It would be the Field Books that would give you the date when a property was valued!!
Field Books recorded information about the size and quality of the soil of an individual holding. If you're lucky, you may also find head of household names recorded, too. These books were used to gather details between 1830 and the early 1860s, the exact information gathered changing with each piece of legislation during these years, and they do not all survive. The NAI holds books for the Republic and some of the books for Northern Ireland. PRONI holds most of the books for Northern Ireland counties.
The NAI collection has been digitised and is expected to be added to the NAI's Genealogy website sometime
House books were compiled between 1830 to around 1844 and often record the occupier's name. They also record details of living conditions, not just in terms of space but also the materials used for walls and roofs, and of outbuildings. Some even include sketches of the property, barns and outbuildings. These Valuation Books are, therefore, the most interesting for family historians. The NAI holds books for the Republic and some of the books for Northern Ireland. PRONI holds most of the books for Northern Ireland counties.
The NAI's collection has been digitised and is expected to be added to its Genealogy website sometime!
http://www.irish-genealogy-toolkit.com/valuation-books.html