Hello Lilli86, 180,000 € for a bungalow with approx. 100 sqm without additional construction costs, notary fees, etc. can be sufficient. It strongly depends on the equipment built or materials used and which contractor or architect receives an order from you. We also planned a bungalow and received various offers, 1250 to 2400 €/sqm. Very important: list all costs house, additional construction costs, outdoor facilities, carport-garage, kitchen ... Pay attention to which services the BU performs during the expansion, if anything else needs to be done, e.g., painting work, flooring, satellite dish ... If everything is planned perfectly and fits, you leave 8000 to 10000 € as a buffer, it will be costs that you did not expect at all.