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In the UK, a second mortgage usually means a second charge loan secured on your home alongside your existing mortgage, or extra borrowing from your current lender. See how to get one, how much you can borrow and what lenders check.
Reviewed by David Sampson, Founder & Director · Created 19 October 2026 · Last reviewed 19 October 2026
TL;DR
A second mortgage is a loan secured on a home that already has a mortgage. In the UK it usually takes the form of a second charge mortgage from a different lender, which ranks behind your first mortgage. Some people also use the term for extra borrowing from their existing lender or for a second-home mortgage.
A UK second mortgage of the second charge kind is regulated by the FCA in the same way as a first mortgage when it is secured on the home you live in. It has its own rate, term and monthly payment, and the lender registers its charge at HM Land Registry behind the first. The guide to second charge mortgages covers how these loans are regulated, what they cost and the risks in more depth.
A mortgage to buy a second home, such as a holiday let or a property for a family member, is a separate first mortgage on a different property. It needs a deposit and is assessed on the new property, so it is not what most people mean by 2nd mortgages on their own home.
To get a second mortgage, work out your equity and what you can afford, compare second charge lenders and your current lender's further advance, then apply with proof of income and details of your first mortgage. The lender checks your credit and values the home before making an offer. Brokers can handle the comparison.
Take your home's current value and subtract what you still owe on the first mortgage.
Add the payments on both loans to your other outgoings and test them against your income.
Look at a second charge, a further advance from your lender and a remortgage side by side.
Provide proof of income, identity and your first mortgage details, often through a broker.
The lender values the home, checks your credit file and, if it agrees, makes an offer.
Lenders check your income, your existing commitments, your credit file and the property before agreeing a second mortgage. Because the loan is regulated when it is secured on your home, they must be satisfied you can afford the payments on both loans, including if interest rates rise. They also confirm your first mortgage balance with your current lender.
Can you get a second mortgage with an imperfect credit record? Some lenders consider missed payments or defaults, especially older settled ones, but the rate is usually higher and the maximum loan lower. Taking out a second mortgage while you are behind on your first is much harder, because most lenders treat current arrears as a serious concern.
How can I get a second mortgage approved more smoothly? Having recent payslips or accounts, bank statements, your mortgage statement and identity documents ready helps, as does knowing why you need the money and for how long. Many second charge lenders accept applications only through brokers, who check criteria before a full credit search is made.
How much you can borrow depends on your equity, your income and the lender's maximum combined loan to value across both mortgages. Take the most the lender will allow in total, subtract your first mortgage balance and that is the ceiling; affordability then decides whether you can borrow all of it.
For example, if your home is worth £300,000, you owe £150,000 on your first mortgage and a lender allows a combined loan to value of 75%, the most both loans can total is £225,000. Subtracting the first mortgage leaves up to £75,000 for the second loan, before affordability checks (example figures, not market data).
Each lender sets its own maximum combined loan to value, minimum and maximum loan and term, so the ceiling varies from lender to lender. A second mortgage calculator works out the combined loan to value, the equity left and the estimated payment from your own figures.
A second mortgage runs alongside your first, with its own rate, term and monthly payment. Your first mortgage deal is unaffected. If the home is sold, the first lender is repaid first and the second lender next from what is left, and missing payments on either loan can put the home at risk.
How does a second mortgage work over time? You repay it on the agreed schedule, either capital and interest or interest-only with a plan to repay the balance at the end. You can usually repay early, but fixed-rate deals often carry early repayment charges. If you sell or remortgage, both loans are normally repaid from the proceeds or the new mortgage.
If your current lender will lend more, a further advance adds the borrowing to your existing mortgage, sometimes on a separate rate. A second charge comes from a different lender and leaves your first mortgage alone. A remortgage replaces the first mortgage. The right route depends on your rate, charges and how much you need.
Comparing further advance or second charge side by side shows the trade-offs: a further advance keeps one lender, while a second charge can suit you if your lender will not lend more or its criteria do not fit. A remortgage can make more sense when your current deal is ending, because there are no early repayment charges to pay.
Whichever route you choose, compare the total amount repayable, including fees, over the same period rather than the monthly payment alone. Fees added to the loan are charged interest for the whole term. Second charge pricing depends mainly on the combined loan to value and your credit history, and the page on second mortgage rates explains what moves the price.
It can be when you have good equity and want to keep a low-rate first mortgage, but it adds a second debt secured on your home. Your home may be repossessed if you do not keep up repayments on either loan, so compare a further advance and a remortgage on total cost before deciding.
A second charge on the home you live in is regulated by the FCA as a mortgage, so the lender must check affordability on both loans and give you an illustration and time to consider the offer. Many first mortgages also require your current lender's consent before a second charge is registered.
None, when it is a second charge on your own home, because you are borrowing against the equity you already have rather than buying a property. A mortgage to buy a second home is different: it is a new first mortgage on that property and needs a deposit.
It depends on your equity, income and the lender's maximum combined loan to value across both mortgages. Subtract your first mortgage balance from the most a lender allows in total to find the ceiling, then affordability checks decide how much of that you can actually borrow.
Some lenders consider applicants with missed payments, defaults or county court judgments, particularly older settled ones, as the loan is secured on the home. Expect a higher rate and a lower maximum loan. Current arrears on your first mortgage make approval much harder with most lenders.
Usually, yes. In the UK, a second mortgage on your own home is normally a second charge mortgage from a different lender, ranking behind your first. The term is also used loosely for a further advance from your current lender, and sometimes for a mortgage on a second home.
Important: Your home may be repossessed if you do not keep up repayments on your mortgage. Information on this page is for general guidance only and does not constitute financial advice.Always verify details directly and seek independent advice before making financial decisions.