Dealing with termination of a rental apartment

Hello everyone,
the developer currently states spring 2018 as the completion date and does not specify it further. In addition, we can only start the owner-performed work (flooring, kitchen, etc.) then. So our moving date is far from fixed, but we have a six-month notice period for the current rental apartment.
How would you proceed here to ensure a smooth transition? Is it common to give notice as a precaution and have one or two extension months confirmed in writing? Due to the current market situation, I do not expect any problems with re-renting, so the landlord actually should not have to worry about vacancy...

Thanks and regards

I would first want to talk to the landlord and clarify how strict he sees it.

There are all kinds. Our landlord was very nice and considerate and simply asked us to keep him updated.

When we then knew the moving date, we could simply hand over the keys afterwards and the matter was settled.

That may be the best case, but why shouldn't the same happen to you.

We have a 6-month notice period for the current rental apartment.

Actually, every tenant in Germany only has a 3-month notice period.

Thank you for the information. I also do not expect any particular problems, but many have surely experienced this transition here, and I just wanted to check how the standard procedure is.

That is just as Caspar said. The notice period is a maximum of three months (less is possible) for the tenant. Landlords who want to terminate may have to observe longer periods, depending on the duration of the tenancy. Are you sure that the 6 months in your contract do not apply to the landlord? Is the contract already very old? Is it a form from the DMB or something similar, or something self-written?

I support. Three months is the applicable tenancy law.