Wallbox preparation garage, new construction

I’ll join in as well. We are currently planning our prefabricated house. The architect is submitting the building application initially without a garage. Here in NRW, we can still build a garage up to 30m² later without a building permit, as long as it is within the development window and plan. Our utility room is at the front left of the house, the garage will (if it should come later) be built on the right side of the house. It will probably come down to a prefabricated garage. Also on the right side of the house will be the kitchen. Can you then "simply" run a high-voltage cable from the kitchen to the garage? Who do I commission and when? We are building turnkey, so I as the client have no direct contact with the (sub)contractors. And how do we even get electricity (for the gate, lighting) into the garage? The prefabricated garage providers make it easy for themselves and say that they do not connect the electrics, this is the responsibility of the clients. But once the garage is there, it’s too late to get electricity there somehow.

Just because you build turnkey doesn't mean you don't have contact with the subcontractors. Or do you mean you are building with a developer?

Who else do you do the electrical planning with? Switches, light outlets, etc.? Exactly there you should also be able to say at which points on the outside of the house you need which connections/cables.

You can't just run a high-voltage cable from the kitchen to the garage. A wallbox needs a separately fused connection; it can't be connected to the cooktop...

Just because you build turnkey doesn’t mean you don’t get any contact with the subcontractors. Or do you mean you are building with a property developer?

With whom are you doing the other electrical planning? Switches, light outlets, etc.? Exactly there you should also be able to say at which points on the outside of the house you need which connections/cables.

You can’t just pull a high-voltage cable from the kitchen to the garage. A wallbox needs a separately fused connection; it can’t just be connected to the cooktop…

Okay, thanks for the answer. No, we are not building through a property developer, but normally with a prefabricated house company. Yes, we still have the electrical planning; that would of course be an idea to address it there. I actually thought that you only determine where which socket / light switch goes, etc.

Okay thanks for the answer. No, we are not building through a developer, but normally with a prefabricated house company. Yes, we still have the electrical planning, that would of course be an idea to address it there. I actually thought that you only decide where which socket / light switch goes, etc.

Put simply, during the electrical planning you discuss where which cables are laid. Surely it won't only be sockets and light switches. Ceiling and wall outlets, network connections, indoor and outdoor stations of the doorbell, terrace and garden lighting, etc. And that's exactly where you can also mention that you need the necessary cables at the position of the later garage. Ideally not just one (sufficiently dimensioned) power cable, but also a network cable to make the wallbox controllable.

As I already wrote above: Depending on the chosen wallbox, an additional data cable (RS485) may also be useful. Otherwise, I would definitely make sure that the cable used is thick enough. For an assumed cable length of more than 10 m from the HAR to the box/garage, I would probably go straight to 10 mm². Then you are also on the safe side if it should be a 22-kW box. (However, this one is not subsidized.)

Hello Marko,

you can decide all of this with your prefabricated house company (which one?) during the sample selection.

Here you go through every socket, every cable, water connections, etc., step by step together and then determine that a cable (preferably really 6-10 mm²) should be laid/led out on the corresponding outside right side of the house.
They will probably run it through a conduit out of the house. Here you can also have a LAN cable (ground cable) laid directly.
The electrician who later connects the wall box will then connect the cable to the fuse box, etc....