Mr Shore said the buildings were important for the school's direction.
"Our performing arts is strong, and growing - and of course our kapa haka is top quality. So having the best space we can is really important."
Mr Shore said having a construction site at the school was "a bit of hassle" - but it would be worth it.
"We will have these lovely buildings to come out of it, so we don't mind."
The buildings are due to be finished by Christmas, and will be formally opened in January.
Mr Shore said this was only stage one of the full re-development.
The second stage - which will start in December - will see two new computer suites and a health office at the school. This will be followed by stage three, in which a block of classrooms will be gutted from the inside and re-built.
"Hopefully everything will be finished by 2019."