The new Mayor of Dorchester has criticised Prince Charles' "model village", on the outskirts of the town.
Poundbury was conceived by Prince Charles to inspire town planning
Councillor Robin Potter, who took up the role on Monday, claims phase two of work at Poundbury had not followed the prince's ideas as closely as phase one.
He said large buildings "dominated" the skyline and views from Maiden Castle, a nearby Iron Age fort, were at risk.
A spokeswoman for the Duchy of Cornwall said close consultation with residents on future plans was still ongoing.
Mr Potter also said the plans were "drifting away" from Charles' vision of "a sustainable and inclusive community in Dorset".
"Phase One was very sensitively designed with regard to the original master plan by Leon Krier.
"Phase Two has not been so successful with that integration of smaller and larger houses and residential and commercial properties."
He said the development was very important to Dorchester but needed careful thought.
"Poundbury is very visible from Maiden Castle and the view needs to be sensitively treated and not dominated by too many large buildings," he said.
"The whole impact needs to be very carefully considered."
"Phase One of the development received great plaudits nationally and locally. I hope phase three will do the same."
David Evans, director of planning and environment at West Dorset District Council, said: "The district council is aiming to draw up guidelines on how future stages of the Poundbury development should be planned.
"We have been inviting everyone in the Dorchester area to have their say on this important matter.
"It's still very early days and there are many stages yet to come.
"Draft guidelines will be made available for six weeks in the autumn for the public to see and make further comments."
A Duchy of Cornwall spokeswoman added that they had always consulted with locals through the local residents' association.
Poundbury was conceived by Prince Charles to inspire town planning and design, after he criticised modern architecture.