Construction delay - What rights do you have?

The OP will still have a lot of fun building... with that attitude. He wants help and snaps at anyone who doesn't say what he wants to hear.

Just deduct the 1000,- euros and see what happens.

P.S. why don't you buy the scaffold used and sell it again in the end? How do you want to apply the plaster without scaffolding? Sheet metal work? Roof? Painting?

Where do you get this information from that I wrote the whole thing takes place without scaffolding.

Really funny what people make up here out of thin air.

The scaffold was planned for 10 weeks.

Set up, then lay the ceiling, 2 weeks for the upper floor, then the roof truss, roof tiles, and finally the plaster.

Buying a scaffold was also our first idea, but for the size of our house we would have easily paid 15,000€, I don't have that just lying around...
And besides, the scaffold has to be set up by a certified specialist company that signs off that everything is correct. If the plasterer falls down, we bear no responsibility...

If you order a taxi to go to the airport and the taxi is late and you miss the flight, who is to blame then? Yourself or the taxi driver because he was late...?

Now one could say plan more time so that if the taxi is late there is still a buffer, but what if it comes so late that your buffer is gone...

If you order a taxi to go to the airport and the taxi is late and you miss the flight, who is to blame? Yourself or the taxi driver because he came late...?

Great example that fits well. Namely..... can you hold the taxi driver liable because you missed your flight? No... Will he give you a discount? No... He will make excuses about traffic etc. Just like your company does with delivery delays...

You have to order your taxi in such a way that you will definitely make your flight on time... And if you realize it is going to be late, you just have to quickly contact another one and hope you still make it to the flight on time. Specifically for you, if you know the parts are not there, contact the other trades and ask if the scaffold is needed now... Period, end of story...

The scaffolding was planned for 10 weeks.

So you are still within the rental period.

We also have no other incidental costs, such as construction power, toilet, etc., and the 21 days can easily be made up with more working hours and helpers.

You say you can make up the lost time? So where the heck are these 1000€ costs coming from now if you are still within your rental period?

Do you think you could trick the developer out of a 1000€ without having suffered any (financial) damage so far?

You know what? Just work faster once the ceiling is on, then everyone will be happy again.

If you order a taxi to go to the airport and the taxi arrives late and you miss the flight, who is then to blame? Yourself or the taxi driver because he was late...?

This is also a clear case, you.

The scaffolding was planned for 10 weeks.

Aha... what time buffer have you planned here? My construction was already quite fast but 10 weeks gross stand time? Who calculated that for you? It is common that the scaffolding is removed between roof and exterior plaster, because interior and exterior plaster are done sequentially. Since the stand time is more expensive than the reassembly, this is the usual solution. Our scaffolding stood for 6 months from mid-November to mid-May. The shell with roof was finished 3 days before Christmas and the exterior plaster around mid-May. During this time, the trades worked continuously in their respective order except for 2 weeks after Christmas. No one was in a hurry because the photovoltaic system was still to be installed on it and the scaffolding, let's put it this way, was very cheap. How is your construction schedule with the respective trades phased?

Great, and respect that you do so much yourselves.

From the information available, I understand:
1. A prerequisite for the start of the staircase and ceiling work was generally the scaffold to be provided by the builder.
2. At the agreed date, supports that were necessary for the work to be carried out were missing.
3. At the alternative date, these supports were still not there.
4. The supports were supposed to be set up by the builder (assumption) and could not be procured in time (delivery difficulties).

If that is the case, there is no basis for you to make claims against the company with the contract for staircase and ceiling construction. The postponement is not their responsibility. They also have to figure out how to fit the delay into their scheduling and will advocate for you so that it goes quickly once the supports are there. They themselves do not have to hurry – there is a lot of leverage here that I wouldn’t test.
If that is the case, then you are obliged to pay for the scaffold as long as it remains there. However, the scaffold builder can remove the scaffold after the agreed period if he needs it for another job.
So if that is the case, you are stuck with the costs, and your suppliers can help you by minimizing the impact of the delay by acting quickly and replanning.

That may not please you – you asked about chances of recourse and your own bad luck.
Answer: chance of recourse – hopeless
Own bad luck: yes, that is bad luck and also personal responsibility (not guilt, since that is often equated with responsibility).

In the thread, I get the impression that everyone who writes something you don’t want to hear gets attacked. Let’s see what comes next.