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The phrase "are difficult to build" is correct and usable in written English.
It can be used when discussing the challenges or complexities involved in constructing something, whether it be a physical object, a system, or an idea.
Example: "The new software features are difficult to build due to the intricate coding requirements."
Alternatives: "are hard to construct" or "are challenging to create".
Exact(21)
Yet, strong opening sales are difficult to build without radio and video exposure.
However, they are difficult to build and are usually domain-specific.
Manycore FPGA prototypes are difficult to build, but they offer great rewards.
Shields are difficult to build because of pipes and control rods.
But cases are difficult to build, said Ric Cantrell, a spokesman for the Utah attorney general's office.
Artificial neural networks (ANNs) have been successfully used in nonlinear systems whose models are difficult to build.
Similar(39)
"The set was difficult to build and I liked the accomplishment when I had finished building and could play with it".
It is difficult to build a team".
It's difficult to build a relationship with a mother.
It is difficult to build in New York as it is.
Why has it been difficult to build a coalition to fight ISIS?
More suggestions(13)
are difficult to acquire
are tricky to build
are difficult to achieve
are difficult to implement
are difficult to assemble
are difficult to construct
are difficult to reconstruct
are difficult to devise
are tough to build
are eager to build
are difficult to cultivate
are difficult to forge
are necessary to build
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com