Ok, in light of jxbr's helpful comments on what figures I should and shouldn't include, I'm updating the calculation.
You can start to surmise property sales volume based on the IBF figures for mortgages drawdowns
(Note 1: I exclude Top-ups, as IBF defines it as "a further mortgage advance to an
existing borrower which is issued to finance expenditure other
than house purchase."
Note 2: I've included 50% of each quarter's Re-Mortgages figure, as IBF defines it as "a loan which is issued by one lender to refinance an existing mortgage with another lender. This may or may not
include further equity release.")
Q1, 2011 2,454
Q2, 2011 2,863
Q3, 2011 3,055
Q4, 2011 3,326
Q1, 2012 2,274
Therefore, average monthly sales volume from Q1 2011 to Q1 2012 is 931 (13,972/15)
IBF states "We estimate that the data covers well in excess of 95% of the mortgage market."
So let's add 5%, making it 978.
Now the CSO's coverage of stamp duty returns in 2009 (laughably the latest figures at hand) showed cash sales of 6%. Numerous estate agents (with vested interests) have been saying cash sales are now 25-40% of all sales.
So let's say the 978 mortgage drawdowns per month on average from Q1 2011 to Q1 2012 represents 70% of all property sales in the period.
We can add 30% for cash sales, making total monthly property sales 1,271.
Ok, a few assumptions gone in, but interesting to see there currently may be as little as 1,271 transactions per month nationally.
And this is between all 8 types the CSO is tracking:
1. National - all residential properties;
2. National - houses;
3. National - apartments;
4. National excluding Dublin - all residential properties;
5. National excluding Dublin - houses;
6. Dublin - all residential properties;
7. Dublin - houses;
8. Dublin - apartments
Now, the 2010 Stamp Duty figures were presented lately in the Dáil http://debates.oireachtas.ie/dail/2011/12/13/00049.asp
(Sorry for comparing 2011 mortgage drawdowns with 2010 SD returns. Just can't get the 2011 SD returns yet!)
It shows 43% of the receipts were for Dublin.
So using this, of the Q1 2011 to Q1 2012 average showing 1,271 property transactions per month in Ireland,
547 were in Dublin,
724 were in Rest of Ireland.
I’ve checked accuracy of my estimates above versus the official PPR figures.
All 1,271. Per PPR 1,476 (22,141/15). [So out by = -14%]
of which Dublin 547. Per PPR 474 (7,107/15) [So out by = +15%]
of Rest of Ireland 724. Per PPR 1,002 (15,034/15) [So out by = -28%]
Interesting to see that Dublin in 2010 represented 43% of Stamp Duty returns by Value but 33% by Volume.