Sell old house, build new one, how to finance?

...we have decided to build again and sell our house built 14 years ago.

Has anyone of you done this before?
Do you have any ideas on how to approach this?

You can already sell today and stay as a tenant until day x (=move). That will cost you a small discount, but in return you have clear security about what your sale brings and can save yourself the bridging finance.

The bridging finance is clearly much better. Or you have a property that the owner wants to rent out anyway (e.g. condominiums). Then you can certainly arrange to remain a tenant for a certain period. That would certainly be the most elegant solution. However, you have to find a buyer who buys the property only to rent it out. With a typical single-family house in many locations, that’s not so easy.
If the buyer wants to move in themselves, there are numerous problems, which leads to the fact that almost no one actually does that.

If it is a period of 1, 2 years, many people do that. Depending on supply / demand,...

Hello,

we have decided to build again and to sell our house that we built 14 years ago. We estimate to get 300,000 euros for this house (40,000 euros remaining debt).
We have equity of 180,000 euros to buy a plot of land.
For the house, we first calculate costs of 350,000 euros including incidental costs. So we would have to finance 100,000 euros as an annuity loan.
The problem now is the missing approximately 250,000 euros, which we will only get once the house is sold. However, we would have to move out and rent an apartment in the meantime.
Are there other options? The bank will not lend us 250,000 euros that we have to repay all at once in a year, will they?
Has anyone of you done this before? Do you have ideas on how to approach this?

Best regards
Sabine