"组合式预制房" can be translated into English as "modular prefabricated house" or "modular prefab building".
"Modular" emphasizes the modular design or construction method.
"Prefabricated" or "prefab" indicates that the components are manufactured off-site and then assembled on-site.
"House" or "building" specifies the type of structure.
Both translations are commonly used and convey the meaning accurately.