A £25m plan to merge two comprehensive schools in Carmarthen serving 1,700 pupils was approved on Monday.
Governors at Queen Elizabeth Cambria and Maridunum schools, currently on neighbouring sites, had already backed the scheme to create one school.
It is part of Carmarthenshire Council's controversial shake-up of education in the county.
Senior councillors approved the move which would see new classrooms and facilities built on the existing sites.
" The proposal is aimed at providing secondary school pupils with improved educational opportunities and superior facilities "
New buildings will be phased in with existing accommodation used initially.
A new sixth form block for 300 16-to-19-year-olds would be built within two years.
New buildings for around 1,300 younger pupils would be completed by September 2008.
The council's executive board gave its blessing on Monday and the Welsh assembly will now be notified of the merger, which will come into force on 1 September this year.
Education director Alun Davies said no objections had been received during the two month statutory consultation period.
He said governors of both schools had voted unanimously in favour of the merger.
"This is the way forward," he said.
"The proposal is aimed at providing secondary school pupils in Carmarthen with improved educational opportunities and superior facilities, and it retains all that is sound and valued within the two existing schools."
It is one of the first in a series of school mergers, closures and new builds planned for the county.
Others are likely to be more controversial with protests already held outside county hall.
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