Not only that the national broadband network (NBN) roll out is suffering from delays and budget blow out, many Australians may also end up not having access to fixed line communication facilities, the Coalition said on Thursday.

What has been unfolding is a crisis that according to Shadow Communication Minister Malcolm Turnbull could potentially affect thousands of Aussie households, especially those who are set to reside on soon-to-be constructed housing estates.

"It is simply not a matter of them not having access to optical fibre, they have no fixed line whatsoever," Mr Turnbull was reported by the Australian Associated Press (AAP) as saying yesterday.

He blamed the lack of coordination between property developers and builders contracted by NBN for the increasing backlog, which to date numbers at around 74,000 households that mostly were from housing projects being constructed.

Much of the oversights also rest on Communication Minister Stephen Conroy, who is the chief federal official overseeing the $36 billion NBN project, Mr Turnbull said.

In a statement, NBN Co has admitted that the problem cited by the Coalition was indeed a looming reality and at present reflects one of the biggest challenges being encountered by the underway nationwide NBN build up.

However, the company clarified too that the matter is being dealt with in order to avoid the scenario that Mr Turnbull feared would add up to the construction woes of the government's national broadband initiative.

"We're also making great strides to get on top of it ... We hired additional construction firms to get the job done," an NBN Co spokesman was quoted by AAP as saying in a statement issued on Friday.

NBN Co also welcomed suggestions by Mr Turnbull that private firms should be allowed to actively participate in the federal broadband project by giving them the space to compete with NBN Co, which the federal government has created to act as chief entity to implement the NBN roll out.

Private sectors, Mr Turnbull said, could be tasked to construct fixed line infrastructures that would serve the wired communication needs of Australians across the nation.

Such set up is actually already in place, NBN Co said, in which property developers were given the option of picking a private company as telecommunication providers for their housing projects.

In the same case, NBN Co will only step in if a private player will not be able to work with developers, the company said.