Mortgage rates slip, but London landlords still face a tougher remortgage market than the averages suggest

A five-week run of rising average mortgage rates has ended, but the latest dip is too small to change the picture for most landlords on its own.

Moneyfacts data reported by Mortgage Strategy on 14 August 2026 showed the average two-year fixed rate easing from 5.63% to 5.61% and the average five-year fixed rate from 5.67% to 5.64%. That is a real move, but not evidence that borrowing is broadly getting cheaper.

The detail matters more than the average. In the same update, an average three-year fixed at 70% LTV fell by 25 basis points to 5.69%, while an average ten-year fixed at 95% LTV dropped by 9 basis points to 6.16%. But lender pricing is still moving both ways: NatWest, Lloyds, Santander, Halifax, Coventry, HSBC and Atom cut selected products, while Metro Bank, Progressive and Kensington increased some rates.

For landlords, that means one thing: do not assume last week’s illustration still stands, and do not assume a cheaper product for a vanilla buy-to-let will translate to an HMO, limited-company case, ex-local authority flat or interest-only remortgage.

Why the average fall may make little difference

A 2 basis point move sounds positive, but for many London landlords it will not transform affordability or cashflow. On a £400,000 interest-only mortgage, a fall from 5.63% to 5.61% cuts annual interest by roughly £80. By contrast, a 25 basis point lender repricing is worth about £1,000 a year on the same balance.

That is the practical distinction landlords need to keep in mind this autumn: the headline average may improve, while the deal that actually fits the property, rental stress test and ownership structure does not.

The immediate risk is timing, not regulation

There is no new law behind this week’s move. The operational issue is product timing. The same reporting cited Aldermore product withdrawals, Principality extending some end dates to 30 November 2026, and new longer-term fixes from Bank of Ireland and The Co-operative Bank.

If a mortgage ends in the next 6 to 24 months, landlords should be asking for fresh illustrations now and checking booking deadlines, valuation requirements and fees in writing. Leaving it late can shrink the lender pool and increase the chance of falling onto a standard variable rate.

Agents must not stray into regulated mortgage advice

Letting agents discussing finance with landlords need to stay inside FCA boundaries. Unless authorised, they should not recommend a specific lender, product, fixed term or borrowing structure.

The compliant approach is factual signposting: explain that rates and criteria have changed, then refer the landlord to an FCA-authorised broker or adviser. That referral should be recorded on file, especially where the discussion touches on whether to fix, refinance, borrow more or move borrowing into a company structure.

Check mortgage terms before changing the way a property is let

A cheaper rate is irrelevant if the intended use breaches the mortgage terms. Before advertising or approving an HMO conversion, holiday let, company let or lodger arrangement, landlords should confirm that the existing lender permits it and that any remortgage product will do the same.

This is where deals often fail late in the process. A property may look stronger on yield after a change of use, but still fall outside lender policy on licensing, permitted occupancy, lease terms or building type.

Interest-only borrowers should stress-test now

The latest update also noted that some lenders raised selected products even as broader averages eased. That matters most for interest-only and part-and-part borrowers with tighter rental cover.

If a refinance only works at today’s headline rate, it may not work at the rate actually offered after valuation, underwriting or a lender policy change. Landlords with higher leverage should model a less favourable outcome now rather than rely on the average market move.

Three actions for landlords before autumn remortgages

First, by the end of August 2026, prepare a property-by-property remortgage schedule covering every fixed rate ending in the next 24 months, including lender, balance, repayment type, early repayment charge date and any proposed change of use.

Second, within 14 days, obtain updated illustrations for any property that is an HMO, limited-company holding, interest-only loan, ex-local authority flat or other non-standard case.

Third, before marketing any new letting arrangement, check the mortgage conditions and obtain lender consent in writing where required.

For a London landlord, the latest rate dip is a prompt to review finance early, not a signal that the remortgage market has suddenly become easy.

Rentals & Sales can help you audit upcoming mortgage expiries across your portfolio and flag where property type or proposed use should be checked with an FCA-authorised broker before you remarket.