The school has thirteen dormitories, four of which were built in 2017, and accommodate almost 1,800 students. The houses are, in order of age, and with the reason for the name:
- Livingstone House: Scottish explorer Dr. David Livingstone
- Aggrey House: Dr Aggrey of Achimota
- Wilberforce House: Scottish abolitionist Sir William Wilberforce
- Grieve House: first principal of the school George Arthur Grieve
- Arthur House: Scottish medical missionary John Arthur
- Francis House: school’s second principal Edward Carey Francis
- Smith House: longest serving member of the teaching staff James Stephen Smith
- Sellwood House: Major Sellwood.
- Campbell House: school’s third principal, L. J. Campbell
- Sanders House: the school’s fourth principal, A. C. E. Sanders
- Githaiga House: the school’s fifth principal, J. Githaiga
- Wangai House: the school’s sixth principal, E. Wangai
- Maneno House: the school’s seventh principal, S. S. Maneno
Many activities within the school are based on the house system. This includes the arrangement at the parade ground where assemblies are conducted every morning and role call parades are conducted. Inter house competitions include music and elocution, drama, math contest, Swahili contest, essay writing contest, battle of the blocks writing challenge, cleanliness competitions, and sports such as soccer, rugby, racquet games, swimming, etc.
At the end of every term, during the school dinner, awarding sessions are held where the winning house in every category receives a carton of biscuits. The First and second runners up receive half and quarter a carton respectively. The winning house in standards and athletics, K.C.S.E. and cross country is awarded a bull which is slaughtered and offered for a party.
The houses have a committee of form 3 students who run the house’s day-to-day activities. The committee is usually chosen by the house prefects and the housemaster. It is composed mainly of the chairman, vice chairman, secretary, organizing secretary, activities coordinator and resource manager and two members of the house’s choice. However, houses may have additional positions which vary depending on their need. In most cases, these committee members end up as house prefects. However, this trend is changing to incorporate students with impeccable leadership qualities who did not make it to the house committees into the prefecture body.
Students in these houses are housed in hostels. The hostels are structured into cubicles where four students share one cubicle. The hostels have washroom facilities with hot showers, laundry areas, ironing bays, a common room and open lawns. Due to the current high population old houses have been renovated to house the rapidly growing population.