ᐅ Retrofit light switch in basement concrete wall?

Hello everyone,

We are currently having a semi-detached house built by a developer, and the electrician is included in the contract. After a meeting at the shell stage with the electrician, he told us that he no longer installs surface-mounted switch boxes in the concrete walls of the basement hallway because he has previously had problems with the developer there. He refuses to do it altogether.

However, we would really like to have one surface-mounted light switch in the basement hallway.

Would it be possible to install the surface-mounted switch after the electrician has finished and set the switch access point?

PS: Our neighbor is doing the electrical work himself and has installed the switch directly surface-mounted as well as all the boxes in the basement (it looks like they were chiseled out).

Thank you very much.

Best regards,
Rene

benkler1401 schrieb:
He completely refuses.
However, we would really like to have one flush-mounted light switch in the basement hallway.

Would it be possible to install the flush-mounted switch after the electrician finishes and installs the switch access point?

The switch also requires the wiring, which runs flush-mounted in the chase or conduit. Simply lowering the switch box is not sufficient. But could he have valid reasons for his refusal? - see here: https://www.hausbau-forum.de/threads/wu-beton-und-unterputzdosen-im-wohnkeller-wie-kann-man-das-loesen.24640/

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@11ant of course, it depends on whether we're talking about interior walls or exterior walls. Not every waterproof basement is built entirely with concrete inner walls; you can also use masonry inside.

Alex85 schrieb:
Not every waterproof (WU) basement is fully made with concrete interior walls; you can also build with masonry inside.

I know. But this is about a concrete wall—we don’t know if it’s an exterior wall. Maybe the electrician was put through such a thorough briefing that now it makes no difference to him.

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https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/

This is an interior concrete wall (load-bearing wall). According to the builder, however, a single flush-mounted switch should not be a problem.
As mentioned, the contractor installed it flush-mounted with the approval of the site manager...
I forgot to mention that the electrical wiring will run along the back wall in the basement room and will then be drilled through the concrete wall to reach the switch on the southeast side...

PS: The electrician would have to pay a large sum of money because he installed several flush-mounted boxes in a load-bearing concrete wall, which compromised the structural load capacity...