The 2026 market is not falling, but it is soft, and the gap between what sellers ask and what properties achieve has widened. That gap is exactly where down-valuations come from — and a down-valuation is the commonest way an agreed purchase comes unstuck at mortgage stage.
Where prices actually are
The indices diverge, as they always do, because they measure different things:
- Lloyds House Price Index (formerly Halifax): average around £298,000 in September 2026, with annual growth easing to roughly 1.3%.
- Nationwide: average nearer £278,500.
- Rightmove, which measures asking prices rather than achieved ones: an average of £364,999 for newly listed property in August 2026, down 2.0% on the month — the largest August fall since 2018 — with the full-year forecast revised to between 0% and −2%.
Achieved-price measures are broadly flat; asking prices are coming down. That is the definition of a market where sellers are ahead of buyers, and valuers work from achieved evidence.
Meanwhile the Bank of England base rate has been held at 3.75% since December 2025, with average two- and five-year fixed rates in the mid-5% range through September.
How a down-valuation actually works
The lender advances a percentage of the lower of purchase price and valuation. If you agree £300,000 and the valuer says £285,000, your 90% loan is 90% of £285,000 — £256,500, not £270,000. You still owe the seller £300,000, so the £13,500 difference has to come from you.
The second effect is the one people miss. Your deposit of £30,000 against a £285,000 valuation is 10.5% — so on the valuation figure you are borrowing 89.5%, and if you make up the shortfall you are borrowing £256,500 against £285,000, which is still 90%. Push the numbers slightly further and you cross into the 95% band, where pricing steps up materially. A 5% valuation shortfall can cost you considerably more than 5%.
What to do when it happens
Renegotiate. The strongest position you will ever have. The valuation is independent evidence that the price is above market, and the seller’s next buyer will very likely face the same report.
Increase the deposit. Works if you have the cash, but check what it does to your LTV band before assuming it is the cheapest fix.
Challenge the valuation. Lenders will consider a formal appeal, but only on evidence: three or more genuinely comparable sold prices, same street or immediate area, similar type, size and condition, within the last three to six months. Asking prices are not evidence. Your broker submits it; success rates are modest but it costs little to try.
Change lender. Different lenders use different panels and different valuers, and a second opinion sometimes comes in differently. It costs you a new application and two to three weeks, so it is a considered move rather than a reflex.
Where down-valuations cluster
- New build. The premium on a new home is real but is not always supported by comparable evidence, and incentives such as paid stamp duty or cashback are deducted from the valuation figure by most lenders.
- Refurbished property marketed at a big uplift shortly after purchase, where the six-month rule may also apply.
- Unique or rural property with thin comparable evidence.
- Areas with wide quality variation in the same street — common in terraced regional stock.
- Rising-market pricing in a flat market — sellers anchored to 2022 values.
Valuation types and what triggers which
Low-LTV, mainstream property often gets an automated valuation — instant, and no surveyor forms a view at all. Mid-range cases get a desktop assessment. Anything higher-LTV, non-standard, unusual or high-value gets a physical inspection, which takes one to two weeks and is where nearly all down-valuations originate.
If you are buying something a computer will not understand, expect a physical valuation and build the time into your offer.
The practical position for a 2026 buyer
Offer on evidence, not on the asking price. Ask the agent for the sold comparables that support the figure before you commit. Keep a margin in your deposit rather than stretching to the last pound, because a modest shortfall is survivable and a maximum-stretch purchase is not. And get an agreement in principle that reflects your real position, so that if the valuation does come in low you have room to respond rather than starting again.
Concerned a property may not value up? Talk to us before you offer — it is a much cheaper conversation at that stage.
Related services
YOUR HOME MAY BE REPOSSESSED IF YOU DO NOT KEEP UP REPAYMENTS ON YOUR MORTGAGE. Giles Finance is authorised by the Financial Conduct Authority (No. 726857) to transact regulated mortgages. Giles Finance is a trading style of Giles Finance & Consultancy Services. This article is general information, not advice; the right answer depends on your circumstances.