What the Cost Comparison Actually Looks Like Before You Decide
A £275,000 mortgage coming off a fixed rate has two options. Accept the product transfer your existing lender offers. Or remortgage to a new lender. On a like-for-like comparison – 5.14% product transfer versus 4.62% remortgage – the total cost gap over five years is around £3,800 after fees. Same property. Same borrower. Different decision.
The challenge is that the better option isn’t always the same one. For some homeowners, remortgaging saves thousands. For others, the fees and affordability reassessment make a product transfer the smarter move. The answer depends on your rate gap, your loan size, your financial position, and how much time you have before your deal ends.
This page covers how each option works, when switching lender saves money, when staying put makes more sense, and the cost comparison most homeowners skip before they decide.
Not sure which deal makes sense before your fixed rate ends? UK Mortgage Broker compares product transfer rates from your existing lender against the full remortgage market – so you can see the real cost difference before you decide.
What Is a Product Transfer?
A product transfer means staying with your existing mortgage lender and moving onto a new deal from their own range. You’re not changing lender. The bank or building society you’re already with switches you from your expiring product onto a new fixed or tracker rate they offer internally.
For most borrowers the process is quick. Your lender already holds your details, has the property on their system, and in many cases doesn’t require a full affordability reassessment or a new valuation. That makes it faster and less admin-heavy than a full remortgage application.
The practical appeal is obvious. No solicitors. Minimal paperwork. Decisions made quickly.
But speed and convenience are not the same as value. Some lenders offer highly competitive retention rates to keep existing customers. Others price their internal deals well above what’s available on the open market – and they rely on inertia to make sure most customers don’t check.
In practice: A borrower with £280,000 outstanding was offered a product transfer at 5.39%. A whole-of-market search found an alternative lender at 4.74%. Over a five-year fixed term, that gap is more than £6,000 in additional interest. The internal deal required no effort. It also cost significantly more.
What Is a Remortgage?
A remortgage means moving your mortgage from your current lender to a new one. The new lender pays off what you owe and takes over the mortgage on the same property.
Unlike a product transfer, remortgaging involves a full application. The new lender assesses your income, outgoings, credit history, and the property value before approving the deal. That takes longer and involves more paperwork – but it opens up the entire mortgage market rather than the product range of a single lender.
Most homeowners remortgage to get a better rate, reduce monthly payments, borrow additional funds, or access more flexible terms than their current lender offers.
Costs to factor in: arrangement fees typically run £500-£999, legal fees are often covered by the new lender as a cashback incentive on competitive deals, and valuations are frequently waived on lower LTV remortgages. The headline rate is only part of the picture.
In practice: A borrower with £320,000 outstanding was paying 5.65% on a product transfer. A remortgage to a new lender came in at 4.89%. The arrangement and legal fees totalled £1,250. Net saving over five years: approximately £7,700 – more than six times the cost of switching.
For a full breakdown of how lenders assess affordability when you remortgage, see our page on how lenders calculate mortgage affordability.
Key Differences
| Feature | Product Transfer | Remortgage |
| Lender changes | No | Yes |
| Affordability checks | Sometimes limited | Full assessment |
| Credit checks | Often lighter | Full underwriting |
| Legal work | Minimal in many cases | Usually required |
| Access to wider deals | No | Yes – full market |
| Completion speed | Faster | Slower |
| Upfront fees | Usually none | Arrangement + legal fees |
| Potential savings | Limited to one lender’s range | Full market competition |
| Flexibility | Depends on current lender | More product choice |
The table above shows the mechanics. What it doesn’t show is the financial impact – which is where most homeowners make the wrong call.
A product transfer only gets you what your existing lender is willing to offer. That might be competitive. It might not be. You won’t know unless you check the market first.
A remortgage puts you in front of every lender competing for your business. That competition drives rates down in a way that one lender’s internal range never can.
The gap between the two isn’t always large enough to justify switching. But it’s always worth finding out what that gap actually is before your deal ends – not after.
The rate difference between your lender’s product transfer and the open market can be checked in one conversation – before you commit to anything. UK Mortgage Broker compares both options across the full market and tells you the true cost difference including fees.
When to Stay with Your Lender
There are genuine situations where a product transfer is the right call – not just the convenient one.
Your affordability position has changed. If your income has dropped, your outgoings have increased, or you’ve taken on additional debt since your original mortgage, a new lender will run a full affordability assessment against today’s income and expenditure. Your current lender may allow a product transfer without that reassessment. In some cases that’s the only way to secure a new rate at all.
Your credit profile has taken a hit. Missed payments, a CCJ, or increased unsecured debt in the last two to three years can make external underwriting more difficult. Staying with your current lender avoids that scrutiny. It’s not a permanent solution, but it avoids a declined application going on your credit file.
The rate gap doesn’t justify the switching costs. If your lender’s product transfer rate is 4.95% and the best remortgage available is 4.79%, the gross monthly saving on a £250,000 mortgage is around £24. Factor in arrangement fees of £999 and legal costs of £300, and the break-even point is nearly five years – beyond the length of most fixed products. The maths doesn’t work.
Speed is critical. A product transfer can typically be arranged in days. If you’re running close to the end of your deal and need to avoid landing on your lender’s standard variable rate – which will be significantly higher – a product transfer gets you onto a new rate fast while a full remortgage application is processed.
When to Switch Lenders
Remortgaging makes the clearest financial case when the rate gap between your current lender and the open market is large enough to outweigh the switching costs.
