The House system is an important part of life at King Edward's. Upon entry, each pupil is assigned a House and will remain with it for the duration of their time at the School. Each house has a Housemaster or Housemistress and two Heads of House, one male and one female Sixth Form pupil, appointed annually by the Head Master.
There are six houses, named after people closely associated with the history of the School. The first is named after the Rector of St Mary's and founder of King Edward's, William Capon.The remaining five take their names from prominent Old Edwardians: Thomas Lake, a favourite of Queen Elizabeth I and one-time resident of the Tower of London; Thomas Lawrence,the friend and personal physician of Dr. Johnson; Edward Reynolds,Chaplain to King Charles I and later Bishop of Norwich; Joshua Sylvester, a poet of questionable merit but considerable business acumen and Isaac Watts, a pastor and author of hymns including the School's own, 'O God, our help in ages past'.
The six Houses compete annually for the Allen Grant Trophy, which is awarded to the House that has scored the most points during the year in a series of academic, sporting and cultural competitions.