The school buildings and facilities are located on spacious grounds. Wide verandahs and covered walkways allows students and staff to move around the school, sheltered from the rain and sun. An open courtyard, located between the main teaching blocks is covered with shadecloth sails and is landscaped with palms providing an attractive feature area in the school.

Katherine High School is designed to provide all the facilities necessary in a modern, comprehensive, co-educational secondary school. Specialist teaching areas for Science, Design and Technology, the Arts, Computing, and Physical Education are both well-designed and well-equipped with modern machinery and technology.