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In Hungary we had house templates since the socialism.

(following sites are in Hungarian)

https://www.leier.hu/tipushazak

These are prefab houses. They are built in factory and then pieced together on site. What the poster was asking for was free/cheap plans to build a house, without support.

Kind of like open source design of a house.

Only the Leier one is prefab, the others are from protherm (clay) brick. And yes the planes there aren't free.

However there also exists a state level catalog of free (open source) templates as well:

https://www.oeny.hu/oeny/nmtk/mintatervek

It seems it's only available for Hungarian citizens, as it needs Hungarian Electric Id to login. I'm not sure it qualifies for open source but it's free as in beer to Hungarian citizens with the right to adapt the plan to your demands.

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