The number of exchanges was 14.2% down last month compared with September last year, and 0.6% down on August.
In London, transactions measured at exchange were 1.5% down on the month.
The figures are from haart’s own data compiled across some 100 branches in England and Wales.
The agent puts the average house price in England and Wales at £227,336.
It also says that buyer demand is down 6.7% annually and that the number of properties coming on to the market has fallen 14% year on year, and by 2.2% on a monthly basis.