"used" houses too? 50,000DM (paid in installments), built around 1750, purchase date 1999. Plot 298m² (bordered on three sides). Estimated usable area certainly over 200m². Living area? Something around 130-140m². And probably bought too expensive in hindsight ;). Since then, an estimated 50-70K€ has been put in "bit by bit" (I never kept track). Still forgotten my own work: estimated 30-40K equivalent (or even more in the last 20 years)