Real Estate / How much would it cost to build a house in Poland? [23]

Hi!
I am Polish and I speak it fluently, however I moved to the UK at the age of 3 but I plan to move back soon. I would love to build my own house, preferably near-ish to Pruszków (Komorów, Michałowice, etc)

I would like to have a house that has 2 floors (Base, 1st floor, 2nd floor) with each floor being 500sqm as I plan to buy a plot of land that is 1500sqm to make sure that it is a house with a garden that has ample space for any future children/changes.

Many Thanks!
Maja