You can submit an application via the L-Bank funding portal (Z15 Online Application | L-Bank).
The responsible office (Housing Promotion Agency) will check your application in the portal for completeness and eligibility for funding. Complete and eligible applications will be forwarded to L-Bank for further processing. You can also obtain further information and advice on your specific project from the relevant office.
L-Bank will help you on 0800/150-3030 (free of charge from the German landline network or with a German mobile phone network and provider; Mon. - Fri. 8.00 am to 4.30 pm), especially with financing questions.
Please note: A premature start to the project will result in the funding being rejected. You can start the project at your own risk once you have received confirmation of receipt of the complete, verifiable and signed application from the responsible office (housing subsidy office).