Report Halifax House Price Index July 2020 in House prices and the economy Posted August 7, 2020 Could it be that something else is at play here. The stamp duty holiday delivers more benefit to a 500k house (15k) than to a 250k house (5k). This has led to more high value houses being sold than lower ones. In this scenario the average house price will rise even if actual individual prices stayed the same. Your thoughts?