Cost of attic conversion in the construction of a new semi-detached house

Hello everyone,

we are still in the offer phase for a semi-detached house and want to build with an attic extension instead of a basement.
I was offered 24,000 euros for 26 sqm of living space including insulation, drywall on the slope, concrete stairs with wooden steps, screed, underfloor heating, electrical work and plaster. Windows plus 1,000 euros.
I think that is a steep price, especially since friends paid 18,900 euros for the same house type and the same company 1.5 years ago.
What do you think? Overpriced or justified?

I find the price normal. The price increase is obviously unpleasant, but whether your project and that of the friends are really comparable?

Thank you for your reply. By the way, it is even 26,500 euros compared to 18,900 euros. So an increase of 40%. In my opinion, the cheaper offer corresponds to our offer: Same company, same house type, same house size. Even the same neighborhood. We are talking to this company because our friends were satisfied. They built exactly what we have in mind. What, besides profit optimization, could be the reason for such a drastic increase? (Don't feel like paying up..)

Tariff increases, additional costs for building materials, higher energy requirements (?)

Supply and demand!

Ok, then we probably have to bite the bullet..

I just don't want to feel like I'm being taken for a ride.

What did you guys pay?