A couple objecting to the Prince of Wales' plans to alter his country retreat in Carmarthenshire claim he is being given preferential treatment.
Home Farm includes 192 acres including woodlands
Kerry and Jacqueline Thompson have opposed the bathroom extension, barn conversion and two new dwellings at the £1.2m Llwynywormwood estate.
They say it breaches regulations which stopped them building on their land.
Prince Charles' application was deferred for a report on how bats would be affected by the development.
Once the report is being compiled and the application comes before them again council officers are recommending approval.
Mr and Mrs Thompson said they had fought a long-running battle for permission to build a dwelling on their land at nearby Llanwrda, for his brother and his three children.
Mrs Thompson said: "The policy of not being allowed to build in open countryside seems to have been cast aside - this application seems to be getting preferential treatment."
Her husband added: "I've got nothing against Prince Charles moving to the area - he seems a nice enough lad.
"But there seems to one rule for one and one rule for another
"My brother is a forestry worker who has lived in Carmarthenshire all his life - my brother even told them he would not sell the property - they could put a clause in that it would be kept in the family.
"What the prince needs the accommodation for is up to him - why can't my brother live in the area where he was born and bred?"
Prince Charles and the Duchess of Cornwall, who are in Anglesey and Bangor while on a four-day tour of Wales, bought the house as a base for when they visit.
The royal couple enjoy a laugh on a visit to Ystradgynlais, Powys
During the periods they are away, they intend to allow holiday lets on the estate, near Myddfai.
The application, submitted by the Duchy of Cornwall, seeks permission for a bathroom extension at the existing farmhouse.
The Prince also wants to convert an adjoining farm building to a dining room and reception and build two new dwellings to replace a barn.
When the application was submitted in April a spokesman for Clarence House described the work as "minor".
"Some conversion work is planned to the north range to create business meeting facilities and to enable the three-bedroom cottage to be let as part of the Duchy of Cornwall holiday cottage portfolio," he said at the time.
"Additionally the west range will be rebuilt, following the historical footprint of the structure, to provide further living accommodation."
Cadw has submitted a letter stating it "strongly supports" the demolition of the "modern farm buildings" and their replacement.
A spokeswoman for Carmarthenshire Council said: "The planning committee deals with all applications in accordance with planning rules and regulations.
"The Llwynwormwood application will not be treated any differently to any other application and the proper procedures have been, and will be, followed at all times."