Gretel explained the changes made to the Big Brother house. The house is environmentally friendly, with modifications including:
- water dispensers that draw condensation from fresh air;
- recycled Australian-made fabrics used to make the diary room chair;
- showers heated by power from solar panels;
- outside furniture made from 50,000 recycled plastic Pepsi lids;
- non-allergenic 80 per cent goat-haired carpets; and
- filtered rainwater stored in water tanks in the back yard of the house.