More first-time buyers climbed on to the property ladder in 2016 than in any year since 2007, but would-be home owners now need to raise more than £32,000 for a deposit, research suggests.
Those buying their first property can expect to pay more than £200,000 across the UK generally and an "eye-watering" £400,000 in London, according to Halifax.
Deposit sizes have more than doubled over the last decade. In 2006, the average first-time buyer deposit across the UK was £15,168. Now it is £32,321 - around 16% of the price of a typical first home.
In London, a first-time buyer's deposit is more than £100,000 on average, assuming they can also cover moving costs and stamp duty.
First-time buyers in London put down a 25% deposit on average in 2016, amounting to £100,445.
In 2016, the average house price paid by first-time buyers was £205,170 - the highest on record. This average has grown by 7% over the last year, pushing it over the £200,000 mark.
In London, first-time buyers can expect to pay £402,692.
The number of first-time buyers is estimated to have reached 335,750 in 2016, Halifax said. This is the highest figure since 359,900 in 2007, and marks the third year in a row that the number has topped 300,000.
Halifax said the number of first-time buyers in 2016 was 75% higher than a low point in 2009, but 17% below a pre-crisis peak of 402,800 in 2006.
As the cost of housing has increased, first-time buyers have been taking out longer mortgages. In 2006, just over a third (36%) had mortgages lasting beyond the traditional 25-year period. In 2016, 60% of mortgages were for 25 years or more.
More aspiring first-time buyers are also having to factor stamp duty into their costs. Less than a third (29%) of first-time purchases in 2016 were below the £125,000 stamp duty threshold. This share was 45% in 2013.
The average age of a first-time buyer is 30, ranging from 27 in Carlisle in Cumbria and Torfaen in South Wales to 34 in places such as Slough in Berkshire and the London boroughs of Barnet and Ealing.
Martin Ellis, a housing economist at Halifax, said record low mortgage rates, high employment levels and Government schemes such as Help to Buy have helped first-time buyers. The UK-wide Help to Buy mortgage guarantee scheme ended in 2016, but other schemes are still available.
He said: "Across the regions there is a contrasting picture. In London - which has one of the youngest populations in the UK - the average house price for a typical first-time buyer is now more than an eye-watering £400,000 with an average deposit of over £100,000 - more than twice that in the South East, the next most expensive region."
Halifax used a range of sources for the research, including its own housing statistics database and figures from the Council of Mortgage Lenders (CML) and the Office for National Statistics (ONS).