ผู้รับเหมา

Since the contractor is ready, the maintenance will begin tomorrow.

By the way, has the contractor been selected yet?

The contractor absconded with our labor cost and ran away.

If I had known, I wouldn't have hired a contractor who works this shoddily.

Let's just say that the contractor both concealed defects and defaulted on the contract.

Supposing that the contractor defaults on the job, we can sue in court.