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‘If 1.5m Germans have them there must be something in it’: how balcony solar is taking off
(www.theguardian.com)
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I haven't numbers or data, so just from personal point of view: Lax building code as in you can build the weirdest looking building in the middle of a forest, yes. The 60s to 90s were like that.
But the building always had to be up to code: if you wanted electricity, it had to be up to code. If you wanted water, you also needed correct sewage. Transactional, in a way.
The first, buildings whereever, has also changed, gradually, since the 00s. "Betonstop" is the name used, translates to "concrete stop".