The greenUP team has a good overview of Subsidies, funding guidelines and funding conditions, as well as eligible funders such as federal and state ministries, the EU and foundations.
In principle, plenty of building costs can be saved through good planning. Good planning can save far more than cheap building materials, and sustainable concepts are sometimes far more cost-effective than conventional solutions. Furthermore, the type of financing plays a major role and the use of possibly available subsidies, although most sustainable concepts are economical without subsidies.
