Technology is one of the most popular optional subjects for students at the school. Each year Drimnagh Castle has one of the largest number of exam canditates in the the country going forward to sit their Junior Certificate exam. Following the indroduction of the new Technology Leaving Certificate syllabus in 2007, the existing Technology Workshop underwent a refit of tools and equipment with the aid of funding from the Department of Education and Skills. To cater for the huge popularity and demand from students for the subject, a second Technology Workshop was built in 2009. The school now has two fully equipped Technology labs catering for Junior and Leaving Certificate students each year.
As well as offering a practical environment for the students, both Workshops have data projectors and Internet access to facilitate the teaching and learning of subject theory.
In 2007 the school applied to the Department of Education and Skills for funding to implement the new Leaving Certificate Design and Communications Graphics syllabus. This syllabus replaced the Technical Drawing syllabus. As part of examination of the new course students are required to submit a design folder of computer drawing and freehand sketching. As a result, the school purchased laptops for all students taking the subject. The drawing room recently purchased a Visualiser or document camera. This allows both student and teacher demonstrations to be broadcast to the class using the data projector. This teaching aid has been a huge success with both students and teachers alike.