Mortgages for £6 million or more: what it takes and what it costs

A mortgage of £6 million or more is possible, but it’s a different game to a standard high-street application. Lenders that can consider very large loan amounts tend to be specialist or private, and they will look closely at your affordability, deposit strength, credit profile and overall financial position.

This guide explains the main factors that affect whether a £6m+ mortgage is realistic, what you may need to budget for monthly repayments, and how working with a specialist mortgage broker can help you approach lenders that may be able to consider your circumstances.

Can you get a mortgage of £6 million or more?

Yes—but options are limited. Many mainstream lenders apply maximum loan limits that make very large mortgages unavailable.

In practice, borrowers seeking £6m+ typically need one or more of the following:

• A high level of income and/or assets that supports affordability
• A strong deposit (often higher than for smaller loans)
• A credit history that lenders are comfortable with
• Circumstances where a lender’s underwriting approach may be more flexible (for example, where a high-net-worth approach is relevant)

Because the lender universe is narrower, broker support is often helpful. Specialist brokers can help you understand which lenders are likely to consider large residential loans and how to present your application.

How much does a £6 million mortgage cost per month?

Your monthly repayment depends on:

• the interest rate
• the mortgage term
• whether the mortgage is repayment or interest-only

In general, a longer term reduces the monthly payment, but increases the total interest paid over the life of the mortgage.

Repayment example (illustrative)

The table below shows example monthly repayments for a £6,000,000 repayment mortgage across different interest rates and terms. (These figures are for illustration only and assume the interest rate stays the same for the full term.)

Interest-only: lower payments, but a different plan

With an interest-only mortgage, you pay only the interest each month. The loan amount (the capital) remains outstanding and must be repaid at the end of the term using a separate plan (for example, from savings, investments, or another agreed repayment strategy).

That usually means lower monthly payments, but it also means you need a credible method to clear the full balance when the term ends.

How much income do you need for a £6 million mortgage?

Every lender calculates affordability differently, but most will assess your ability to make the repayments based on your income (and sometimes wider financial circumstances).

Many borrowers will see income multiples in the range commonly used by lenders for larger lending, but for very large mortgages the picture can vary depending on:

• your income type (salary, bonus, dividends, self-employed earnings)
• stability of earnings and employment history
• other commitments and existing borrowing
• how the lender views your overall wealth

In some circumstances, a lender may consider a higher borrowing capacity than standard income-multiple approaches—particularly where a high-net-worth style underwriting is relevant.

A broker can help you understand what lenders are likely to focus on and whether your income profile is likely to be treated in a way that supports the loan size you want.

How much deposit do you need for a £6 million mortgage?

For very large mortgages, deposit requirements tend to be stricter than for smaller loans.

As a rule of thumb, some lenders that offer mortgages above £1 million may expect a larger deposit. 25% is a commonly referenced benchmark for large lending, but the exact deposit and loan-to-value (LTV) you may need depends on the lender, the property, and your overall financial position.

In some cases, specialist lenders may consider alternative structures or ways of assessing wealth—but this is highly circumstance-dependent.

Repayment vs interest-only: which is right for a £6m+ loan?

Choosing between repayment and interest-only is one of the biggest decisions for a large mortgage.

Repayment mortgages

• You pay off both interest and part of the capital over time.
• Monthly payments are typically higher than interest-only.
• You don’t need a separate capital repayment vehicle.

Interest-only mortgages

• Monthly payments are typically lower.
• You must have a credible plan to repay the capital at the end of the term.
• Lenders will usually want to see evidence that the repayment strategy is realistic.

A specialist broker can help you compare the options in a way that reflects your long-term plans—not just the initial monthly figure.

Why £6m+ mortgages are harder to get

The process is broadly similar to other residential mortgages—there’s still affordability, documentation, and valuation—but the challenge is often finding a lender willing to consider the size of the loan.

With larger loan amounts, lenders may:

• apply stricter underwriting
• require lower LTVs (higher deposits)
• focus more heavily on evidence of wealth and income stability
• limit availability to specialist channels

Because of this, a scattergun approach (applying to lenders that can’t lend that amount) can waste time and create avoidable friction. Specialist broker input can help target the right lenders from the start.

How a specialist broker can help with a £6 million mortgage

A broker’s value in large-loan cases is usually practical, not theoretical. They can help you:

• Identify lenders that may be able to consider £6m+ mortgages
• Understand likely deposit/LTV expectations for your circumstances
• Present your application in a way that aligns with how specialist lenders assess risk
• Prepare for the documentation lenders typically expect (income evidence, bank statements, ID, deposit evidence, and more)
• Plan the process around key milestones like valuation and offer conditions

If you’re aiming for a mortgage of this size, it’s often worth speaking to a broker who regularly handles large and high-net-worth lending.

What to do next

If you’re considering a £6 million or more mortgage, the most useful next step is to get a clear view of:

1. whether the loan size is likely to be supported by your income and/or assets
2. what deposit and LTV range you should expect
3. whether repayment or interest-only is the better fit for your long-term plan

A specialist broker can then help you approach lenders that are genuinely able to consider your application.

If you’d like to discuss your options, make an enquiry and we’ll arrange a no-obligation conversation with a specialist mortgage broker.