Marlborough House is predominantly a day school, but operates a flexi-boarding policy for pupils over the age of eight.

The school's sporting and cocurricular facilities include a full size sports hall, a swimming pool, an astroturf, tennis courts, an outdoor classroom, Forest School areas, a shooting range, an observatory and a pitch and putt golf course.

Prior to becoming Headmaster of Marlborough House School, Mr Newton was Chief Executive of The Cothill Trust and held the position of Chairman of the Independent Association of Prep Schools.

In 1874, Mrs Sophia Lombe White opened a small boarding school for boys aged 8–13 on the Sussex Coast in a building named Marlborough House.

The core of the school remains the ‘main building’ – an 18th century country house.