BLACKTOWN Council staff have recommended an appeal to the Land and Environment Court to defend a decision to refuse a development application for a Plumpton school to expand.
Western Grammar School in Cannery Road (pictured) wants to replace a single-storey classroom with a two-storey classroom building.
It would have six classrooms, library and computer room, toilets, a staff meeting room and a kitchen.
The school wants to increase student numbers from 125 to 320 and have five additional teachers.
It appealed to the Land and Environment Court after the council rejected the proposal on the grounds of noise, traffic and visual impact.
The council received submissions from residents about increased noise and traffic since the school opened in early 2012.
A council report estimated an appeal would cost $60,000.
"It will be necessary for council to engage external experts in traffic, acoustics and town planning to assist in council's defence of the appeal," the report states.
The council rejected an original proposal in 2011 for a school with 125 pupils to be established at the site.
Western Grammar won a Land and Environment Court appeal and opened three months later.
Councillors will discuss the report at tomorrow night's council meeting.