Auckland Grammar School is seeking a further $1.7 million for its new $6.4 million classroom project where construction is well advanced.

A spokeswoman said building work was up to the final level three and due to be finished about February.

The project is a 12-classroom block with three teacher resource rooms and a tuck shop, built adjacent to the school's historic main block.

Watts & Hughes Construction is the main contractor on the project designed by Architectus and employing more than 30 subcontractors.

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The Ministry of Education is funding about a third of the total building cost so the school has a $4 million fund-raising project under way, the biggest in its history.