After the second series concluded, it was announced that the house would be moved to Elstree Studios, Borehamwood, Hertfordshire after Newham London Borough Council ordered the complex to be returned to a natural habitat after planning permissions expired in 2002 for previous house. This series was the first civilian series to begin live. In previous series, the housemates would move in and would air later.
Reverse Eviction: The housemates and the public switched roles for the first eviction. The public had to vote on who to nominate, and the housemates then had to vote on who of the two housemates who received the majority of the public vote to evict.
Rich vs. Poor: From Week 3 to Week 6, the house was split up into a rich side and a poor side, with the rich side receiving luxurious amenities and privileges and the poor side receiving basic rations and uncomfortable furniture. Housemates would participate in live tasks to determine who would live on which side of the house for the week.
The housemates were told to each paint one of the dining room chairs however they wanted.
The housemates had to take a general knowledge quiz to win their shopping budget for the week. To succeed, they were required to answer seven out of ten questions correctly.
The housemates had to take turns in trying to shoot a basketball through a hoop. The first five housemates to score would live on the rich side.
Living on the Rich Side
Jonny, Kate, Lee, Sophie, Sandy
The housemates had to take turns throwing darts at a dartboard. The housemate with the best score at the end of the task would choose three housemates to join them on the Rich side of the House.
Alex, Adele, Jade, Sophie
The housemates played a game of musical chairs in the Rich bedroom, with one housemate being eliminated each round. The last housemate remaining would select three housemates to join them on the Rich side of the house.
Alex, Adele, Jade, PJ
The housemates were given a new task in which they must learn two dances by the following night.
The housemates were given a "Memory Quiz" where they were each asked questions about the House in the Diary Room. They were told that if they all got their questions right, the divide would be taken down.
Living on the Rich Side
Taking the Divide Down
Kate entered the Diary Room and was told that if she could name all of the housemates in alphabetical order then the divide would be taken down; failure would result in Kate being moved to the Poor side as well.
The housemates were given a task of making sock puppets to represent the fourteen housemates that have appeared on Big Brother 3.
The housemates were given a new task, known was "Master and Slave," in which one housemate would be the master and the other would be the slave; the following day, the roles were reversed. Masters could demand slaves to do anything for them, with the slaves having to comply. Following this task, the housemates had to select the one housemate who they felt best played the role of the slave.
30 Minutes of Music
The housemates were given a quiz about one another as part of their weekly task. Each housemate was separately called to the Diary Room to answer three questions about their fellow housemates. All of the questions were based on answers given in their application form. For each correct answer, the housemates earned £25 for their shopping budget and five seconds added on to a phone call with a loved one, which one housemate would receive.
The housemates took part in a task in which had a roller disco theme. The second bedroom had been converted into a roller disco, and housemates had three minutes to put on their roller blades and pads and get on the floor each time a buzzer sounded. If a housemate failed to achieve this, it would count as a "no-show," and three strikes would mean that the housemates had failed the task.
70's Themed Party
The first part of the task was an obstacle course which they had to complete blindfolded. For the second part of the task, the housemates had to bet a proportion of the their money, on an egg and spoon race, and would bid on one of their former fellow housemates to win the race. They were shown a video of Spencer, PJ, Lee and Sophie racing, and had to bet on which of these housemates they felt would win; they chose to bet on Sophie.