Second Charge vs Remortgage: The Real Cost Comparison
A second charge bridging loan has a higher headline rate than a remortgage. That doesn't mean it costs more. Here's how to actually work out which route is cheaper for your situation, with worked numbers.
If you need extra capital and already have a mortgage in place, you have two main routes: a second charge bridging loan sitting behind your existing mortgage, or a full remortgage that replaces it entirely. The bridge carries the higher headline interest rate. But rate is not the same as cost — and the comparison that actually matters is total cost over the period you need the money, not rate against rate in isolation.
The Three Numbers That Actually Decide This
Before running any numbers, find three figures from your existing mortgage:
| Early repayment charge | Usually 1–5% of the outstanding balance — check your mortgage offer or annual statement |
| Time you need the capital | Second charge bridging is short-term (1–24 months); the shorter your need, the more it favours the bridge |
| Existing rate vs current remortgage rates | If your existing deal is meaningfully cheaper than today's rates, a remortgage forfeits that value |
The ERC is usually the deciding factor. In the majority of cases we see, whether a second charge bridge or a remortgage works out cheaper comes down almost entirely to whether — and how large — an early repayment charge applies. Everything else in the comparison tends to be a smaller swing factor by comparison.
Worked Example: When Second Charge Wins
Scenario A — Fixed-Rate Mortgage, 18 Months Remaining
Property worth £400,000. Existing mortgage £200,000 at a fixed rate with 18 months left on the deal and a 3% early repayment charge. Capital needed: £60,000, for 9 months, to fund a time-sensitive opportunity.
| Cost item | Second charge bridge | Remortgage |
|---|---|---|
| Early repayment charge | £0 — avoided | £6,000 (3% of £200k) |
| Interest on £60,000, 9 months | £5,400 (1.00% pm) | ~£1,755 (extra borrowing) |
| Arrangement / product fee | £1,050 (1.75%) | £999 |
| Legal & valuation | £1,400 | £1,200 |
| Total cost | £7,850 | £9,954 |
The second charge bridge comes out over £2,000 cheaper — despite a far higher headline interest rate — because the early repayment charge dominates the remortgage cost. This is the single most common scenario where second charge wins.
Worked Example: When Remortgage Wins
Scenario B — No ERC, Capital Needed Long-Term
Same £400,000 property and £200,000 mortgage, but the deal has already moved onto the lender's variable rate, so no ERC applies — and the borrower needs the £60,000 for an indefinite period rather than a short-term need.
| Cost item | Second charge bridge (12mo, then refinanced) | Remortgage |
|---|---|---|
| Early repayment charge | £0 | £0 — none applies |
| Interest on £60,000, 12 months | £7,200 (1.00% pm) | ~£2,340 (extra borrowing) |
| Arrangement / product fee | £1,050 | £999 |
| Legal, valuation & future refinance costs | £1,400 + a second transaction later | £1,200 (one transaction only) |
| Total cost | £9,650+ | £4,539 |
Without an ERC to avoid, and with an open-ended need for the capital, a remortgage is clearly cheaper. The second charge bridge would also need refinancing again at the end of its term — a second round of costs the remortgage avoids entirely.
A Quick Way to Check Which Applies to You
Find your ERC in pounds
Your mortgage statement or lender portal will show the percentage and the balance it applies to.
Estimate the second charge bridge interest
Loan amount × monthly rate × number of months you'll actually hold it.
Compare the ERC against the bridge interest
If the ERC alone is close to or higher than the bridge interest, the second charge route is very likely cheaper.
Factor in how long you'll need the capital
No ERC and a need beyond 12–18 months usually points to a remortgage on pure cost.
Speed changes the calculation. A remortgage typically takes four to eight weeks; a second charge bridge with prompt lender consent can complete in five to ten working days. If you're funding an auction deposit or a time-sensitive purchase, the bridge may be the only option that meets your deadline — regardless of which works out cheaper on paper.
Other Factors Beyond Pure Cost
Affordability at remortgage stage. If your income, credit profile, or property portfolio has changed since your original mortgage, you may not pass affordability for a full remortgage even if you want one. A second charge bridge is assessed primarily on equity and exit strategy, not full income affordability in the same way a mortgage application is.
First charge lender consent. A second charge bridge requires your existing lender's permission to register behind them. This is usually straightforward but can take days to weeks depending on the lender, and in rare cases is refused outright — see our guide to equitable charge bridging loans for the fallback route when that happens.
Frequently Asked Questions
Is a second charge bridging loan always more expensive than remortgaging?
No. The monthly rate is higher, but total cost depends heavily on whether your existing mortgage carries an early repayment charge. Where an ERC applies, a second charge bridge is very often cheaper overall — as shown in the worked example above.
How do I find out if I have an early repayment charge?
Check your original mortgage offer document or your most recent annual mortgage statement — both should state the ERC percentage and the period it applies to. Your lender's online portal or a quick call to them will also confirm it.
Can I remortgage instead of taking a second charge bridge?
In most cases yes, subject to affordability and lender criteria. Whether it's the better choice depends on the cost comparison above — we model both options on every enquiry before recommending a route.
What if I need the money faster than a remortgage allows?
A second charge bridge can complete significantly faster — often five to ten working days versus four to eight weeks for a remortgage — making it the only realistic option for time-sensitive needs like auction deposits, even where a remortgage would be marginally cheaper on cost alone.
What if my first charge lender refuses consent for a second charge?
An equitable charge bridging loan may still be available — it creates a binding legal interest in the property without requiring the first lender's consent, though at a narrower lender pool and a rate premium. See our equitable charge bridging loans guide for full detail.
Related Reading
Second charge bridging loans — the full guide to rates, CLTV, consent and eligibility. Equitable charge bridging loans — the route to capital when your first charge lender refuses consent. Second charge no valuation bridging — raising capital behind an existing mortgage without a full inspection.
Get Your Actual Numbers Compared
Send us your property value, existing mortgage balance and rate, ERC if applicable, and the capital you need. We'll model both routes side by side — real figures, not estimates — across our 200+ lender panel, the same day.
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