I know the building regulations only allow you to build on 10% of the land, but I was wondering if a sunroom or conservatory falls under the same rules since most don’t have underfloor heating?
Has anybody built a sunroom/ conservatory?
Not sure why you link underfloor heating to it, it’s got nothing to do with it at all. We were subject to the same rules when we built an extra ground-floor room for the heating installation.
I’ve not built such a thing in Switzerland, but in the UK and France they’ve not been subject to planning permission, in the first case because of the relative size (I think - did it twice but a very long time ago) and in the second because it’s inherently a temporary structure, a pool cover with moveable panels, so its size is irrelevant.
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This “For municipalities with a utilization factor: These winter gardens do not have to be counted towards utilization up to 10% of the total eligible floor space” suggests they do not count in Canton Zürich but you would need to check your local regulations: https://www.zh.ch/content/dam/zhweb/bilder-dokumente/themen/planen-bauen/bauvorschriften/bauvorschriften-im-energiebereich/energetische-bauvorschriften/merkblaetter/merkblatt_wintergarten_aus_rechtlicher_sicht_ktzh_juli_2009.pdf
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