A plan to build 42 eco-homes in Heath has been described as a “carbuncle” by elderly residents living in nearby bungalows.
The Heath Residents Association (HRA) said the three-story high build on Allensbank Road will reduce natural light and have an impact on existing residents.
But Independent Councillor for Heath, Fenella Bowden, said the HRA are scaremongering.
The application for the self-sufficient houses and flats will be heard at Planning Committee next week.
John Jones from the Heath Residents Association said he has received hundreds of complaints from residents.
Mr Jones said: “The main concern is that they are going to build high density here.”
“The three story block of flats will be overlooking bungalows in which the resident are disabled, many of them are elderly and they are all vulnerable.”
Carol Hall and Jane Urquhart live in bungalows that back onto the proposed site.
Mrs Urquhart said: “We feel horrified by it. I think they are putting up too many.
“I think a lot of people here are defenceless because they can’t fight anymore.”
Mrs Hall said: “It’s also the fact that nobody over there, the planning people, have bothered to turn up and talk to anyone about it.”
In a statement the developer, Wates Residential, said the properties will be in-keeping with the surrounding area and have been designed taking neighbouring homes into account.
Councillor Bowden said safeguarding vulnerable people is a priority: “I have worked for a long time with the older and disabled people who live in the bungalows, and they have been scaremongered frankly.
“They are not going to have their privacy compromised.
“The suggestion from the Residents Association and the petitioners that in some way that the council hasn’t taken any account is absolutely not true. Safeguarding is our number one priority when it comes to protecting vulnerable people in that area.”
Cardiff Council would not comment on a scheme going through the planning process.
The planning application will be heard at Planning Committee on 7th February.