A proposal to replace a piggery in the Tamar Valley with a four bedroomed house is unlikely to gain planning consent.
The owners of Cold Harbour at Albaston sought pre-application advice over their plan to demolish the unused pig sty and build a house.
A Cornwall Council planning officer has told them that the construction of a new house in open countryside would be unacceptable in principle, having a detrimental impact on the surrounding area.