The local authorities produce two separate lists:
- those in unsuitable housing/homeless and on the housing list waiting for housing
- those looking for a transfer
The latter includes several different scenarios
- Medical welfare cases - typically people with illness or disabilities who need a [different] adapted property to suit their needs
- existing council tenants seeking a change to a bigger property due to family size increasing
- council tenants looking to move for reasons other than family size
- HAP or AHB tenants who want to move to a council rental
AFAIK from time to time efforts are made to "clean" the data so they don't include people who have died, left the country, gone to prison, won the lottery, changed family circumstances, whatever reason that would mean they no longer qualify. Another issue is people moving from one area to another with genuine reason (eg HAP tenant having to move area after an eviction to sell). But there is probably usually some people on the list who qualify on account of personal circumstances but would not have an urgent housing need (aka the HAP tenants in a stable tenancy looking to move or an applicant in their 20s with no dependents who is not currently homeless).
There is no separate applicant list for AHBs. Access to social homes via AHBs is usually via the council's list in which case they are nominated to the AHB for interview and placement.
This is the current Dublin city council policy
Overall estimates of general housing needs is not scientific. The current media/political narrative is that any adult over 21 living in the family home is there unwillingly due to the housing crisis and not other factors such as education status, personal preference, relationship breakups, illness, unemployment, low income, caring duties or just personal preference. I know at least one single guy in his 40s who lives in his parents attic because he really wants to inherit the family home (they've enough wealth to pass on the equivalent to all other siblings in that case) & by keeping it as his sole residence he won't have to pay inheritance tax (the value of the property would be well over the threshold). The current use of data by the media just assumes that every adult in their 20s and 30s who lives at home does so because rents and house prices are high, and not the other reasons stated above. I'm old enough to remember that in my mid 20s it was considered rather odd, and even a bit anti-social to move into a flat in Dublin if your parents were still alive and in the family home. People used to say that such young people should be helping out the family through giving up part of their incomes rather than paying rent to strangers.
Migrants who move here to work or study, or study and then work, normally would not be found on such lists because of the ordinary residency requirements. If they stay here long enough and become citizens certainly they will start to show up on housing lists, as will former asylum seekers granted leave to remain (in practice most of these will end up on HAP for a very long time). If they do qualify they will be treated the same as anybody else on the housing list in accordance with
Housing circular 41/2012. They would not get any priority and would join the very long queue.
The recent ESRI study was wildly different to the census in terms of the percentage living at home in their 20s because it is based solely on "growing up in Ireland" research subjects who were born in the country in 1998 and specifically excludes anybody who moved here after that. That's why is showed a far higher number living in the family home - by their nature, migrants in their 20s overwhelmingly arrive here of their own accord and few would be living with older family members unless they too have migrated to here.