The facility has teaching spaces for art, photography, dance and drama.
It also boasts performing spaces with sprung floors designed specifically for teaching drama and dance, and has 120 retractable seats.
That space already has a professional seal of approval, the Royal New Zealand Ballet having held a workshop in it.
It will also be available for community use.
"We talked about how do girls need to learn in the future, how do we need to teach them, and therefore what spaces do we need," principal Jackie Barron said.
"Rather than building a space and saying `Here it is, now teach in it', we have said what is fundamental, which is learning, and we will teach as they have to learn."
The former arts classrooms have now been assigned to years 7 and 8 pupils.
"Cleaning out that space has transformed it; it is all about keeping our buildings flexible and suitable for future learning."
Ms Barron said the new creative arts centre was the first in a series of major building projects at the inner city school.
"The old drama space we want to convert to a library and connections hub with a canteen, teaching spaces, and break-out spaces.
"We also need to enlarge our chapel, because we can't fit the entire school in our current chapel.
"It is exciting, but it is also a major commitment financially."
