A parish school was first established in the village of Lasswade in 1615, run by the schoolmaster, Andrew Watson, from a cottage at the mouth of the Spout Burn.

One of the most notable schoolmasters during this period was the poet and scholar William Tennant, who was appointed in 1816 and subsequently became Professor of Oriental Languages at the University of St Andrews.

In 1843 a two-room schoolhouse was opened, which the New Statistical Account of Scotland described as "a spacious and elegant building" where Latin, Greek, French and mathematics were taught (albeit at a fee that was "very considerable in amount").

[1] In 1956, Lasswade Senior Secondary School (as it was now known) transferred to yet another new building, this time located in the nearby town of Bonnyrigg, with improvements and extensions opened in 1978 to provide classrooms for the Business Studies, Home Economics, Music, Art & Design, Science and Craft, Design & Technology departments, as well as a Library, Computer Room, Kitchen, Dining Room and Sports Centre.

[1] The facility also has a purpose-built Sports Centre, which comprises a games hall, squash courts, fitness training rooms, activity movement studio, cafeteria, creche and spacious playing fields.