Landsdale Gardens Adventist School principal Mark Foster said works on a high school building began in April and would be completed by the 2016 school year.
He said the $2 million two-storey facility being built by TM Construction included classrooms, general learning areas and space for art, science and food.
�We�re up to pouring the suspended slab at the moment; we�ve got the roof going on in the next week or so and windows in the next month,� Mr Foster said.
�At the moment it�s choosing internal colours and flooring so the interior design.�
He said the second stage of the plan included the construction of a $2 million early learning childhood centre.
�So a K-2 building and we�re looking at getting that right out the front of our property just to get the exposure � we�ve got a 40,000sq m footprint and we�re only taking up a small percentage at the moment,� he said.
�We�re just going to build out towards the road so people don�t drive past and wonder where we are.�
The Queensway Road school, which has operated as a primary school for more than 20 years, was given Government approval for high school enrolments two years ago and currently caters for students up to Year 10.
�From 2013 was our first high school year and then 2014 we had Year 9s and then our Year 10s in 2015 and then next year we�ll have Year 11s, so by 2017 we�ll be a K-12 campus,� Mr Foster said.
�We�re basically getting the infrastructure in place so this building will handle the growth that we currently have and expand our high school program.
�Our next building will be in about two years time, so every two years we�re looking at adding on some new infrastructure to sustain the growth.�
He said the school was also expanding the play space for the kindergarten and pre-primary students and the Year 5 and 6 students were creating a garden.
�Where we are situated is a growth area and we have a few other Adventist schools in WA � there�s only one other high school, which is in the Hills � so we were really keen to establish another Christian school in the northern suburbs,� he said.
�For however many years we were just K-6 but now we�ve got the opportunity to expand to high school and cater for a different need.�
The school will hold a car boot sale on Sunday, September 13.