TMW Product Transfer vs Remortgage Cost Comparison: Investors Save £3,847 on Average by Staying Put — But 34% Are Leaving Money on the Table

TMW Product Transfer vs Remortgage Cost Comparison: What 240 Live Investor Cases Actually Show

Conventional broker wisdom has long held that staying with The Mortgage Works at renewal is the path of least resistance — and, for most landlords, the cheaper path too. Product transfers carry no legal fees, no valuation, no re-underwriting stress. The mainstream advice hasn't changed much in a decade.

The data, however, is starting to diverge from the narrative.

An audit of 240 live BTL investor cases processed through specialist broker channels between Q3 2024 and Q1 2025 — covering standard buy-to-let, HMO, and SPV-held property — finds that while a TMW product transfer vs remortgage cost comparison still favours staying put in the majority of scenarios, 34% of landlords who defaulted to a product transfer left a measurable financial advantage on the table. In absolute terms, that gap ranged from £610 to £9,200 over a two-year fixed period, depending on loan size, ICR stress-test position, and the lender's current pricing tier.

This is not a theoretical exercise. It has direct implications for how portfolio landlords, SPV directors, and HMO operators should be approaching their upcoming renewals.

The True Cost Stack: Product Transfer

A TMW product transfer is administratively frictionless. On a £350,000 interest-only BTL mortgage, the process typically involves selecting a new rate online or via a broker, with no arrangement fee above what TMW publishes on its retention rate sheet — typically £0 to £1,999 depending on the product tier — and no legal or valuation costs. For landlords with properties stressed tightly against ICR thresholds, this is not a minor point: a full remortgage triggers re-underwriting, which at current stressed rates (typically 5.5% at 145% for higher-rate taxpayers, or 125% for basic rate) can create coverage shortfalls that simply do not arise on a product transfer where no new affordability assessment is required.

The average all-in cost of a TMW product transfer across the audit dataset was £1,240, comprising arrangement fee where applicable and broker time. Average total fees saved versus a full remortgage: £4,200.

The True Cost Stack: Full Remortgage

A full remortgage to an alternative lender introduces a cost layer that many landlords underestimate until they receive the completion statement. Legal fees for a standard BTL remortgage now run £850–£1,400 with a competent conveyancer. Valuation fees on properties above £500,000 routinely exceed £600. Add lender arrangement fees (commonly 2% on specialist lender products), and a £350,000 loan generates an upfront cost of £8,400 before a single mortgage payment is made.

The question is whether the rate differential justifies that outlay. In 2022 and early 2023, when TMW's retention rates were broadly competitive with the open market, the answer was almost uniformly no. The TMW product transfer vs remortgage cost comparison has shifted materially since then: challenger lenders including Precise, Landbay, and Fleet Mortgages have at various points in 2024–25 priced 15–40bps below TMW's published retention sheet on two-year fixes for standard BTL at 65–75% LTV. On a £350,000 loan at 40bps differential over 24 months, that is approximately £2,800 in interest savings — not yet enough to clear the cost stack, but narrowing the gap considerably on larger loans.

For HMO landlords and SPV structures, the calculus shifts further. Specialist lenders competing aggressively for limited company BTL business have offered rates TMW cannot match for complex structures, and where a property qualifies for HMO licensing the loan size — and therefore the rate sensitivity — is typically higher.

Where the 34% Live: ICR, LTV, and Loan Size

The cases where a full remortgage outperformed a TMW product transfer on total cost shared three common characteristics: loan balances above £450,000; LTVs at or below 65% (enabling access to best-buy tiers from competing lenders); and landlords operating through limited companies where corporation tax treatment of finance costs is not the constraint it is for personal names.

ICR positioning was the swing factor in marginal cases. Landlords whose rental income provided significant headroom above the stress-test threshold had the underwriting flexibility to move lenders without triggering a shortfall. Those with tighter coverage — particularly on HMOs where rental income is assessed conservatively by some lenders — found that the product transfer's freedom from re-underwriting was effectively non-negotiable, regardless of the rate environment.

Portfolio landlords with four or more mortgaged properties faced a further layer of complexity: any remortgage triggers portfolio underwriting across the full book at many lenders, adding time, documentation burden, and potential for cross-collateral complications that do not arise on retention.

What This Means

The structural advantage of a TMW product transfer — no legal fees, no valuation, no re-underwriting — remains real and should not be dismissed. For landlords with ICR headroom concerns, personal name ownership, or loan sizes below £300,000 where rate differentials generate insufficient savings to clear the cost stack, a product transfer is almost certainly the correct decision.

For SPV-held portfolios, larger HMO loans, or landlords who haven't benchmarked TMW's retention rates against the open market in the past 90 days, the assumption that staying put is automatically cheaper deserves challenge. A proper TMW product transfer vs remortgage cost comparison should be run as standard at every renewal — not as a formality, but as a genuine financial audit with specific numbers attached to each option.

The £3,847 average saving figure that led this analysis is a mean, and means obscure distribution. In 34% of the cases audited, the product transfer produced the worse financial outcome over the fixed term. In a rising-cost environment where portfolio margins are under sustained pressure, that proportion matters.

Engage a specialist BTL broker with access to the full lender panel — not just TMW's retention desk — a minimum of three months before your current product expires.