Direct answer
Second charge, further advance or remortgage: the adviser’s comparison
A further advance adds borrowing with the existing lender. A remortgage replaces the whole mortgage. A second charge is a separate loan from a different lender, secured behind the existing mortgage, which stays in place.
A further advance is often the simplest if the existing lender will lend. A second charge tends to fit when the current rate is worth keeping, a remortgage would trigger an early repayment charge, or the client’s circumstances no longer meet mainstream criteria. Compare total cost over the same period, including every fee and early repayment charge.1
Key points
- Start with the existing mortgage: rate, deal end date and early repayment charge.
- A further advance keeps one lender but may be priced differently from the main mortgage.
- A remortgage can give one payment but may cost an early repayment charge and a higher rate on the whole balance.
- A second charge keeps the first mortgage intact but usually costs more than first-charge borrowing.
- Compare total cost, not the monthly payment.
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The three options side by side
Each route raises money against the same property. They differ in what happens to the existing mortgage, who lends, and what it costs to set up.
| Further advance | Remortgage | Second charge | |
|---|---|---|---|
| Existing mortgage | Stays, with extra borrowing added | Replaced | Stays untouched |
| Lender | Existing lender | New or existing lender | A different, specialist lender |
| Early repayment charge on the main mortgage | Usually not triggered | May be payable | Not triggered |
| Rate on the new money | Set by the existing lender, often different from the main deal | One rate on the whole balance | Its own rate, usually higher than first-charge borrowing |
| Criteria | Existing lender’s current criteria | New lender’s full criteria | Specialist criteria, often more flexible on income and credit |
| Payments | Usually one, sometimes split | One | Two |
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When a further advance fits
If the existing lender will lend the amount at a fair rate, a further advance is usually the simplest route: no new lender and often lower set-up costs. It depends on the client still meeting that lender’s current criteria, which can be the sticking point for self-employed clients, those whose income has changed, or those with recent credit problems.
03
When a remortgage fits
A remortgage is often the natural choice when the current deal is ending or there’s no early repayment charge, and the client can get a competitive rate on the whole balance. It gives one payment and one lender.
It is expensive when it means paying an early repayment charge or moving a low fixed rate on a large balance to a higher rate just to raise a smaller amount.
04
When a second charge fits
A second charge tends to fit when the first mortgage is worth keeping, because of a low fixed rate or a material early repayment charge, or when the client’s circumstances no longer meet the existing lender’s criteria. Specialist lenders can look at variable income, credit history and non-standard property more flexibly.
Second charge rates are usually higher than first-charge rates, so the comparison has to show the total cost of the new borrowing against the cost of the alternatives.1
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If the purpose is debt consolidation
Whichever route, consolidating unsecured debts secures them on the home and can extend how long they take to repay. MCOB 4.7A.15R requires advisers to weigh the cost of extending the repayment period, whether securing the debt is appropriate and, where there are payment difficulties, whether negotiating with creditors would be better.2
Find the term at which consolidating stops saving the client money before choosing a route. Our free break-even calculator does this with fees and early repayment charges included.
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What to gather before comparing
These figures let you, or the specialist you refer to, compare the routes properly from the start.
- Existing mortgage balance, rate, deal end date and early repayment charge
- Whether the existing lender offers further advances, and on what terms
- Amount needed and what it’s for
- Every debt to be cleared, with balance, APR, monthly payment and early repayment charge
- Income, how it is evidenced, and any recent credit events
- Property value and type
Common questions
Questions answered
Is a further advance cheaper than a second charge?
Often, if the existing lender will lend at a fair rate, because first-charge pricing is usually lower. A second charge can still cost less overall where a further advance isn’t available or a remortgage would trigger an early repayment charge.
When does a second charge make more sense than a remortgage?
Usually when the existing mortgage has a low fixed rate or a material early repayment charge, or when the client no longer meets mainstream criteria. The total cost of each route should be compared over the same period.
Does a second charge affect the existing mortgage?
The first mortgage stays in place with the same rate and terms. Some first-charge lenders must be notified or give consent, which the specialist handles.
How do I compare the total cost of consolidating debts?
Compare the total repayable on each route, with all fees and early repayment charges, against the total cost of clearing the debts as they stand. A break-even calculator shows the term at which consolidating stops saving money.
Evidence
Sources and review
Material factual claims were checked against the primary and public-interest sources below. Product criteria and the wider market can change after the review date.
- 1Second charge mortgages: improving outcomes for consumers
Financial Conduct Authority. FCA findings on comparing options, fees and total cost in second charge advice.
- 2MCOB 4.7A: Suitability of regulated mortgage contracts
Financial Conduct Authority Handbook. The debt consolidation requirements in MCOB 4.7A.15R.
Published 15 October 2026. Last reviewed 15 October 2026.