows, that somehow it doesn’t fit.
The windows are wrong.

when we signed the contract last year in summer 2019, the plan was that we would be in by December 2020 at the latest. Now we moved in in May and now it will probably be August:

Yes, honestly: were you realistic when thinking about December? I believe every builder imagines themselves in the house earlier than possible and ignores the time for the building application, weather, screed drying, etc. I also used connections and instead of 3 months for the building application, it only took 12 weeks... And then the company didn't even start immediately. And on December 22nd every craftsman, including the tiler, stopped working. We had already sold our house 13 months earlier, spent 5 months homeless or with my parents, then in a holiday apartment... It couldn’t have been different for us, but it was as it was. If we had decided on the plot three months earlier, everything would have gone differently. It’s just bad luck, and rough patches are part of building a house as much as they are part of life. Just stay calm and enjoy the next few weeks - the calm before the storm. And the rent for the construction power box isn’t that high, as if it were already running.