Remortgage vs Further Advance: Which Is Cheaper to Release Equity in 2026?
If you want to borrow more against your home — for renovations, debt consolidation or a deposit for a second property — you can either remortgage the whole loan or ask your existing lender for a further advance. Here's how the two compare.
The Two Routes to Borrowing More Against Your Home
If you need to release additional borrowing secured against your property — for home improvements, debt consolidation, a deposit for a second property, or any other purpose — there are two main routes:
- Remortgage the entire loan. You repay your existing mortgage in full and take out a new, larger mortgage (existing balance + new borrowing) with either your current lender or a new one, at a new interest rate.
- Take a further advance. You keep your existing mortgage exactly as it is and add a separate tranche of new borrowing from the same lender, usually at that lender's current further-advance rate.
Remortgage Calculator
Compare your current mortgage deal with a new rate to see monthly savings, total interest saved, and whether remortgaging makes sense.
Remortgage calculatorWorked Example: £180,000 Balance + £40,000 New Borrowing
| Scenario | Existing balance rate | New borrowing rate | Blended effective rate |
|---|---|---|---|
| Further advance | 3.2% (2 years left on fix) | 5.4% (current further-advance rate) | ≈3.6% weighted average |
| Full remortgage | New deal at 4.9% on entire £220,000 | — | 4.9% on entire balance |
In this example, keeping the low legacy rate on the £180,000 and only paying the higher rate on the new £40,000 produces a lower blended cost than moving the whole £220,000 onto a new rate — even though the further-advance rate itself is higher than the remortgage rate.
The maths flips if your existing rate is already close to (or above) current market rates: in that case a single remortgage at one competitive rate on the full balance is normally cheaper, and simpler to manage with one lender, one rate, one renewal date.
Costs and Practicalities Compared
| Factor | Further advance | Full remortgage |
|---|---|---|
| Early repayment charge on existing deal | Not triggered | Triggered if still within a fixed/tracker deal |
| Valuation | Often automated, lower cost | Usually a full valuation required |
| Legal/conveyancing fees | Minimal or none | Solicitor needed to redeem old mortgage and register new charge |
| Speed | Typically faster | Typically 6–8 weeks |
| Number of rates to manage | Two (existing + new tranche) | One |
| Lender flexibility | Limited to your existing lender | Whole of market |
When a Second Charge Mortgage Is the Alternative
If your existing lender declines a further advance — commonly due to updated affordability rules, loan-to-value limits, or a change in your circumstances since your original mortgage — a second charge mortgage from a different lender is often the practical fallback. It sits "behind" your main mortgage (the first charge lender is repaid first if the property is ever sold in arrears), usually carries a higher rate than a first-charge mortgage, but avoids disturbing your existing deal entirely.
How to Decide
- Get your current lender's further-advance rate and compare it, blended with your existing rate, against the best available remortgage rate on the whole balance.
- Check whether your existing deal carries an early repayment charge, and how large it is — this can single-handedly tip the decision toward a further advance.
- Factor in valuation and legal costs on each route, which are usually lower for a further advance.
- If your lender declines, get a second-charge mortgage quote before assuming a full remortgage is the only option.
- Revisit the comparison whenever your existing fixed or tracker deal is due to end anyway — at that point, a full remortgage becomes directly comparable with no ERC to worry about.
Frequently asked questions
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