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A net balance of -36% of surveyors reported falling house prices in October 2026, and London is one of the regions where price trends are weaker than the national average [1]. For anyone selling, buying, extending a lease or dividing assets in Notting Hill, Kensington and Chelsea or the wider west London market, that is the backdrop against which lenders' valuers are now making decisions. This article uses the RICS survey, published on 12 November 2026, only as the starting point. Its subject is the down valuation London expert valuation evidence question: what a down valuation is, how to challenge one, and when an independent Red Book valuation or an expert valuer's report is the right tool.
Key Takeaways
- The RICS October 2026 survey shows the weakest twelve-month sales expectations since July 2023, with London among the regions where prices are weakening fastest [1][2].
- Brokers reported down valuations of 10% to almost a third of value earlier in 2026; a down valuation can be challenged with comparable evidence, a lender appeal and an independent RICS Red Book valuation [3].
- In negligence claims, Bratt v Jones (2025) EWCA Civ 562 confirms that a valuation must fall outside an acceptable margin of error before liability can arise, and that margin is decided on expert evidence [4].
- Expert valuation evidence in court must comply with CPR Part 35, and the RICS standard for surveyors acting as expert witnesses, 5th edition, takes effect on 30 November 2026 [5][6].
What the RICS October 2026 Survey Says
The RICS UK Residential Market Survey is a monthly sentiment index reporting net balances: the percentage of surveyors seeing a rise minus the percentage seeing a fall. The October 2026 edition paints a subdued picture [1][2].
Separate estimates point to an expected price decline of about 1% over the coming year. London, East Anglia, the West Midlands and the South East showed weaker price trends than the national average, while Northern Ireland, Scotland and the North West saw growth [1].
Tarrant Parsons, head of market research and analysis at RICS, said: "Home buyer demand remains subdued, and respondents are bracing for a weaker year ahead for sales." [1]
Jeremy Leaf, a north London estate agent and former RICS residential chairman, pointed to "the lack of near-term expectation of improvement" and noted that some sellers are becoming more realistic [1]. Tomer Aboody of MT Finance observed that "buyers who are able to afford the higher mortgage payments could find themselves in a strong position to negotiate" [1]. The rest of this article is about what those conditions mean for valuations.
Why a Weaker Market Produces More Down Valuations
A down valuation occurs when the valuer acting for a mortgage lender reports a market value lower than the price the buyer has agreed to pay. The lender then bases its loan on the lower figure. The buyer must find the shortfall, renegotiate or walk away.
In July 2026, Sky News reported brokers seeing down valuations at an unfamiliar scale. Jamie Elvin, director of Strive Mortgages, described cuts of 10%, 20% and 30% of a property's value and said: "I've seen periods of down valuations before, but not really to this scale." One broker reported up to £400,000 knocked off valuations within a fortnight [3].
The brokers quoted attributed the pattern to valuers taking a defensive stance while buyers and sellers continued to price homes on earlier, stronger conditions [3]. The October 2026 RICS data suggests that gap has not closed. In Notting Hill and Kensington and Chelsea, where houses and flats differ sharply in condition, lease length and tenure, comparable evidence is thin even in a strong market. In a soft one, the risk that the valuer's figure and the agreed price diverge increases.
Down Valuation London Expert Valuation Evidence: How to Challenge a Low Figure
A down valuation is an opinion, not a verdict. It can be questioned. The steps below are general; the exact process depends on the lender.
1. Gather better comparable evidence
The strongest challenge is recent sold prices for similar properties nearby. Asking prices carry little weight. Sold prices registered with HM Land Registry, ideally within the last six months and in the same street or immediate area, are what a valuer will consider, adjusted for lease length, floor level, outside space and condition.
2. Use the lender's appeal process
Most lenders allow an appeal, submitted by the broker with the supporting comparables. The outcome is not guaranteed.
3. Obtain an independent RICS Red Book valuation
An independent valuation by an RICS Registered Valuer under RICS Valuation, Global Standards (the Red Book) gives a fully reasoned opinion of market value, with the basis of value, assumptions and comparable evidence set out [7]. It does not bind the lender, but it is persuasive in renegotiation and is the document needed if the dispute goes further. Notting Hill Surveyors provides RICS Red Book valuations across Notting Hill, Kensington and Chelsea and west London.
Valuation Disputes Beyond the Mortgage
Falling prices expose other valuation disagreements that were hidden when values were rising.
