ᐅ Flooring first or interior door installation first?

Hello,
I have purchased a mid-terrace house from a developer. Since I want sound-insulating doors, I cannot use the door company recommended by the developer. They only install the standard doors planned for the project.

Now I am considering not having any doors installed during construction and having a specialist company fit them only after handover. At the same time, parquet flooring still needs to be installed throughout. How should I best organize these tasks?

Does anyone have experience with acoustic interior doors? I would like to have them on the bedroom doors and on the ground floor in the "living room." The "living room" will also serve as a consultation room for a psychological practice. The house will be shared by a group of people in their mid-40s. I don’t want to know what my housemate is doing in their bedroom.

Do you have a mechanical ventilation system with heat recovery? If so, the altered airflow must be considered (no air transfer under the door, but separate supply and exhaust air).

Are the walls highly soundproof? With aerated concrete blocks or thin drywall, the door won’t make much difference. You need to approach this as a complete concept, not just by adjusting individual elements...

You recently asked this question.

Usually, the flooring is installed first, followed by the door frames.

Thanks, Rick.
I’ve already asked about the doors. Now my main concern is the best order of work and whether to install the floor before the doors or the other way around. Because if I had taken the doors from the builder, then it would have been doors first, and then the floor to be installed by myself.

Yes, the house has a mechanical ventilation system with heat recovery (D). My question is what is more cost-effective: getting the doors through the builder or sourcing them externally later. Even if they were just standard doors and not acoustic ones.

Then you would need to change the mechanical ventilation with heat recovery system!
Doors with higher sound insulation are not available with transfer grilles.
From sound insulation class SK2 it becomes quiet.
You will receive a small credit from the developer if you remove the doors and frames from them.
Good doors also cost good money...
But this way you would only pay once.
What is the wall construction like at the affected areas?

The interior walls are partly constructed from red lightweight concrete blocks and partly from aerated concrete (Ytong). The thickness is, I believe, 12cm (5 inches) plus plaster.

Maybe I'll just leave the doors as planned, and it will somehow be fine. Each door costs around 220 euros including installation (painted then 370 euros) plus VAT.

To be honest, if I were you, I would do the same.
See how it works out then. You can always install a "more stable" door leaf later without much effort...