The $2.8 million complex, officially opened on Friday, has three general learning areas, an open learning area and the ability to close off single learning spaces.

An 18-month staged construction was completed last year, to the joy of 11-year-old year 6 student Tyler Lieschke.

"Being through the process of it all, it was great to see it all coming together," he said.

"We had to go through all different entrances, and then all our bags spots were different because all of it was being moved around, and we just had to be flexible.

"The oval's got more grass on it now, now that all the trucks aren't going through, so I was pretty chuffed about that."

At one point during construction, three cohorts of students, administration staff, first aid and the office of principal Josh Gaynor were co-located in the one building.

"The adaptability of the families and the children especially really went a long way," Mr Gaynor said.

"It's funny - our largest intake over the last five years has come at the height of our building, where we were crammed in together.

"I really don't believe parents choose schools due to facilities, but it can only help.

"We've always known we've provided a strong education for children that come here, but to have the facilities that match that is a real blessing."

Mr Gaynor said the new complex enabled 21^st Century learning for their 54 students.

"The building that we're opening today ... we can fit our whole school in, but we also have another multipurpose space which our current five-six class is in, just to allow that flexibility," he said.

"Our school used to be a big 'U', and trying to create a community in the shape of a 'U' is very difficult, so to have a space that is so inclusive and open is exactly what we're about."

Mr Gaynor said the rebuild had been an involved process initiated before he arrived, in 2017.

"Our Diocese works closely with Catholic Schools NSW to apply for the federal block grant," he said.

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"Our process started many years before any turn of soil ... I understand it is quite a difficult (grant) process, so I was very fortunate to come into the role after that had been secured."

Farrer MP Sussan Ley said the federal government provided $875,139 towards the project through the Capital Grants Program, which provides funding for non-government schools to improve capital infrastructure.

"It's a terrific partnership when a small school in a Catholic Diocese is able to realise the same opportunities as a big school somewhere in Sydney or Melbourne," she said.