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Provision is obligatory - and meanwhile set in stone for the whole European Union:
"The existence of high-speed electronic communications networks up to the end-user should be facilitated [...] in particular by high-speed-ready in-building physical infrastructure. Given that providing for mini-ducts during the construction of a building has only a limited incremental cost [...] all new buildings or buildings subject to major renovation should be equipped with physical infrastructure, allowing the connection of end-users with high-speed networks."
(Extract from the EU-Directive 2014/61/EU)