Zhèngfǔ bǎ zhège xiàngmù wàibāo gěi le yī jiā chéngbāoshāng.
The government outsourced this project to a contractor.
Tips
usage
承包商 covers construction contractors, IT contractors, military contractors, etc. For specifically a construction builder, 建筑商 (jiànzhùshāng) is more specific.