| Week 1 |
Major Events |
- Big Brother 2005 launches with a live opening night that is broadcast around Australia. Fourteen official housemates enter the House, with another Logan twin entering the House.
- On Day 2, the Logans swapped places for the first time, during a special show named Live Surprise.
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| Group task |
- Getting to know each other: The housemates were asked questions about each other. They passed the task.
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| Friday Night Live |
- Glenn won the first Friday Night Live and took Logan with him to the Rewards Room. The theme for the night was Rome. Logan came runner up.
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| Nominations |
- Suitcases: One by one, each housemate went go to the Diary Room and nominate the person that he or she felt least deserved their suitcase. The housemates chose Constance, and therefore she returned her suitcase and it was not given to her for the rest of her stay in the Big Brother House.
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| Evictions |
- On Day 8, Big Brother told the housemates that they were constantly told during the pre-production process, that should their relationship status change during the auditions process, that they should tell Big Brother immediately. Because Constance, Dean, and Nelson did not do this, and lied to get into the House, they were all "evicted" to the Rewards Room.
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| Week 2 |
Major Events |
- The three housemates previously sent to the Rewards Room were allowed back into the House.
- Kate's birthday was on Day 10.
- On day 12, As part of Friday night live, Big brother reavealed the secret behind the checkered carpet on the wall, A bowling ally.
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| Group task |
- On Day 11, the housemates were told of their new task: to build the perfect housemate. They each had to have a part of their body moulded, they were then all put together to make a person. The housemates bet 100% of their budget on their task. They passed the task on Day 12.
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| Friday Night Live |
- Day 12 was Friday Night Live. Gianna won Friday Night Live, and took Christie to the Rewards Room. The theme for the night was 50's. Tim was the runner-up.
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| Nominations |
- Nominations took place on Day 9. The housemates in the eviction line-up are Geneva, Michelle, and Tim. After Glenn's Three Point Twist, the eviction line-up changes to Geneva, Tim, and Angela.
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| Evictions |
- Constance and Nelson were disqualified by public vote on Day 10 in a full-scale eviction. They were each told during their eviction interview that they would not receive any prizes.
- Angela was evicted on Day 15.
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| Week 3 |
Major events |
- On Day 15, Geneva left a shopping bag in the supermarket.
- Kate's birthday was on Day 10.
- On Day 18, housemates showed their disgust of Dean's reluctance to clean the House; he was appointed janitor by Gianna.
- Big Brother banned all housemates from using the spa until Dean cleaned the House. Big Brother then decided to limit the amount of alcohol to the houseguests.
- Christie got very drunk on Day 20, and was locked in the Airlock by Big Brother.
- Geneva made out with Glenn in the lounge room, the pool and the sauna.
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| Group task |
- A new task was announced on Day 17. A packing machine was set up in the garden, with conveyor belts. Housemates had to be on guard 24/7 because goods would be passed through the machine at any time. It was the housemates' job to pack all items into crates. On a majority vote, housemates wagered 75% of their budget. They failed and had only $48 to spend.
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| Friday Night Live |
- Day 20 was Friday Night Live. Michelle won Friday Night Live, and took Kate to the Rewards Room. The theme for the night was wacky athletics. Hotdogs was the runner-up.
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| Nominations |
- Geneva, Gianna and Hotdogs were nominated. Gianna used her Three Point Twist on herself, changing the eviction line-up to Gianna, Geneva, Hotdogs and Michael.
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| Evictions |
- Gianna was evicted on Day 22.
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| Week 4 |
Major events |
- Big Brother informed the housemates that because of the fines they had incurred during the previous week, their $48 shopping budget had been reduced by $50, $5 for each fine incurred. Because of this, the housemates owed Big Brother $2, and could only take staples from the shop. Dean was able to retrieve the bag left there the week before.
- Intruders Rachael and Vesna entered the House on Day 25 during Housemates: Incoming!.
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| Group task |
- On Day 23, the housemates were given a Tango task. They all had to learn how to tango, and could use a dance mat provided by Big Brother. They also had to learn using dummies. They wagered their full budget on the task.
