In a world where everything consists of squares and cubes creating anything that s perfectly round in your minecraft world is impossible.
How to make a round roof minecraft.
Constructing a circle building a circle relies on techniques similar to those used.
Sufficient for one or two rooms.
Allowing for the very thick walls one gets in minecraft that give a usable internal space of 4 8 meters.
At smaller scales it is easier to correctly interpret a dome structure as curved but other curves.
If the curve radius is less than about six meters the roof will tend to look like a normal pitched roof with a strange mixture of pitches.
To get a roof that looks curved in minecraft you should generally expect to work on quite a large scale.
You can come close by stacking blocks.
The building in the image is 6 10 meters.