짓는 게

building

→ 짓다
phrase Rare #27,008
building 게 is a shortened form of 것이, making the action the subject or object of the sentence. 짓다 can mean to build or create, depending on what is being made.
KO: 집을 짓는 게 생각보다 오래 걸려요.
EN: Building a house takes longer than I expected.

어둠 속에서 개처럼 짓는 게 누굽니까?

Who is barking like a dog in the darkness?

— 나이트 워치 (2004)

발전소 짓는 게 그렇게 단순한 사업은 아닌데 말이죠

Building a power plant isn't exactly a simple undertaking.

— Pandora (2016)