Sales and renegotiation. A seller armed with an independent valuation is better placed to hold or justify the price when a buyer uses a down valuation to renegotiate.
Lease extensions. Premiums for statutory lease extensions in west London mansion blocks depend on valuation assumptions that a softer market changes. Disagreements between the leaseholder's and freeholder's valuers often end before the First-tier Tribunal (Property Chamber), where each side's evidence is tested.
Probate. Inheritance tax valuations must reflect market value at the date of death. An executor relying on an estate agent's appraisal rather than a Red Book valuation risks overpaying tax or a challenge from HM Revenue and Customs.
Matrimonial disputes. Family proceedings routinely require a single joint expert valuer, and when prices are moving the valuation date becomes the point of argument.
In each case, the quality of the valuation evidence decides the outcome.
Down Valuation London Expert Valuation Evidence in Negligence Claims
When a valuation is alleged to be wrong, the question is whether the valuer was negligent. The Court of Appeal's decision in Bratt v Jones (2025) EWCA Civ 562, handed down on 2 May 2025, sets out the current law [4].
The case concerned an Oxfordshire development site valued by Mr Jones at £4.075 million; the owner argued it was worth around £8 million. The trial judge found the most likely value was about £4.75 million, applied a 15% margin of error and dismissed the claim because the valuation fell within it. The Court of Appeal dismissed the appeal [4]. Three points matter for anyone considering a claim:
- The bracket is a precondition. A valuation outside the acceptable margin of error is a necessary first step before liability can arise. If the figure is inside the bracket, the court does not need to examine the valuer's method [4].
- The margin is a question of fact. The width of the bracket, whether 5%, 10%, 15% or more, depends on the type of property and is decided on the expert evidence before the court. In Bratt v Jones the claimant's expert gave no opinion on the reasonable range, and that omission was decisive [4].
- Specific failings must be pleaded and proved. Even outside the bracket, the claimant must show what the valuer did wrong, measured against the standard of a reasonably competent valuer under the Bolam test. The burden stays with the claimant throughout [4].
A down valuation is therefore not negligent simply because another valuer disagrees. A claim needs expert valuation evidence that addresses both the bracket and the method.
Expert Valuation Evidence: What the Court Expects
Expert valuers in civil proceedings are governed by CPR Part 35 and its Practice Direction [5]:
- Overriding duty to the court. Under CPR 35.3 the expert's duty to help the court overrides any obligation to the person instructing or paying them.
- Form of the report. Practice Direction 35 requires the expert's qualifications, the material relied on, the substance of all instructions, the range of opinion where it exists and a statement of truth.
- Single joint experts. Under CPR 35.7 the court may direct that evidence be given by one expert jointly instructed by the parties, which is common in matrimonial and lower-value disputes.
- Discussions and joint statements. Under CPR 35.12 experts can be directed to meet and produce a joint statement of what is agreed and what is not.
Surveyors also have professional obligations. The RICS standard "Surveyors acting as expert witnesses", 5th edition, published in July 2026, takes effect on 30 November 2026 [6]. A valuation report commissioned for a dispute should therefore be prepared by an RICS Registered Valuer who understands both the Red Book and Part 35. A report that works for a lender appeal may not be adequate for a tribunal or court.
Conclusion
The RICS October 2026 survey confirms that London is now a weaker market than the national average [1]. For Notting Hill and west London owners, that means more down valuations and more valuation disputes across sales, lease extensions, probate and family matters.
The response is the same in each case: get the right valuation evidence early. Challenge a down valuation with sold comparables and the lender's appeal process, commission an independent Red Book valuation where the sum at stake justifies it, and if a dispute is heading to a tribunal or court, instruct a valuer who can act as an expert witness under CPR Part 35 and the new RICS standard from 30 November 2026.
This article is general information and not legal or financial advice. Anyone facing a valuation dispute should take advice from a solicitor and an RICS Registered Valuer on their own circumstances.
References
- Housing Sales Outlook Falls to Weakest Level Since 2023 Rics. theintermediary.co.uk.
- UK Surveyors Face Weakest Housing Market Since 2023 Rics Says. bloomberg.com.
- Down Valuation Phenomenon Happening Scale 122500752. uk.finance.yahoo.com.
- Civ. caselaw.nationalarchives.gov.uk.
- Part35. justice.gov.uk.
- Surveyors Acting as Expert Witnesses. rics.org.
- Red Book. rics.org.