Construction costs are currently skyrocketing

Thank you in advance for your answers. I don’t plan to install a wallbox for the time being. I will have a plug-in hybrid soon, but it can also be charged overnight using a normal socket, right? The "preparation" is only about the empty conduits to the starting point, correct? The cables and the wallbox itself would then be the final installation, right?

The developer charges almost 5,000 euros for a fully installed wallbox. That’s too expensive for me and I (currently) don’t need it.

A photovoltaic system is definitely planned for the future. If I don’t commission the "preparations," will it be significantly more expensive later on?

We had an outdoor Schuko socket installed, connected with 5x2.5 mm². In the box, it is protected three-phase with its own RCD. Initially, only one phase of the Schuko was used; the cost was around 150 euros. We have since been able to connect a wallbox with 11 kW to it (22 kW would require a thicker cross-section).

For photovoltaics: the electrician was commissioned to install an empty conduit, M32, which he ran with some surplus from the distribution board to under the roof covering. We also commissioned the roofer to install the conduit through the roof covering in a second step and to seal it at the top with a sealed sleeve. The total cost was also around 150 euros.

If you need more than one string later (one per roof side or roughly every 50 m²), get a thicker conduit or even two right away. And make sure the electrician does not make the bending radii too tight.

I only just now see that I misread your question a bit. So we have no time limit for construction. That would also be a criterion against purchasing the plot for us.

I can well understand that. We are also undecided. Construction must probably start within 2 years for us (can probably be extended)...

Just have a CEE socket installed at point X. When the heat pump arrives, only the socket needs to be removed.

We had an outdoor Schuko socket installed, fed with 5x2.5 mm2. In the box it is three-phase protected with its own RCD. Initially, only one phase of the Schuko was used; it all cost around 150 euros. Meanwhile, we can easily connect a wall box with 11 kW to it (22 kW would require a thicker cross-section).

For photovoltaics: the electrician was commissioned to install an empty conduit, M32, which he laid with some overhang from the distribution board to under the roof covering. We also commissioned the roofer to install the empty conduit through the roof covering in a second step and to seal it at the top with a sealed coupling. The total was also around 150 euros.

If you later need more than one string (one per roof side or roughly every 50 m2), take a thicker empty conduit or even two. And make sure the electrician does not make the bending radii too tight.

Thank you very much. I will ask how exactly the "preparation" looks like and partly mention your points. I am inexperienced here. They will probably just answer "an empty conduit will be installed, etc." So right, even if it gets expensive -> have empty conduits installed?

I'm an amateur here. They will probably just answer "a conduit will be laid, etc."

then define exactly what you want: 2x conduit at least M32, laid up to above the roof covering and sealed cleanly there.

You could also have 3x4 mm2 or even 3x6 mm2 photovoltaic cables installed right away, then there will definitely be no problem pulling them in later.

So really, even if it's expensive -> have conduits installed?

Somehow the electricity has to get from the roof to the connection box - and if it's a surface-mounted cable channel running along the facade and then with a core drill to the main distribution board, that's possible but still annoying from an aesthetic point of view.

We also simply had 2 empty conduits installed from the utility room to the attic back then. When we got the photovoltaic system 4 years later, the solar installer was definitely impressed. He said it was still rare that this was considered when the photovoltaic system was not installed directly with the house construction. For him, it was definitely a great relief.