The show launched on 22 September 2008 and continued for 3 months (12 weeks), ended on 14 December 2008, lasted for total of 84 days which is the shortest regular Big Brother season so far in Bulgaria.

The prize was 300,000 leva, which was the highest in the history of Big Brother Bulgaria.

Former VIP Brother 2 housemate Veneta Raykova was the host of a new late-night talk-show called Little Sister.

Rumen Lukanov was the host of the interactive part of the show.

Replay episodes aired on Nova Television were broadcast at 18:00 the next day.

The talk show Little Sister was aired on Monday and Thursday at 23:45.

From 22 June 2008 until 22 July 2008, auditions were held in the ten biggest cities in Bulgaria – Pleven, Veliko Tarnovo, Rousse, Shumen, Varna, Bourgas, Stara Zagora, Plovdiv, Blagoevgrad and Sofia.

The third and final round of the auditions was held in Sofia from 20 July 208 to 10 August 2008, with 415 candidates.

On 15 September 2008, ten of the selected housemates were isolated in separate secret places.

Originally, an eleventh housemate – Neli was expected to enter the house.

Denislav was chosen by the viewers, and Ventsislav – by the female housemates in the house.

His girlfriend is the Bulgarian pop-folk singer Sonya Nemska, who was in the house for a few minutes during one of the housemates' week task.

Filip Ralev from Sozopol entered the show on Day 4, posing as the mentally disabled man Toshko from Grudovo.

When he entered the studio, the viewers and audience were not told about this, and they only learned the truth about Toshko when Big Brother called him in the Diary Room to confirm his secret mission: to fool all housemates into thinking he really has mental disabilities.

She was the first blind housemate in the history of Big Brother Bulgaria.

The producers and the medical team decided that it was better not to take part in the show, and became a reserve.

The two or more housemates with the most nomination points face the public vote to evict.

However, the start of a new season has been delayed due to the competition for the building company.

Big Brother 4 was recorded in a new house near Sofia in the village of Novi Khan, as the old one has been destroyed.