The average deposit for a first-time home in the UK last year was £51,500, according to the Office of National Statistics (ONS). This varied, of course, from £21,571 in Blackpool to £132,000 in London. On average, first-time buyers were able to set aside 24% of the value of their property before buying and the good news is, it's working: in 2017 more mortgages to first-time buyers were granted than in any other year since 2006.