Alternatives to the Dixi toilet?

We currently have a toilet from Mobi, €80 per month with weekly cleaning.

If that is not included in your [Bauleistungsbeschreibung], you will probably have to organize it yourself and bear the costs.

With our [GU], the port-a-potty was included.

The construction companies that don’t include that probably had to attract customers with low prices (the only reason something like that isn’t included, for example) and then make up for it at the end.

Well, that should be stated in the construction service description, which you should really read before signing. If someone tries to charge you extra at the end, something already went wrong beforehand. We talked about that with our construction company beforehand and I found it better to organize the thing myself. Otherwise, usually it’s taken away once the construction company’s craftsmen are done. If it can be arranged like with toxic, that’s fine too. The thing is long-term rental is simply cheaper. And if you then briefly need a toilet afterward, the price is quite unappealing.

Into the bushes....

4 months = 350 euros net / every additional week thereafter 25 euros net

ToiToi Dixi I believe...was provided by the structural builder.

well, that should be stated in the construction service description, which is better to read before signing. If someone comes up with that afterward, something has already gone wrong beforehand

not everyone knows that a toilet must be available. if it is not mentioned even with one word in the construction service description, the surprise comes at the end. there are quite a few construction companies that cash in after the signature. good construction service descriptions, for example, provide information about which additional "hidden" costs will still come up. a fair construction company has no interest in scamming the builders after signing or even driving them into bankruptcy. not everyone can provide additional financing, and the construction company also wants the last invoice to be paid.
here it is only a portable toilet, that should be doable. but whoever does not provide a portable toilet will certainly also save on other things that are practically absolutely necessary. and that can quickly add up.