Second Charge Mortgage or Remortgage to Borrow More?

Published 25 September 2026. Figures correct as at this date.

You have a mortgage you are happy with — a rate you locked in at a better time, years left to run, and no particular reason to touch it. Then something comes up. An extension. School fees. A car. You need to borrow a meaningful sum, and your instinct is to remortgage and roll it all into one.

That instinct is understandable. It is also often wrong.

Is a second charge mortgage better than remortgaging?

Sometimes yes — but the honest answer is that it depends on four variables specific to your situation: your existing rate, your remaining mortgage balance, the size of the early repayment charge, and what unsecured borrowing would cost you. Your adviser is required to walk you through all four options before recommending any of them.

Under FCA rules — specifically MCOB 4.4A.8AR — where a customer wants to increase borrowing secured on a property under an existing regulated mortgage contract, the firm must first inform the customer, either orally or in writing, that the following alternative finance options may be available and more appropriate: a further advance from the existing lender; a second charge regulated mortgage contract (or a new first charge, if the firm offers second charge services); or unsecured lending. That is not a soft suggestion. It is a disclosure requirement.

What are the four options in plain terms?

The four routes are: remortgaging to a new first charge deal, taking a further advance from your existing lender, taking out a second charge mortgage with a separate lender, or borrowing unsecured. Each has a different cost structure, a different risk profile, and a different effect on your existing arrangements.

Remortgaging replaces your current mortgage entirely. If your existing rate is materially below what is available today — and with the Bank Rate where it is today (Bank of England), many borrowers who fixed two or three years ago are in that position — remortgaging means giving up that rate on your entire balance, not just the additional sum. Our remortgage page covers how that route works in full. Legal fees are typically around £300–£500 and product or arrangement fees typically £0 to around £1,500 (indicative, from our experience of recent remortgage cases, checked October 2026), and what you pay depends on your circumstances. The legal side has more to it than one number — what you actually pay a solicitor on a remortgage, and when covers where free legals stop covering you. These are illustrative third-party estimates; your actual costs will depend on your individual circumstances, product choice, and current market rates. Before any of those, you may face an early repayment charge: typically between 1% and 5% of your outstanding balance (indicative, HomeOwners Alliance, checked October 2026), often reducing the further you are through the deal, and what you pay depends on your circumstances. On a large mortgage, that figure alone can make remortgaging the more expensive option, often by some distance. Our remortgage calculator can weigh an early repayment charge against the months left on your current deal.

A further advance is additional borrowing from your existing lender, kept separate from your current mortgage — often on a different rate and term. It avoids disturbing your existing deal and carries no early repayment charge on the first mortgage. The risk is that your existing lender may not offer competitive terms on the further advance itself, and you have no access to the wider market.

A second charge mortgage is a separate loan secured against your property, sitting behind your first mortgage in priority. It leaves your existing deal entirely intact — rate, term, lender, all unchanged. Regulation of second charge mortgages moved from the consumer credit regime into the mortgage regime following FCA Policy Statement PS15/9, published 27 March 2015, with the final rules largely coming into effect on 21 March 2016. That matters because it means second charge borrowers now have the same regulatory protections as first charge borrowers. The cost of registering a second charge at HM Land Registry under Scale 2 fees — guidance last updated 28 April 2025 — ranges from £20 electronically for properties up to £100,000, up to £140 electronically for properties above £1,000,000. Your home is security for both loans, and if you cannot service either, both lenders have a claim against it. That risk needs to be understood before proceeding.

Unsecured borrowing — a personal loan — carries no charge against your property. For smaller sums over shorter terms it is often a simpler route. The rate will typically be higher than secured borrowing, but you are not putting your home at risk for that specific debt.

When does a second charge mortgage make sense?

It tends to make sense when three things are true simultaneously: your existing first charge rate is significantly below current market rates; your early repayment charge would make remortgaging expensive; and the sum you need is large enough that unsecured borrowing would be materially more costly over the term. If only one or two of those apply, a different route may serve you better.

What does the comparison actually cost in practice?

The honest answer is that you cannot compare products on different terms, fee structures, and secured or unsecured bases without laying all of those variables out in the same calculation. An adviser who presents you with a single recommendation without first mapping the others is not giving you the full picture — and under MCOB 4.4A.8AR, they are required to.

The question is not which product sounds better in the abstract. It is which structure costs you least across the real term of the borrowing, given what you already have.

Lawes Financial Limited (FRN 1046161) is an appointed representative of Andrew Charles Consulting Ltd, which is authorised and regulated by the Financial Conduct Authority (FRN 304904). If you are weighing up these options for your own situation, take regulated mortgage advice tailored to your circumstances — not a general comparison. Get in touch directly to go through the numbers.

Sources

- MCOB 4.4A.8AR: where a customer is looking to increase the borrowing secured on a property under an existing regulated mortgage contract, the firm “must first inform the customer, either orally or in writing, that the following alternative finance options may be available and more appropriate” — a further advance, a second charge regulated mortgage contract (or a new first charge), or unsecured lending. — FCA Handbook, MCOB 4.4A.8AR (https://www.handbook.fca.org.uk/handbook/MCOB/4/4A.html) - Second charge mortgage regulation moved from the consumer credit regime into the mortgage regime; “our final rules largely come into effect on 21 March 2016”. — FCA Policy Statement PS15/9, published 27 March 2015 (https://www.fca.org.uk/publications/policy-statements/ps15-9-implementation-mortgage-credit-directive-and-new-regime-second) - Mortgage exit fee: “Up to £300. But some lenders won’t charge.” Early repayment charge: “typically between 1% and 5% although the percentage you pay often reduces over time.” — HomeOwners Alliance, Remortgaging costs, checked October 2026 (https://hoa.org.uk/advice/guides-for-homeowners/for-owners/remortgaging-costs/). These are indicative figures, and what you pay depends on your circumstances. - Indicative ranges for legal fees and product or arrangement fees: from our experience of recent remortgage cases, checked October 2026. Indicative, not a quote, and what applies to you depends on your circumstances. - Registering a new charge on an already-registered property is a Scale 2 fee: £45 by post or £20 electronically up to £100,000; £70 / £30 for £100,001–£200,000; £100 / £45 for £200,001–£500,000; £145 / £65 for £500,001–£1,000,000; £305 / £140 above £1,000,000. — HM Land Registry, Registration Services fees, guidance last updated 28 April 2025 (https://www.gov.uk/guidance/hm-land-registry-registration-services-fees) - The current Bank Rate is published by the Bank of England and changes with each decision. — Bank of England (https://www.bankofengland.co.uk/monetary-policy/the-interest-rate-bank-rate) - Lawes Financial Limited (FRN 1046161) is an appointed representative of Andrew Charles Consulting Ltd, which is authorised and regulated by the Financial Conduct Authority (FRN 304904). — Financial Conduct Authority (https://register.fca.org.uk/s/firm?id=001Sk00000sgMgAIAU)

---

Figures quoted are illustrative only. Your actual outcome will depend on your individual circumstances, loan size, term, and the products available to you.

This is not financial advice. Speak to an independent mortgage broker before making any decisions.

Lawes Financial Limited (FRN 1046161) is an appointed representative of Andrew Charles Consulting Ltd, which is authorised and regulated by the Financial Conduct Authority (FRN 304904).