ᐅ LAN cabling in a single-family house (prefabricated home)

Hello to all home builders and possibly also to electrical experts,

Since I haven’t found anything about this online or in forums, I’m posting the question here again.
We have contracted the interior work through the general contractor, which unfortunately includes the electrical planning. Of course, the standard package does not include any LAN cabling, which the electrician charges extra for. Is a price of 300 gross for positioning the CAT7 cable and pulling it through a house with a floor area of 130 sqm (1400 sq ft) reasonable or too expensive? (Only one LAN cable; the price doubles for two.) Terminating the data cables and installing the network outlets is charged separately.

We are getting a prefab house (timber frame) with a ground floor and an upper floor (attic). The plan is to have the phone hub in the utility room, installing a router and a switch there, and from there to connect the rooms with double outlets and double CAT7 cables.
The electrician charges quite a high price for this and, what confused me greatly, wants to run the LAN cables inside conduit (empty pipes), supposedly for protection. However, despite the conduit, you would not be able to replace the cables later! Does this make sense? Is there a relevant DIN standard or is it common practice not to lay the cables openly? Who has experience with this or has already done it this way? So far, we have only arranged for the pulling in of the cables with termination on the outlets. The rest of the work in the utility room has not been included yet!

Would it possibly be feasible for a layperson to do this work themselves? The ceilings are still open, the cables will be laid along the rafters, and horizontally there are installation cables or the walls are not insulated everywhere, so cables can be pulled there.

Thanks in advance for professional feedback.

Best regards,
Charly

The current standard is to install network and coaxial cables within conduit.

The reason for this is that these types of cables should not be bent or distorted. Typically, the conduits should also be installed in a way that allows the cables to be pulled through easily. In other words, proper bending radii must be observed during installation.

That is not the reason... you can bend the cables as you like, as long as you follow the manufacturer's installation guidelines... the reason is, as described in DIN 18015, that data cables can be installed in a way that allows them to be replaced.

CharlyC42 schrieb:
However, even with the empty conduits, you wouldn’t be able to replace the cables later! Does that make sense?

The empty conduit, yes, but not that statement.

For double outlets, I would also install double cables. Structured cabling is usually fully installed from the start; Cat7 and Gigabit standards also imply this. Cable sharing is generally not planned.

Pulling two cables either requires no additional effort (if pulled together) or a lot more work (if the empty “conduits” are just small tubes). This is a task for an assistant. Connecting the cables to the outlets and the patch panel is more of a specialist’s job.

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That is all assistant labor. However, 300€ is not a huge amount; it probably depends on the cable lengths and the number of outlets. Labor is also not free.

Um, 300€ for all the cables together, right? At first, I thought that was the price per cable. That would of course be ridiculously expensive. For all of them, on the other hand, it’s quite reasonable, especially if slot chiseling, installing boxes, etc. are included.