Buy-to-Let Product Transfer or Remortgage: Compare the Whole Cost

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A product transfer means taking a new mortgage deal with your existing lender. A remortgage usually means replacing the loan with one from another lender. Both can be sensible when a buy-to-let deal ends, but a lower advertised rate does not settle the choice.

You need to compare the total cost over the same period, the work required and what happens if the transfer or remortgage is delayed. A slightly higher rate with little administration can beat a cheaper rate carrying substantial fees. A remortgage can also offer changes that a straightforward rate switch cannot.

What stays the same in a product transfer?

For a simple product transfer, the property and lender remain the same. You choose an eligible deal for the existing borrowing. The process is often shorter than a new-lender application because the lender already holds the mortgage and its legal charge.

That does not mean every borrower can switch without conditions. Arrears, account status, the existing product, where you live and the changes you request can matter. The exact eligibility rules belong to your lender.

For example, The Mortgage Works’ customer switching page explains its qualifying conditions and states that its online switch does not let you change the mortgage term or repayment method. A request for extra borrowing or a change of ownership needs a different discussion. Treat this as one lender’s process, checked on 19 October 2026.

What changes in a remortgage?

A new lender needs to accept you, the property and the proposed loan. Expect the application to address value, rent, credit history, ownership and relevant personal or company information. Legal work is normally needed to replace the lender’s charge, even if a product includes a legal incentive.

A remortgage may suit a landlord who wants to release equity, change the term or repayment method, or access lenders with a different approach to the property. It also exposes the case to current criteria. A loan that was accepted several years ago is not automatically acceptable to another lender today.

Coventry’s product-transfer and remortgaging helpsheet gives a useful starting comparison. For an actual decision, obtain illustrations for the same balance, repayment basis and comparison period.

A £150,000 comparison after fees

Assume a £150,000 interest-only mortgage and a two-year comparison. The product transfer has a 5.5% rate and a £500 fee. A remortgage has a 5.1% rate and £1,800 of total unavoidable switching costs after any incentives. These are invented illustrative offers, not available products.

The remortgage saves £50 a month in interest but starts with £1,300 more costs. It takes 26 months to recover that difference. Over this two-year comparison, the transfer costs £100 less. Over a different period, or with different fees, the result can change.

Use the mortgage stress calculator to compare payments at the proposed rates. Then add the relevant fees yourself. For repayment loans, include the balance remaining at the end of the comparison, because lower payments can reflect slower capital repayment.

The result is sensitive to the actual quotation. If total remortgage costs fell to £1,500, the extra cost against the £500 transfer would be £1,000. At the same £50 monthly interest saving, recovery would take 20 months and the remortgage would save £200 over 24 months. That is why a broker’s itemised figures are more useful than a rule that switching lender is always cheaper.

Which costs belong in the comparison?

Include product fees, broker charges, valuation costs, legal costs not covered by the offer, existing-lender exit charges and any early repayment charge. Check whether an incentive is cashback, standard legal work or a contribution that leaves some costs with you.

A leasehold property, company borrower or complicated title can generate additional legal work outside a basic package. Ask for a quotation based on your circumstances. “Free legals” in a headline is not an itemised promise covering every possible disbursement.

If a fee is added to the mortgage, the debt increases and interest may be charged on it. Do not compare a cash-paid fee on one option with an ignored loan-added fee on the other. The mortgage-fee comparison guide explains why a low rate can carry a high effective cost.

A delay can change a close result

Suppose the old deal ends before the new lender can complete. If the temporary reversion rate is 8% instead of a 5.5% transfer rate, an unchanged £150,000 interest-only balance costs £312.50 more for one month. That is a scenario, not a prediction about your lender’s reversion rate.

In a comparison separated by only £100, that extra month matters. Ask the broker for the likely timetable and identify what could delay the case: valuation access, company documents, an outstanding management pack or solicitors waiting for information.

Do not respond by accepting an unsuitable transfer in panic. Start early enough to compare both routes and understand the lender’s product-reservation and cancellation rules. The mortgage deal-ending checklist helps organise those dates.

What if the property no longer passes a new lender’s rent test?

A like-for-like transfer may be available under a lender’s existing-customer process even where a fresh remortgage would be difficult. That possibility can be valuable if the rent has not kept pace with stress rates or if the property has fallen in value.

But avoid the blanket claim that transfers never involve affordability checks. Eligibility and requested changes vary. Ask the current lender what it requires for your precise transaction, including whether an updated valuation or a different LTV band is relevant.

If the new lender offers a smaller loan, include the cash needed to reduce the mortgage. A £1,000 saving in fees means little if the remortgage requires £15,000 you cannot comfortably supply. Conversely, reducing debt may improve the wider plan if that is what you intended.

Decide what you want the mortgage to achieve

Make a short list before choosing a rate. Are you keeping the property for five years, considering a sale, planning major work or hoping to raise a deposit for another purchase? Early repayment terms can matter more than a small monthly difference if the property is likely to be sold.

For a portfolio, consider how the deal fits other expiries. A cheap individual mortgage can still leave several properties exposed to refinancing at the same time. Record the expected completion date, deal end, balance and any conditions alongside the headline rate.

The decision should be explainable in a sentence: this option costs this much over the period, gives these borrowing terms and suits this plan. If the explanation relies only on “the rate is lower”, the comparison is probably incomplete.

Where the property is owned jointly or by a company, confirm every required borrower or director can complete the process in time. One missing identity document or signature can alter a timetable that looked comfortable when only the rate was being compared.

Keep a written comparison

Save both mortgage illustrations and record the date the rates were checked. List which fees are refundable, which are payable before an offer and which are added to the borrowing. Keep the redemption figure from the existing lender separate from an estimated account balance.

That record also helps if rates change while an application is being processed. Ask the adviser whether the selected product can be replaced and what happens to any fee. Do not assume a new lower headline rate can be adopted without a formal change to the application or offer.

Questions about product transfers and remortgages