The data looked at the average asking price for two-bedroom flats and three-bedroom houses across regions.
The average asking price for a two-bedroom flat in Yorkshire rose 10% to £153,354 in the week beginning 28 September from £139,404 in the week starting 18 May.
Asking prices for two-bedroom flats in London fell by 4% over the same period.
For three-bedroom houses, Yorkshire also experienced the biggest rise over the same period, increasing 8.4% to £186,045.
Emma Hodgson, head of sales at Knight Frank’s Harrogate office, said: “The market has been so buoyant due to a huge influx of demand from the south of the country.
“Whereas the South West of the country has a pull as a tourist destination, many buyers are coming to Yorkshire due to family connections.”
Half of all buyers Hodgson is dealing with are reportedly from the South compared to less than a third this time last year.
The appeal of Yorkshire will also have been boosted by its relative value versus other parts of the country, with an average price of £171,325 in July compared to £325,734 in the South East and £263,353 in the South West.
