Fixed rate ending / thinking of remortgaging?
Start with the true cost of switching
Fees, ERCs and interest in one view. Pick a free UK calculator below — no sign-up, illustrative only.
Published by Rodway Labs — not a mortgage adviser
Remortgage Lab editorial · Published · Updated
Calculators
See all calculators- Should I switch?Start here
True cost
Net cost of switching after ERC, fees, cashback and interest.
Open calculator → - Stay or switch?
Vs product transfer
Compare staying (product transfer) versus remortgaging to a new lender.
Open calculator → - Spare cash
Overpay vs remortgage
Lump-sum overpayment versus remortgage interest, ERC and fees.
Open calculator → - Know your payment
Repayment
Monthly capital-and-interest payment, total interest and repayable amount.
Open calculator → - Pay down faster
Overpayment
How regular or one-off overpayments cut interest and term (ERC-aware).
Open calculator → - Borrowing ballpark
Affordability
Income-multiple borrowing ballpark with a stress-rate payment note.
Open calculator → - Leaving a deal early
ERC calculator
Estimate ERC via % of balance or months-of-interest methods.
Open calculator → - Buying costs
Stamp duty (England)
England & NI residential SDLT — standard, first-time buyer and additional rates.
Open calculator → - Pricing bands
LTV & equity
Current LTV, equity and distance to a target pricing band.
Open calculator →
True cost first — not a rate hunt
Fees and ERCs often decide the case — start there before hunting rates. One calm path for UK homeowners: estimate whether switching beats staying, then compare a product transfer and check your timing.
- 1True costFees, ERC and interest in one estimate
- 2Vs product transferStay with your lender or switch
- 3TimingWhen to remortgage · Fixed rate ending
EXAMPLE: does switching beat staying?
An illustrative remortgage scenario using labelled EXAMPLE rates and fees. Scenario rates, not a market quote. 4.19%, 4.39%, 4.14% and 7.49% SVR on this site are labelled EXAMPLE figures, last checked 2 November 2026. Plug the same figures into the true-cost calculator — or swap in your own offer numbers.
- Balance
- £185,000
- Remaining term
- 22 years
- Current product
- 4.19% fixed, 4 months left
- ERC
- 2% of balance
- Product-transfer rate
- EXAMPLE 4.39%
- New-lender rate
- EXAMPLE 4.14%
- Fees to switch
- EXAMPLE £1,499
- Cashback
- EXAMPLE £250
- Comparison period
- 24 months
All EXAMPLE figures are illustrative only — not a quote, offer or recommendation.
Run this EXAMPLE in the true-cost calculatorGuides worth reading
When to remortgage: start six months before your fix ends
Six-month UK remortgage timeline: start early, switch the day any ERC ends, and see what doing nothing costs in a worked EXAMPLE. Last checked 15 October 2026.
Product transfer explained: how it works
What a UK product transfer is versus a full remortgage — fees, ERCs, time and criteria. Conceptual guide; full £ EXAMPLE on the companion page. Last checked September 2026.
Product transfer vs remortgage: a worked EXAMPLE in pounds
Same EXAMPLE house, two columns: net cost after ERC, fees, cashback and 24-month interest. Fees and ERCs decide before the rate gap. Last checked September 2026.
What happens when your fixed-rate mortgage ends
A UK fixed rate ending usually means SVR unless you arrange a product transfer or remortgage. Last-eight-weeks plan, documents, and a worked EXAMPLE.
All calculators are illustrative and not personalised financial advice. Remortgage Lab is not a lender or broker. Calculator disclaimer.