An Bord Pleanála has upheld planning approval for the renovation and conversion of former stable buildings at the Killykeen holiday complex.
The park opened earlier this year under the Cabu by the Lakes brand, almost two decades after the park was closed by Coillte.
Killykeen Forest Holidays Ltd had applied to convert the stable buildings into guest accommodation, with further works to extend the building.
These included ensuite accommodation to new bedrooms, bicycle and bin storage facilities, the erection of a dining tent and other ancillary works.
Approval was granted by Cavan County Council last November, subject to a number of conditions. However, the development was then appealed to An Bord Pleanála by an R. Lee of Rathmines in Dublin.
They raised issues with the information submitted to Cavan County Council related to environmental reports the data submitted, describing the application as "poorly conceived and begs questions as to the ecological sustainability of an intrusive holiday complex in such a precariously sensitive location".
Representatives of the applicants refuted the claims of the environmental impact of the development and said the holiday park was originally built in the 1980s.
They also queried the grounds of the appeal and the motive behind it, saying the appellant's name "R Lee" saying "the initial R is not a name".
An Bord Pleanála granted permission for the project subject to conditions.
The Board said it falls within the Cavan County Development Plan, "would be compatible with the established use of the site" and would not seriously impact on visual amenities or the natural conservation of the area.