London’s £100,000 Homebuyer Income Estimate Assumes a £150,000 Deposit

London buyers need around £100,000 in annual income to purchase the capital’s average home, according to new e.surv analysis. But there is a substantial cash requirement behind that headline: the calculation assumes a deposit of almost £150,000.

The surveyor’s November House Price Index puts the average London property at £598,700, down 1.3% over the year. Its affordability model uses a 25% deposit and mortgage borrowing of 4.5 times income.

That distinction changes the story for professional couples and first-time buyers. Reaching a six-figure household income may still leave a considerable funding gap if their savings cover only 10% of the price.

Willow’s recent coverage of the 142% rise in first-time buyer mortgages at 5.5 times income or more examined the growth in larger loans. The London figures show where that extra capacity could become relevant: buyers with strong earnings who cannot bring a quarter of the purchase price in cash.

The £100,000 figure describes a particular purchase

The assumptions appear in e.surv’s original report. They provide a consistent way to compare regions, but they are not a universal minimum income for buying in London.

A buyer choosing a cheaper property needs less borrowing. Someone bringing more equity from a previous home may also need less income to support the required loan. Conversely, a smaller deposit increases the mortgage needed for exactly the same property.

The deposit itself is only part of the cash budget. Purchase taxes, legal work, survey costs and moving expenses need to be allowed for separately. Having £150,000 in savings does not necessarily mean all of it is available to put towards the price.

That is why the headline is most useful when translated into the buyer’s actual position. It describes a combination of earnings and capital, rather than a salary level that automatically makes an average London home affordable.

A smaller deposit moves the income hurdle

Keeping the £598,700 property price and 4.5-times-income assumption unchanged shows how much the deposit matters. Reducing the deposit from 25% to 10% adds £89,805 to the mortgage requirement.

A household earning £100,000 with a £59,870 deposit would have an illustrative purchase budget of £509,870 at 4.5 times income. Against the average London price, that leaves £88,830 unfunded.

For that household, a small reduction in the asking price would help, but would not close the whole gap. The choices involve a larger deposit, a less expensive home or a mortgage assessment that supports more borrowing.

Where higher income multiples could change the outcome

The same £100,000 household would need to borrow approximately 5.39 times income to fund the £538,830 mortgage required with a 10% deposit.

That sits below 5.5 times income, making higher-LTI lending potentially relevant. However, the buyer also needs a lender prepared to offer the required borrowing at 90% loan-to-value. Both conditions have to fit the same application.

The recent Stonebridge figures record 7,621 first-time buyer completions at 5.5 times income or more in the year to June 2026. They demonstrate that borrowing at those levels is happening, without establishing that every £100,000 household can obtain it.

Four-and-a-half times income is the benchmark used in this analysis, not an absolute ceiling applying to every mortgage. For an eligible buyer, access to a higher multiple could close a specific purchase gap. It does not replace the lender’s assessment of repayments, commitments and the property.

Two incomes and one salary are different comparisons

The research compares the income needed to buy with median full-time earnings in London. That earnings measure concerns an individual worker, while a joint mortgage can be supported by the accepted income of two applicants.

A couple earning £50,000 each has £100,000 of combined gross earnings. They may therefore reach the model’s income benchmark without either person having a six-figure salary, provided the lender accepts those incomes.

That does not make their household finances interchangeable with those of a single £100,000 earner. Dependants, existing loans, childcare and other expenditure can produce a different affordability result.

As MoneyHelper explains, lenders consider income alongside outgoings and employment circumstances. For applicants receiving bonuses, commission or business income, the amount accepted by the lender can also differ from the headline annual earnings figure.

Prices have fallen, but the cash and payment barriers remain

London was the only region in e.surv’s report to record an annual price fall. The capital’s 1.3% decline contrasts with 1.9% growth across Great Britain, where the average reached £333,000.

There has also been progress on earnings. The report finds wages have outpaced house prices in every region since 2023. In London, annualised earnings growth of just over 8% has coincided with house prices falling by around 1% a year.

That improves the relationship between prices and earnings, but it does not put the deposit into a buyer’s savings account. Nor does it return the monthly mortgage cost to the levels associated with much lower interest rates.

A first-time buyer may therefore have better earnings relative to the property they want while still finding the transaction difficult. The improvement is real, but its practical value depends on how much cash and borrowing the household needs.

Less cash upfront means a larger monthly commitment

Using the same property price, a buyer with a 25% deposit would need a £449,025 mortgage. With a 10% deposit, the loan rises to £538,830.

At a hypothetical 5% interest rate over 30 years on a capital-and-interest basis, the monthly payments would be approximately £2,410 and £2,893 respectively. The smaller deposit therefore adds around £482 a month, before fees.

Those calculations hold the rate and term constant to show the effect of borrowing more. Actual products may have different pricing at different loan-to-value levels, so the real comparison could change again.

The benefit of higher-LTI lending is access to a larger loan. Whether that loan leaves enough room for the rest of the household budget is a separate, equally important question.

What the findings mean for a London property search

The city-wide average is a reference point, rather than a price every buyer must pay. Location, property type and space requirements will determine whether a particular search sits above or below it.

For someone viewing homes around £600,000, the useful exercise is to identify the actual constraint. Is the available deposit too small, does the accepted income support too little borrowing, or would the required monthly payment be uncomfortable?

Those problems call for different responses. Negotiating the price or changing the search area can reduce the loan needed. A fuller assessment of variable income or access to a suitable higher-multiple product may change the borrowing figure. Neither necessarily solves a stretched monthly budget.

Willow can compare the target purchase with the deposit available after costs and the income a lender can use. The London research makes that assessment more relevant: £100,000 of earnings is only one part of the purchase, and the cash contribution behind the headline is substantial.