One also needs to be careful reading and interpreting data. According to the latest OBR Fiscal Sustainability Report (July 2020 - https://cdn.obr.uk/OBR_FSR_July_2020.pdf)
"Given that so few housing transactions took place during the lockdown, the ONS has paused production of the official house price index."...
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The latest OBR forecast is unchanged from March which shows steady house price growth, however they also put forward three scenarios for their report:
The upside scenario showing a short term decrease of about 2% in house prices, recovering to the March 2020 level by early 2021, and continuing to grow quickly.The central scenario showing a short term decrease of about 8%, with prices recovering to the March 2020 level by the start of 2022, and then growing steadily. The downside scenario showing a short term decrease of around 16%, with prices recovering to the March 2020 level by early 2023 and then growing steadily. n.b. the graph shows a house price fall from an index figure of 122 to 102. That is not a 20% fall.
So the OBR is not forecasting a 20% drop in house prices, but it is using a figure that comes moderately close to that as a worst case scenario. Even then, the drop is short term, so sit tight.
An estate agent friend of mine says that having done zero business for about 3 months this year, the market in the UK is now fizzing thanks to the Stamp Duty suspension and there is definitely no short term decrease at present. Of course, it will go flat once the duty is re-introduced.