If you are talking about the structure block build limit, that can be worked around if you search for it, if you are talking about the world height build limit, that is harder to work around, but it is possible with some custom coding. Also, there is a single line of code that is fairly easily marked in custom dimension code, if you want it for a custom dimension. Other people can explain all of these methods more clearly than me, and you can likely find more about them by searching on the forums.
If you are talking about the structure block build limit, that can be worked around if you search for it, if you are talking about the world height build limit, that is harder to work around, but it is possible with some custom coding. Also, there is a single line of code that is fairly easily marked in custom dimension code, if you want it for a custom dimension. Other people can explain all of these methods more clearly than me, and you can likely find more about them by searching on the forums.