The rate gap is significant. On a £300,000 mortgage, a 0.50% rate difference is worth roughly £75 per month – £4,500 over a five-year fix. Once arrangement and legal fees are accounted for, that’s still a net saving of over £3,000. The bigger the mortgage, the more a rate gap matters.
Your finances have improved. Higher income, lower debt, or a significant rise in your property’s value since you originally took out the mortgage can all open up better deals than you could access before. A new lender sees your current position, not the one from five years ago.
You want to borrow more. A product transfer is a rate switch, not a borrowing increase. If you’re looking to release equity for home improvements, debt consolidation, or other purposes, a remortgage with a new lender is the route that makes additional borrowing possible. See our page on how much you can borrow on a UK mortgage for how lenders calculate what you can raise.
You’re heading towards your lender’s SVR. Standard variable rates typically run 2-3% above current fixed rates. On a £300,000 mortgage, the difference between a 4.69% fix and a 7.99% SVR is around £500 per month. Remortgaging before the SVR kicks in is almost always the right move when the numbers are that far apart. If you want rate flexibility without committing to a new fixed deal, see how a tracker mortgage compares before you decide.
Cost Comparison
Most homeowners focus on monthly payments. The number that actually matters is total cost over the fixed term – rates, fees, and all charges included.
£275,000 mortgage, 25 years remaining
| Product Transfer | Remortgage | |
| Rate | 5.14% fixed | 4.62% fixed |
| Monthly payment | £1,633 | £1,547 |
| Arrangement fee | None | £999 |
| Legal fees | None | £300 |
| 5-year interest cost | £97,980 | £92,820 |
| Total cost over 5 years | £97,980 | £94,119 |
| Net saving | £3,861 |
The remortgage carries £1,299 in upfront fees. It still saves £3,861 over the fixed term. The saving shows up in the full five-year figure – not in the monthly payment or the headline rate.
The larger the mortgage balance, the more significant the gap. On a £400,000 mortgage at the same rates, the five-year saving from remortgaging increases to over £5,600 net of fees.
Use our uk mortgage rates page to see current rates by LTV and product type before running your own comparison.
What Most Homeowners Get Wrong
Comparing headline rates rather than total cost. A lower rate with a £999 arrangement fee and £300 legal costs can end up more expensive than a slightly higher rate with no fees – depending on your loan size and how long you hold the deal. The only number that matters is the total five-year cost after every charge is included.
Assuming their current lender will offer the best rate. Banks know that most customers accept the first offer they receive. Product transfer rates are not always competitive – they’re priced for convenience, not value. Checking the open market first takes one conversation. Not checking it can cost thousands.
Leaving it too late. Most lenders let you lock in a new rate up to six months before your current deal expires. Waiting until the final few weeks removes options, limits lender choice, and raises the risk of rolling onto a standard variable rate while your application is processed.
Overlooking alternatives entirely. A remortgage and a product transfer are not the only two options. If your affordability has changed but you still need to release equity, a second charge mortgage lets you borrow against your property without disturbing your existing rate or passing a full remortgage assessment. For a full breakdown of why mortgage applications fail and how to avoid it, see our page on why mortgages get declined.
Frequently Asked Questions
What is the difference between a remortgage and a product transfer?
A product transfer keeps you with your existing lender on a new deal. A remortgage moves you to a different lender entirely.
A remortgage opens up the full market. A product transfer only gives you what your current lender offers.
Is a product transfer always cheaper than remortgaging?
No – a product transfer avoids fees but your existing lender’s internal rate can sit well above what the open market offers.
Add up the full five-year figure – rate plus all fees – before deciding. A lower rate with upfront charges often beats a fee-free deal at a higher rate.
When should I consider a remortgage over a product transfer?
When your existing lender’s rate is significantly above the market and the saving comfortably covers the switching fees.
On a £275,000 mortgage, a 0.50% rate gap typically saves over £3,000 net of fees across a five-year fix.
How early can I start a remortgage or product transfer?
Most lenders let you lock in a new rate up to six months before your current deal ends.
Starting early protects your rate, avoids landing on the standard variable rate, and gives you time to weigh up both routes properly. For a full breakdown of when starting early makes sense, see our page on when remortgaging early works.
Will remortgaging affect my credit score?
A remortgage application involves a hard credit search which temporarily affects your score.
A product transfer often involves a lighter credit check or none at all. If your credit profile has changed since your original mortgage, that’s worth factoring into which route you take.
What fees are involved in remortgaging?
The main costs are an arrangement fee (typically £500-£999) and legal fees (typically £200-£500).
Some lenders include fee-free deals or cashback to cover legal costs. Always add up the five-year total – rates and fees combined – not the headline rate alone.
Can I remortgage if my finances have changed since I took out the mortgage?
Yes – but the new lender will run a full affordability assessment based on your current income and outgoings.
If your position has weakened, a product transfer with your existing lender may be easier to secure. If it has strengthened, remortgaging may unlock better rates.
Find Out If Switching Lender Could Save You Money
Your fixed rate end date is the most important number on your mortgage. Whether a product transfer or a remortgage gives you the better outcome depends on your rate gap, your loan size, and what fees are in play – and the answer is different for every borrower.
UK Mortgage Broker is a whole-of-market mortgage broker working with homeowners across the UK. We compare product transfer rates from your existing lender against the full remortgage market and give you the true cost difference – including all fees – before you commit to either route.
Call: +44 1628 969 500
Email: [email protected]
UK Mortgage Broker is directly authorised and regulated by the Financial Conduct Authority. Your home may be repossessed if you do not keep up repayments on your mortgage.