- The house is very old. It needs repairing before you sell it.
- The house is very old. It needs renovating before you sell it.
- The house is very old; it needs renovating before you sell it.
- The house is very old. It needs to be renovated before you sell it.
- The house is very old. It needs to be repaired before you sell it.
- The house is very old; it needs repairing before you sell it.