- Kate was given an Insider mission on Day 24. She was told that she had to sabotage the Tango task by removing at least three heads from three dummies, and hide them without being found out. She was given five days to complete her mission, and was told that she might be tailed. Tim was later given the task of discovering that Kate was trying to sabotage the task.
- On Day 25, Kate managed to remove and hide some heads. The housemates suspected Tim of doing it.
- On Day 28, it was announced that the housemates had failed their Tango task, but because Kate accomplished hers, and Tim failed his, the group passed the task.
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| Friday Night Live |
- Rachael won Day 27's Friday Night Live, and took Tim to the Rewards Room. The theme was Italian.
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| Nominations |
- Housemates up for eviction were Dean, Michael, Christie, and Glenn. Michelle used her Three Point Twist on Glenn, but the line-up did not change.
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| Evictions |
- Michael was evicted on Day 29.
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| Week 5 |
Major events |
- Hotdogs received a video message.
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| Group task |
- On Day 31, the housemates were given a Housekeeping task. Housemates had to pair up as a chef and a waiter. The housemates wagered their full shopping budget again.
- Because housemates did not always wash their hands during the task, and one housemate picked their nose while making spaghetti, Big Brother announced on Day 32 that the housemates failed their task.
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| Friday Night Live |
- Glenn won Friday Night Live. He took Michelle to the rewards room. Christie was the runner-up. The theme was a day at the fair.
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| Nominations |
- Christie, Dean, Hotdogs and Michelle were originally up for eviction. Rachael used her Three Point Twist on Christie, changing the eviction line-up to Dean, Hotdogs and Michelle.
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| Evictions |
- Michelle was evicted on Day 36.
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| Week 6 |
Major events |
- Day 38's dinner was confiscated after Dean broke the rules.
- The housemates found out that they passed their task on Day 40. Big Brother threw a party in celebration of their passing the task, that went into Day 41. There was a lot of alcohol, and Hotdogs got considerably drunk. He refused to clean up, and upset Geneva, Vesna, and Glenn. On Day 42, he apologised for his behaviour. He received a strike from Big Brother on Day 43.
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| Group task |
- The housemates were given a Calendar Task on Day 37. When the housemates heard a camera shutter, they had to strike a pose and hold it, as though for a calendar. They wagered their full shopping budget.
- Because housemates did not always wash their hands during the task, and one housemate picked their nose while making spaghetti, Big Brother announced on Day 32 that the housemates failed their task.
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| Friday Night Live |
- Dean won Friday Night Live. The theme was water sports. Racheal was the runner-up. He took Hotdogs to the rewards room.
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| Nominations |
- Christie, Dean, Geneva and Rachael were up for eviction. Glenn used his Three Point Twist on Dean, changing the eviction line-up to Christie, Geneva and Rachael.
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| Evictions |
- Rachael was evicted on Day 43.
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| Week 7 |
Major events |
- Day 38's dinner was confiscated after Dean broke the rules.
- The housemates found out that they passed their task on Day 40. Big Brother threw a party in celebration of their passing the task, that went into Day 41. There was a lot of alcohol, and Hotdogs got considerably drunk. He refused to clean up, and upset Geneva, Vesna, and Glenn. On Day 42, he apologised for his behaviour. He received a strike from Big Brother on Day 43.
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| Group task |
- On Day 44, Big Brother introduced the Masters and Slaves task, where half of the housemates are allocated slaves to one other housemate each. The masters were not allowed to say please, thank you or sorry to any of the slaves. They had hot water available to them whenever they wanted, but slaves had to shower outside and do laundry.
- The Masters were given new slaves on Day 46. Dave became Greg's slave.
- On Day 47, the Masters became slaves, and the new Masters got to choose whomever they wanted as their slave.
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| Friday Night Live |
- Kate won Friday Night Live. Tim was the runner-up. The theme was Boot camp. Kate took Geneva with her to the rewards room.
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| Nominations |
- Housemates up for eviction were Geneva, Hotdogs, and Vesna. Dean used his Three Point Twist on Geneva, and added himself to the line-up.
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| Evictions |
- Geneva was evicted on Day 50. The girls expressed disappointment in the fact that Dean did not get evicted.
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