A man who was told the new National Children's Hospital would be a 'light at the end of the tunnel' for his daughter said people are 'tired and fed up' waiting.
The hospital is being further delayed with construction now set to be complete by next spring at the earliest.
The Public Accounts Committee (PAC) heard earlier that staffing plans for the hospital can only start after the building is ready.
It is thought the hospital's opening could be further delayed as the work needed to get the specialised workforce in place could take much longer.
Bernard Mulvaney's daughter Sophia, who is now 14, attends clinics at Temple Street Children's Hospital.
On Lunchtime Live, he said they were told things would be different when Sophia was born.
"I'm standing just outside Temple Street Children's Hospital waiting on a clinic," he said.
"I'm looking up at a window of a room where I slept on the floor for months at a time over the last 14 years - Temple Street would be a big part of our lives.
"I remember when Sophia was born we were told 'It's going to be hard for the next few years but there's light at the end of the tunnel because within five or six years we've going to have this new Children's Hospital'.
"That was 14 years ago".
'Horrendous conditions'
Mr Mulvaney said the Temple Street building reminds him of a "Duplo kids building with bits tacked on and attached here, there and everywhere".
"The staff are inside, they're working so hard, they're trying their very best.
"You've families in there just in the most horrendous of conditions due to the fact that they've got very unwell children".
Construction underway on the site of the new National Children's Hospital in Dublin. Image: BAM IrelandMr Mulvaney said people are 'fed up and upset' waiting for the new National Children's Hospital.
"This hospital is supposed to be this lifeline us - for our families, for our children - and once again delay after delay," he said.
"At this stage people are just so tired and fed up and upset.
"There just seems to be no accountability, it just seems to stretch out longer and longer.
"The only ones who seem to be benefitting are those who are building this - yet families are here sleeping on chairs".
'Voices of parents'
Mr Mulvaney said those directly affected by the delays are not being heard.
"There seems to be no voices of parents included in this horrendously stressful situation," he said.
"What's enough? I don't know.
"We've got children with the most complex needs who are in here for extended periods of time, some of them are here for up to a year.
"The pressure, the stress that's put on families is just huge and this hospital is supposed to take that all away".
Mr Mulvaney added that he doubts the hospital will open to its new deadline.
Last February the Government gave the green light for a budget of €2.24bn for the hospital, with then Taoiseach Leo Varadkar saying it would open in 2024.
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