I think it is down to bed spaces. So a 2bed house would usually fit 4 single beds.
Just found this on RTB site: notice to end tenancy:
RTB operates Ireland's National Tenancy Register and resolving disputes between Landlords, tenants and third parties. Governed by residential Tenancies Act 2004. View more information on landlords and tenancies.
www.rtb.ie
'2. The property is not suited to the tenant’s needs
The property no longer suits the needs of the tenant, for example, it may be too small. In this case, a statement as to why it is no longer suitable for the needs of the tenant must also be given with the notice of termination. The statement must also specify the bed spaces in the dwelling.'
If you think of it you filled in a form for HAP and it asked for the number of bed spaces. Council also stipulates that at certain ages the child who is now a adult should have its own room.
The electronic Irish Statute Book (eISB) comprises the Acts of the Oireachtas (Parliament), Statutory Instruments, Legislation Directory, Constitution and a limited number of pre-1922 Acts.
www.irishstatutebook.ie
Found this on the Housing Act 1966
PART IV
Overcrowded and Unfit Houses | | |
| Definition of “overcrowding”. |
63.—A house shall for the purposes of this Act be deemed to be overcrowded at any time when the number of persons ordinarily sleeping in the house and the number of rooms therein either— |
| (a) are such that any two of those persons, being persons of ten years of age or more of opposite sexes and not being persons living together as husband and wife, must sleep in the same room, or | |
| (b) are such that the free air space in any room used as a sleeping apartment, for any person is less than four hundred cubic feet (the height of the room, if it exceeds eight feet, being taken to be eight feet, for the purpose of calculating free air space), | |
| and “overcrowding” shall be construed accordingly. | |