Planning permission has been given to developers to concrete over Llandaff's green spaces despite the Cardiff Labour Council's planning framework using flawed figures.
Cardiff and Vale University Health Board has put forward the land at Rookwood Hospital as a future candidate site for housing.
Danescourt Woodland in the Taff River corridor is another site that has been proposed for future development.
Llandaff Conservative Councillor Sean Driscoll said: "With mass housing development in Cardiff West already approved by planners and a flawed Local Development Plan that grossly overestimated that 40,000 houses were needed, I question whether Llandaff needs yet more housing."
Matt Smith said: "There needs to be a full consultation for residents to give their views on how land should be used at the Rookwood Site."
A super surgery, a community hub or a library would offer more to the community than another housing development.
With the Labour-run Cardiff Council declaring a ‘Nature Emergency’, Danescourt Woodland and the Taff river corridor must surely be protected as steppingstones for wildlife and amenity space for residents, not concreted over.
We must preserve Llandaff's natural landscape.