Council officers have refused to grant planning permission for a proposed house extension at Dock Road in Tweedmouth.
An application had been lodged to add a bedroom and increase the size of other rooms in a bungalow on the junction with Tower Road overlooking the Tweed estuary.
Two objections were made by neighbours with concerns about impact on the conservation area.
Planning technician Esther Beauchamp said: “The site forms part of a range of low density housing...that makes a positive constribution to the character and appearance of the conservation area.
“The proposed extensions and associated works, by virtue of their layout, scale, form and appearance, would not enhance or make a positive contribution to the Tweedmouth conservation area and would have an adverse effect upon the character and appearance of the existing property.”