Direct answer
Second charge mortgage or remortgage: how to compare
A second charge mortgage is separate borrowing secured on a property behind the existing first mortgage. Remortgaging replaces the first mortgage, usually while raising any additional amount at the same time. Neither route is automatically cheaper or more suitable.
Compare the existing mortgage rate and early repayment charge, the new borrowing rate and term, every fee, total repayable, monthly affordability and credible alternatives. The FCA says advice should assess suitability rather than eligibility alone and should consider the customer's wider circumstances and alternatives.12
Key points
- A second charge leaves the existing first mortgage in place.
- A remortgage replaces the existing first mortgage with a new one.
- A lower monthly payment can still produce a higher total cost if debt runs for longer.
- Both mortgages are secured on the home if a second charge is used.
01
The structural difference
With a remortgage, the new lender normally repays the existing first mortgage and registers a replacement first legal charge. With a second charge, the existing mortgage stays in place and a different loan sits behind it. You then have two secured credit agreements and two payments unless the second lender's arrangement differs.
The first charge lender has priority over the second charge lender if the property is sold and the secured debts are repaid. That priority does not remove the borrower's responsibility for the second charge balance.
| Question | Second charge | Remortgage |
|---|---|---|
| Existing mortgage | Usually stays in place | Replaced by the new mortgage |
| Additional borrowing | Separate secured loan | Included in the new first mortgage |
| Payments | Usually two secured payments | Usually one mortgage payment |
| Existing early repayment charge | May be avoided | May become payable |
| Existing low fixed rate | Can remain on the first mortgage | Usually given up |
| Costs to compare | Second-charge rate, term and fees | New mortgage rate, fees and exit costs |
02
When a second charge may enter the comparison
A second charge can be relevant when replacing the first mortgage would trigger a material early repayment charge, give up a favourable existing rate or be difficult because the borrower's circumstances have changed. It may also allow the additional borrowing to use a different term from the main mortgage.
Those features do not prove suitability. Second-charge pricing and fees may be higher than a first mortgage, and running borrowing over a long term can materially increase total interest. The purpose of the borrowing and the benefit to the customer need to justify the complete cost and risk.1
03
When remortgaging may enter the comparison
Remortgaging can be worth exploring when the existing deal is ending, suitable first-charge products are available and replacing the full mortgage produces a competitive overall result. It can also simplify the position into one secured payment.
The comparison must still include any early repayment charge, arrangement or advice fees, valuation and legal costs, the new mortgage term and the effect of moving the whole balance onto a different rate. A lower rate on the additional borrowing is not enough if the existing balance becomes more expensive.
04
Extra care when the purpose is debt consolidation
Consolidating unsecured debt into a mortgage can reduce the immediate monthly outgoings, but it changes unsecured borrowing into debt secured on the home and may extend repayment over many more years. The total repaid can rise even where the monthly payment falls.
The FCA's 2026 review highlighted the need to understand the cause of the debt, whether the proposed consolidation is sustainable, what alternatives exist and whether the recommendation delivers an appropriate outcome. It also identified concerns about high and difficult-to-compare fees in parts of the reviewed market.1
05
The evidence-led comparison checklist
Ask for like-for-like figures over the same comparison period. The answer should show what happens to the existing mortgage as well as the additional borrowing, not only a headline payment for the new money.
- Existing first mortgage balance, rate, remaining term and deal end date
- Any early repayment charge and other exit costs
- Additional amount required and the purpose of each part
- Monthly payment and total repayable under each credible route
- All product, lender, broker, valuation and legal fees
- Whether fees are paid upfront or added to secured borrowing
- Affordability now and under foreseeable changes
- Further advance, unsecured borrowing, waiting or reducing the amount as alternatives
Common questions
Questions answered
Is a second charge mortgage the same as remortgaging?
No. A second charge is a separate secured loan behind the existing first mortgage. A remortgage replaces the existing first mortgage with a new one.
Is a second charge cheaper than remortgaging?
Not automatically. It may preserve an existing mortgage rate or avoid an early repayment charge, but the second-charge rate, fees, term and total repayable must be compared with remortgaging and other alternatives.
Can a second charge be used for debt consolidation?
Potentially, subject to suitability and affordability. It converts unsecured borrowing into debt secured on the home and can increase the total cost if repayment is extended, so the cause of the debt and alternatives need careful assessment.
Will I have two mortgage payments?
Usually, yes. The first mortgage continues and the second charge has its own payment and terms. Both are secured on the property.
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. Current FCA findings on advice, fees, affordability, alternatives and customer outcomes.
- 2MCOB 11: Responsible lending and financing
Financial Conduct Authority. The responsible lending framework for regulated mortgage contracts.
Published 4 August 2026. Last reviewed 4 August 2026.