Ms Uluave said not all students were initially supportive of the petition, "but once they realised we were not petitioning to have all the toilets converted, most people only saw the positives".
Dr Barns said he had no issue backing the petition.
"The institute is about inclusion. The reality is we need to be able to cater for all our students and so if we are able to do something that will make everyone feel like they belong and are welcome at Waiariki, then we will endeavour to do so."
Dr Barns said by the same token, he did not expect every student to be comfortable using a unisex toilet but, for those who were, they would be available.
Ms Uluave said now her petition was finished, her next mission would be restoring student and staff representation on the institute's council.
Petition for unisex toilets at Waiariki:
* Launched in February
* Got 826 signatures
* Led by Waiariki's LGBTQ group and Young Labour Rotorua
* Promises to have unisex toilets in all new buildings