Legislation in support of the National Broadband Network (NBN) may need support from an unpredictable minor party senator when it possibly reaches the Senate before the last week of October.

According to the Senate Bills List, legislation that requires property developers to lay fibre in new estates had already lapsed. The legislation would have to be reintroduced into the House of Representatives, which has a majority made up of independents and minor parties.

This week, important telecommunications legislation amendment bills and the fibre bill were omitted from the Senate and House legislation lists. A spokesman for Broadband Minister Stephen Conroy said that the fibre bill may be reintroduced next month or in November because the Senate's first weeks were allotted for the reintroduction of legislation that does not need amendments.

One of the proposed bills aims for the structural separation of Telstra and gives more powers to the competition watchdog. Passing the laws would allow both Telstra and NBN Co to release more details to investors regarding the $9 billion deal.

The bills will likely be voted on by October 26. This is because the Senate has only one sitting week scheduled for this month while supplementary budget estimates will be tackled next month.

The project would need the support of Senator Steve Fielding to get through. Fielding is undecided on the Competition and Consumer Safeguards Bill. The senator, according to a spokesperson, is said to have had "worthwhile" discussions with representatives from Telstra and is expected to meet with the government official in the near future.