Shane its just that my Grandparents house was a 2up 2down house and they were the only family living in it and it was still classed as a tenement and the same with a couple of the neighbouring houses.
I am not sure why the entire street is classified as 'Tenement' - in the earlier Thom's. As you've mentioned there are single family occupied houses on the street, which I would have thought would not generally be classified as Tenements..
i.e. some of the houses seem to be bungalows, or 2 up 2 down (the ones with two windows, or 5 windows in the front), others have a single family. I would usually think of a tenement as larger building subdivided for multiple families - like 2, 4, 7, 10, 11 etc
I double checked the Thom's listings and for 1904 the street is listed as follows
Fitzwilliam Lane -
from Fitzwilliam St Lwr to Merrion St. Upr 1 Tenements - 10
l (shillings rateable valuation)
2 to 11 Tenements - 7 to 14
lThe listing in 1914 shows a change in the details, and possibly some new buildings :
1a Edwd Brien / Patk. Brien - Cab & Car owner
1 to 11 Tenements
6 J. Cunningham, cab & car proprieter
15 Daniel Doyle, car owner
It looks like some additional development was carried out between 1904 and 1911, as the census shows numbers up to 16, rather than the 11 listed in 1904
Shane