A key UK five-year fixed mortgage measure reached 4.98% in September 2026, its highest level in three years. Buyers are becoming more cautious, agreed sales remain weak and rental demand is growing. The result is a shift in housing-market conditions, rather than evidence of a nationwide property crash.

The 4.98% figure covers five-year fixed mortgages at 75% loan-to-value, not every mortgage product. The September RICS survey found buyer enquiries at a net balance of −22%, agreed sales at −18% and house price assessments at −32%. These are survey balances, not percentage falls in transactions or house values.

Mortgage affordability is deteriorating

Financing costs are again limiting household budgets. For a £350,000 property with a 25% deposit, a 25-year repayment mortgage of £262,500 costs roughly £1,314 per month at 3.5%, compared with £1,532 at 4.98%. The difference is more than £200 monthly before taxes, insurance and maintenance.

Actual rates differ by deposit size, loan structure and borrower profile. The 4.98% benchmark should not be presented as the national average across all products.

RICS indicators deteriorated in September

The buyer enquiries balance slipped from −18% in August to −22% in September. Agreed sales moved from −16% to −18%, while the house price balance worsened from −28% to −32%. However, buyer demand had reached −41% in March, so September signals renewed weakening, not an unprecedented low.

Listings rise as buyers hesitate

New sales instructions returned to positive territory at +6%, the first positive reading since mid-2025. More listings combined with weak demand may improve buyer negotiating power, although many sellers can delay their move rather than accept a lower price.

London remained weaker than the national house price balance. Northern Ireland showed continuing gains and Scotland modest growth, underscoring the limits of a single UK-wide measure.

Rental demand is moving the other way

Tenant demand rose for a third consecutive month, reaching a +23% net balance in the RICS survey. Landlord instructions remained negative. Expectations for rent increases over the coming three months stood at +37%, below August's +44% but still elevated.

The +23% and +37% figures are not actual rent increases. They are survey balances showing the direction of market activity and professional expectations.

What changes for investors

Strong tenant demand does not guarantee better net rental yields. Landlords also face financing, maintenance, tax, insurance, service charges, vacancies and management costs. A £300,000 property generating £18,000 in annual rent offers a 6% gross yield, but its net return may be substantially lower.

A seller discount can be offset by more expensive borrowing. Investors using cash are less exposed to refinancing, but remain vulnerable to property-level risks and weak resale demand.

Why London is particularly exposed

High home prices make the capital sensitive to mortgage affordability. Some flats also carry significant service charges, leasehold restrictions or major building works. Buying on a lower asking price alone can conceal high lifetime ownership costs.

International Investment has separately reported on London flats resold below their previous purchase price after five to ten years of ownership. Rising mortgage costs can add to pressure but do not explain every such loss.

Outlook: pressure, not a confirmed collapse

RICS recorded a −24% balance for three-month house price expectations and a neutral balance for the next 12 months. That suggests near-term weakness, but not a consensus for a nationwide crash.

The crucial change is different for each group: buyers face expensive credit, tenants face constrained rental supply, and investors must calculate net yields rather than assume rent growth translates directly into profit.

FAQ

What are UK mortgage rates in October 2026?

The Financial Times reports a September average of 4.98% for a five-year fix at 75% loan-to-value. Other products carry different rates.

Are UK property prices falling?

The RICS September house price net balance was −32%. This is a survey signal, not a 32% change in actual prices.

Are housing sales declining?

The agreed sales net balance worsened from −16% to −18% in September, indicating subdued transaction activity.

Why is rental demand increasing?

Higher borrowing costs can keep would-be buyers in rented accommodation while landlord supply remains constrained.

Is UK buy-to-let still attractive?

Returns depend on price, financing, taxes, maintenance and achievable rent. Higher asking rents alone do not guarantee stronger profits.