Real Estate / Planning building permission in Poland (I have some land in the countryside) [3]

Hi,

I have some land in the countryside and wish to build a house. There is presently an unused and old (about 30 - 40 years) brick barn on the site and an even older (unused) wooden house. At the location of the barn I would like to build a new larger house. What is the procedure for obtaining planning permission? Do I need to design and plan the property, or can I obtain basic planning permission first?