The HomeOwners’ Alliance says vendors must put their homes on the market no later than Tuesday if they are serious about selling by Christmas.
Using its comparison site, the HOA says homes listed for sale for the first time during autumn are typically slower to sell than those first put on the market in spring.
Homes listed in October have taken an average of 65 days to sell over the past two years, it says, meaning that vendors who want a sale agreed this side of Christmas should be looking to list their house for sale by Tuesday, October 17.
On average over the past two years, properties in the UK have stayed on the market for anywhere between 51 and 70 days.
The data shows that - despite a string of uncertainties such as the EU Referendum, the 2017 General Election and subsequent triggering of Article 50 - the average length of time to sell a property has remained relatively constant.
The one factor which did provoke an increase in speed was the introduction of new stamp duty surcharges in April 2016, which prompted a flurry of fast deals in the months beforehand.
The new year remains the best time to list your property for a speedy sale, with homes listed in January selling the fastest and the speed of sale slowly increasing in the months thereafter according to the HOA.