Pennant Hills High School offers many subjects, with the faculties including Social Sciences, Science, Agriculture, English, Music, Christian Education, History, Maths, Visual Arts, Industrial Arts or TAS, Languages and Physical Education.

Pennant Hills High School contains a multi-purpose centre (Robert Stacey Hall), new Design and Technology/Visual Arts buildings, the Alfred Gray Memorial Library, and many specialty rooms including science labs, cooking and computer rooms.

An agricultural plot is located at the rear of the school, housing crops, sheep, chickens and other livestock.

The school's buildings were constructed according to the hilly terrain of the area, so that there are no more than two levels at any single point.

Also as a result of this fire, many portable classrooms were set up for a number of years, near the main oval and where the COLA (Covered Outdoor Learning Area) is now situated.

The school now has had an elevator installed between levels 2 and 4 (for use by disabled or injured students), and a new Design and Technology and Visual Arts building.