In order to be able to use an area as a building site, it must first be "developed". This includes the connection to water and energy supply networks, communication lines and the construction of roads and/or paths. The costs for this are largely borne by the residents.

If you want to build yourself, you should include a sufficiently high amount (not less than 5% of the construction costs) for these services in your financial planning.

If you are building with a developer or purchasing a newly built house, clarify whether and which development costs are already covered by the purchase price and which are not.