The New South Wales Government has been accused of being heartless and forcing people to sell their homes to the Government unnecessarily.

Key points: More than 400 compulsory acquisitions underway

More than 400 compulsory acquisitions underway Bringelly couple have 90 days to leave home

Bringelly couple have 90 days to leave home Lawyer says limited community consultation

There are more than 400 compulsory acquisitions underway across Sydney making way for new infrastructure projects.

The State Opposition said the process was flawed and the Government was being heartless.

"We are seeing time and time again people who are being put under enormous stress from a system that just isn't working," Opposition spokeswoman Jodi McKay said.

Jenine and Tony Carioti have 90 days before they will be forced out of their home at Bringelly in Western Sydney.

Situated on The Northern Road their five acre property sits in the middle of the new Northern Road/Bringelly road interchange.

The proposed road is being constructed to allow for the estimated traffic increase to the nearby Badgerys Creek airport.

'That's dictatorship, that's not Australian'

Mrs Carioti said they found out about the compulsory acquisition of their property from a pamphlet that was left in their mail box.

"If we don't leave they will have us evicted by the sheriff and that's so wrong, that's dictatorship, that's not Australian, there is nothing fair or honest about that," she said.

Under the compulsory acquisition process there are numerous different types of compensation offered to homeowners including market value of their property.

There is also a disturbance claim which includes things like removal costs, stamp duty on a new property, legal and valuation costs.

Jonathan Wertheim said legally the Government did not have to have an EIS. ( ABC News: Brigid Glanville )

But Mrs Carioti said their initial offer was well below market value and they have now engaged law firm Slater and Gordon to negotiate a better deal, but she said the stress and anxiety was relentless.

"The other day... I just hit the floor, I didn't want to go out, I turned the phone off as I just wanted to be alone and I spent the morning going around my house taking photos of my home and that's not normal," she said.

Slater and Gordon compulsory acquisition lawyer Jonathan Wertheim said there had been limited community consultation and the Government had not conducted and Environmental Impact Statement (EIS).

He said legally the Government did not have to have an EIS.

"What we're finding is those initial offers are significantly below what an independent valuation of the market value would be," Mr Wetheim said.

"There seems to be a bit of a short cut they can take in terms of the planning approval, it's not a requirement in this instance to have an environmental impact statement, instead there is a shorter approach which is just a review of environmental factors."

That review is not subject to the same scrutiny that an Environmental Impact Statement is.

Premier Mike Baird conceded the compulsory acquisition process was difficult for families, but said it was necessary.

"There are challenges and with that comes acquisitions, we will do that as compassionately and caringly as we can but obviously when we're undertaking the sort of growth that the airport will bring to the west we need to make sure roads are right and that upgrade is essential," he said.

The State Government has undertaken a review of the compulsory acquisition system but has not released the report, which was commissioned in May 2012 by then finance minister Greg Pearce.

The State Opposition said it had tried to access the review through Freedom of Information but they were not able to access it.