Electrical planning stair area + outdoor facility

a little OT:

Do you happen to know with what amount the electrical work is valued according to the standard construction service?
We had 2 offers here, they only wanted to credit us €2900 for the electrical work.
Although I come from the industry and therefore do not know the prices 100%, in my opinion no electrician can deliver a compliant installation for €2900.

Well, standard is not really much either. Unfortunately, however, you will not be able to influence the credits, as they are dictated to you by the construction company.

We will definitely use the electrician from our house construction company. On the one hand, we have great confidence in the standard of the construction company, on the other hand, we have consciously decided on turnkey construction. So far, we have not been disappointed by the individual trades (Subs) either, because they also know the standard of the construction company. We will of course have to pay for the electrician standard! But the outdoor facilities and later work will probably be done by a "local" from the region (possibly an acquaintance).

So, now about your staircase.

I consider using the living room lighting as stair lighting somewhat impractical, because this would require a very high light intensity, which would lead to absolute discomfort in the living area.

You correctly recognized the point about the motion detector; it might be possible to install the motion detector on the ceiling at the top of the staircase (360° ceiling mounting), then it would only detect the stair area below, but also people passing by. Good motion detectors have adjustable range.

My proposed solution:
A two-way switch for the staircase (switch down and switch up); the spots would be mounted swiveling and can thus illuminate the stair steps (there might possibly be a risk of glare). You could possibly install a swiveling lamp on the open front side of the ceiling above the stairs.
I would switch the gallery only from above, but it can also be switched together with the staircase. But do you always want (e.g. at night) everything brightly illuminated?

A small note:
There are too few power outlets in the living room.
How about a multimedia corner in the living room?
TV, AV receiver, Blu-ray player, game console, charger for universal remote control, subwoofer.
That’s already 6 power outlets (I would make these switchable from a central location).
Speaker sockets for a Dolby Surround system? Even if not necessary right now.
I miss network and telephone connections. (Network can possibly also handle telephone.)
In the coming years, network technology will increase even more, and implementing everything wirelessly is rather impractical and comparatively expensive.

An example of the future: network-enabled refrigerator. Nobody really needs it, but it will come that the refrigerator is able to order groceries independently.

Best regards

Sorry for all the typos. Hope it is still understandable.

Just came to mind: My neighbors have a similar staircase situation. The solution there was a wall outlet (almost on the left side of the stairs), where a huge stylish lamp hangs. However, the staircase is only open to the living area on one side. Indirectly illuminated stair steps would be another possibility. By using strain gauges in the bottom and top stair steps, the light could also be turned on via a timer when these steps are stepped on.

Today we were at the shell construction site: I noticed that the load-bearing wall (at the staircase) is wide enough to mount the switches on the end face. That would already be better.

provided the switch can clearly be assigned to the staircase.

If you also pair this with a stair spotlight and a spotlight in the gallery, you would have compact accent lights that also illuminate the staircase along with the traffic area, without having harsh main lighting (would then also be turned on during absence or during cozy stays. At night, going to the fridge would also be more pleasant). This light could then be switched centrally from the front door, the living area, and upstairs. Gallery main light then of course separately.

also a nice option. Thinking a bit further, you could use a relay switch to either turn on the entire accent lighting (always with priority) or with the staircase light switch only the lighting at the staircase (so subordinate wiring).

We already ordered an adjustable LED spotlight 2 weeks ago (5 watt LED, dimmable) to try out the light. Unfortunately, they are having delivery difficulties

That alone will not be sufficient in terms of brightness. Get informed about MR16 adjustable and LED spot GU10 2700K (warm tone) (e.g., from Philips). This solution is cheaper than ready-made adjustable LED recessed lights and does not require a transformer.

In the living area, a 3-way and a 2-way are planned for the TV technology. We currently have TV, receiver, Wii, and DVD on a power strip that can be switched separately. That is planned again... only that Wii and DVD come separately. Is that a bad idea? Should there be a switch for TV and co???

Why separate Wii and DVD? These devices only work together with the TV anyway?! Consider which devices absolutely need to work together; these then go on a switchable power strip. I hope you don’t mean those multiple sockets from the hardware store when you say power strip. In existing buildings, okay, but please not in new construction.

Additionally, we have LAN in the living, bedroom, and guest room. The telephone is in our utility room, and the WLAN system is also planned there.

LAN everywhere a TV, PC/MAC, router, laptop, etc., can be placed. Maybe even once for the fridge . Don’t forget the garden; via an outdoor socket, the WLAN can then be easily expanded.