It works well with forecast rain for the month, to ensure that the new sections of the school are finished by Christmas.

School principal Chad Kentwell said it was great to see work chugging along so well, and explained some of what has been done recently.

"They've installed all the services into the building, all the plumbing, all the electrical, air conditioning and are starting to Gyprock the internal walls, so from there it's finishing the fitting out of the inside of the buildings," Mr Kentwell said.

"They're soon to begin preparing more or less the outdoor areas for pouring of concrete for a large COLA that's being built and they're also pouring concrete for verandahs and landscaping."

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The senior school is being built by Tamworth's Shay Brennan Constructions, which built the middle school in 2018. This was stage one of the expansion.

The Gunnedah school unveiled its grand plan for the future in 2017 and ventured into secondary schooling, introducing year 7 in 2019. Year 8 was added this year and years 9-10 are to follow in the next two years.

Mr Kentwell said he felt that they weren't just building the school, but also "continuing to build Gunnedah as well".

"It's good that the project has enabled us to keep the community working and being able to provide jobs for the local community and still been putting money into the local economy," he said.

The $900,000 construction of the senior school is within the existing grounds of the middle school in Little Barber Street and will include a specialised visual arts classroom, technology and visual arts break-out area, multi-purpose space, library, two regular classrooms, and a new administration area incorporating a staff room, work preparation area, offices for heads of school, reception and a sick bay.