Electrical concept for outdoor facilities

I have been thinking a bit about the outdoor facilities today and have a question about the electrical system. Currently planned are a garden shed, carport/garage, and possibly an outdoor sauna if there is money left in the end. Of course, the whole thing also needs a bit of electricity:
- in the garden shed, there should be a workbench, and there definitely needs to be power for various tools. For garden equipment, a high-voltage connection might also not be a bad idea, but I am a bit unsure about that
- in the carport, currently only a lamp is needed, but since we are all supposed to drive electric cars soon, I would definitely plan for high power demand there
- the sauna is planned to be electric because it is more convenient and there is no chimney sweep, also high voltage
- lamps for the driveway are unnecessary since we plan a short driveway and a light from the carport/garage is sufficient; the same should apply for the path to the front door

Now the question is a bit about how to do this most cleverly. One possibility would be to have the construction partner lay 3 cables outside. That is probably not cheap since high voltage is needed everywhere. But it would also have the advantage that the garden shed could be switched off from inside. The other idea would be to lay only one three-phase cable outside at first and install a sub-distribution board in the garden shed to which the rest would then be connected. But I am unsure if that wouldn’t cause more costs in the end

Both approaches have advantages and disadvantages. Get a quote for both and then decide.

Ultimately, it depends on the connected load and the required lengths. Do not save on the cross-section.

Additionally, also think about the internet, for example for internet radio in the garden house or for the [Wallbox] to be able to check charging levels. Either simply install an outdoor access point on the house that provides Wi-Fi across the entire property or have LAN cables laid to those locations.

I find one or two sockets in the carport for vacuum cleaners or [Kärcher] quite helpful. However, I would make these sockets switchable from a locked room.

Pulling LAN cables is a good point. Since I wanted to dig the trench myself anyway, it can be done at the same time.

Both approaches have pros and cons. Get a quote for both and then decide.

What are the pros and cons? And how complicated is it with an intermediate distributor and a branch? I'm a software person and this is clearly a hardware problem ;)
We are still quite far from getting concrete offers for that. First, we need to decide on a construction partner. Nevertheless, I will let this flow into the next discussions.

Hi,
I would lay a separate underground cable 5x1.5mm², better 5x2.5mm² each.
Each individually fused in the meter cabinet.
Parallel to that, a sturdy 32 duct with pull wire each.
You can then pull all sorts of things in there later.
And very important! Don’t forget the WLAN cable.
Best regards, Olli

Are you also planning an automatic irrigation system, [Zisterne], well...? For this, electricity and control cables would also be necessary.