What Is a Second Charge Mortgage?

Last updated: 11 September 2026

How a second charge mortgage works

When you take out a second charge mortgage, sometimes called a secured loan or a homeowner loan, a second lender registers a legal charge against your property, behind the charge your existing mortgage lender already holds. That's where the name comes from: the first charge is your original mortgage, the second charge is the new loan sitting behind it.

Because it's a completely separate agreement from your existing mortgage, your current lender, rate and remaining term are untouched. You simply take on a second, independent monthly payment alongside your existing mortgage payment. The two lenders don't need to be the same, and in most cases they aren't, your second charge lender is often a specialist secured lending provider rather than your everyday mortgage bank.

If your property is ever sold, or if you fall seriously behind on payments and it's repossessed, the first charge lender is repaid first from the proceeds, then the second charge lender. That ordering is part of why second charge rates are usually a little higher than first charge mortgage rates: the second lender is taking on slightly more risk.

Why homeowners choose a second charge mortgage over remortgaging

The most common reason is protecting a good existing mortgage deal. If you're part way through a fixed rate, remortgaging to raise money usually means paying an early repayment charge, sometimes several thousand pounds, to leave that deal early. A second charge mortgage avoids this entirely, because your first mortgage is never touched or replaced.

It can also be a practical option if your income or credit history has changed since you took out your original mortgage in a way that might make a full remortgage harder to arrange, since second charge lenders assess your current second-charge application on its own affordability terms, sometimes with more flexibility around credit history than a mainstream first-charge remortgage lender.

The trade-off is that second charge rates are typically higher than a remortgage rate, and you're managing two payments instead of one. Whether that trade-off is worth it depends on the size of your early repayment charge, how much longer your current deal has to run, and how the total cost compares to a remortgage or a further advance. This is exactly the kind of comparison a broker will run for you.

What a second charge mortgage typically costs

Rates and terms vary by lender, your loan-to-value and your credit history, but it's useful to see the numbers laid out. Below is a worked example using fixed illustrative figures, not a live quote.

	Amount
Current monthly payments (credit cards and a personal loan)	£410/month
New second charge mortgage payment (£18,000 at 7.9% over 15 years)	£169/month
Total repayable over the 15-year term	£30,420

As with any consolidation route, the monthly figure drops noticeably, but the total repaid over the full term is higher than the original £18,000 borrowed, because it's being repaid over a much longer period than the original credit agreements would have run for. Your broker will always show you this comparison before you commit to anything.

What lenders look for

Second charge lenders look at two main things: how much equity sits behind your existing mortgage, and whether you can afford the new payment on top of your current one. Equity is your property's value minus everything already owed against it, including your first mortgage. Affordability checks look at your income and your outgoings once the new second charge payment is added, similar to how any mortgage affordability check works.

Most lenders in this market will also want your existing mortgage payments to be up to date, and many will consider applicants with a mixed or adverse credit history, sometimes including defaults, missed payments or a CCJ, though the rate offered will typically be higher to reflect that. There's more detail on this in our bad credit hub.

Second charge mortgage vs a further advance: what's the difference

A further advance is similar in spirit, extra borrowing secured against your home, but it comes from your existing mortgage lender rather than a new one, and it's usually added to your current mortgage account rather than sitting as a separate agreement. Not every lender offers further advances, and those that do won't always approve one for debt consolidation specifically, so it's worth checking rather than assuming it's available.

A second charge mortgage, by contrast, is available from a much wider range of specialist lenders, which generally means more choice and more competition on rate, particularly if your own mortgage lender says no to a further advance or doesn't offer one for your purpose. Our further advance hub covers this route in more detail if you'd rather explore it first.

How the application process works

The process usually starts with a broker gathering some basic details about your property, your existing mortgage, and how much you want to borrow. They'll compare second charge lenders against remortgage and further advance options, and talk you through the real cost of each, not just the headline rate. Checking your options this way will not affect your credit score.

If a second charge mortgage looks like the right fit, you'll submit a full application, which includes an affordability assessment, a valuation of your property, and formal consent from your existing mortgage lender to register the new charge. Most straightforward second charge applications complete within a few weeks, though this varies by lender and how quickly documents come back. Your broker will keep you updated at each stage rather than leaving you to chase progress yourself.