Negligent valuation produced the original scope-of-duty rule in English law. South Australia Asset Management Corp v York Montague [1997] AC 191 (SAAMCO) was decided on lender claims against surveyors who had over-valued commercial property. Twenty-four years later the Supreme Court revisited the area in Manchester Building Society v Grant Thornton UK LLP [2021] UKSC 20, reframing the analysis around a counterfactual test. This entry sets out what that reframing means for valuer PI claims and whether the classic SAAMCO cap survives.
The starting point has always been the distinction between a duty to advise on whether to enter a transaction and a duty to provide information on which the lender then makes its own decision. Valuers almost always fall on the information side. Lord Hoffmann's illustration in SAAMCO was the mountaineer whose doctor negligently passed a knee as sound: the doctor was not liable for injuries caused by an avalanche during the climb.
Translated to lending, the courts asked two questions. First, would the lender have entered into some transaction at all if the valuation had been accurate — the classic no-transaction versus less-advantageous-transaction analysis worked through in Nykredit Mortgage Bank plc v Edward Erdman Group Ltd (No 2) [1997] 1 WLR 1627. Second, what proportion of the lender's loss was attributable to the valuation being wrong, as opposed to a general fall in the property market or borrower default risks the valuer never underwrote.
The consequence was the SAAMCO cap. A valuer providing information (not advice) is liable only for the loss attributable to the information being wrong — practically, the difference between the negligent valuation and the true value at the date of the valuation. The valuer is not on risk for wider market movement that then wiped out the balance of the lender's security. The cap survived robustly through Titan Europe 2006-3 plc v Colliers International UK plc (in liquidation) [2015] EWCA Civ 1083, where the Court of Appeal reiterated that only loss falling within the scope of the valuer's duty was recoverable.
In Manchester Building Society the Supreme Court moved away from the tight information/advice dichotomy and put the emphasis on the purpose for which the professional's duty was assumed and on a counterfactual test: what would have happened but for the negligence, and was the loss suffered within the scope of the risk the professional was engaged to protect the client against. The court was clear the reframing was not intended to overturn SAAMCO on its facts. Valuer cases remain the paradigm information case, and the cap principle survives.
What the reframing does is make the counterfactual explicit. The court asks what the lender would have done had a competent valuation been produced. If the lender would still have advanced money — just less of it — the recoverable loss is limited to the additional exposure taken on because of the negligent figure. If the lender would not have lent at all, the recoverable loss is broader, though still capped by the requirement that the loss be attributable to the information being wrong rather than to the market.
Worked example (illustrative only). A surveyor negligently values a commercial premises at £5m; the true value at the date of the report is £3m. The lending bank advances 70% loan-to-value, £3.5m. The borrower defaults during a property market downturn. On enforcement the bank realises £2m. Total loss to the bank is £1.5m.
The valuer's exposure at the outer limit is the £2m difference between the negligent figure and the true value. Within that ceiling, the court then looks at how much of the £1.5m actual loss is attributable to the information being wrong — approximately £1.5m subject to market-movement analysis stripping out post-transaction decline. The post-Manchester counterfactual then asks: would the bank have lent at all on a £3m valuation? If yes but at a lower advance, the cap pulls recovery down because the bank would still have been exposed to a portion of the market decline. If no lending would have happened at all, the recoverable figure is higher because none of the loss would have occurred but for the negligent report.
The practical burden the reframing places on lender claimants is the counterfactual itself. Contemporaneous credit-committee papers, lending policy at the date of the transaction, and internal loan-to-value thresholds are now central to proving what the bank would have done on a true valuation. Lenders who cannot show a clear internal policy trigger risk being pushed into the less-advantageous-transaction category and losing the fuller recovery a no-transaction finding would produce.
For surveyors, valuers, and the wider RICS-regulated population, the reframing is best read as a clarification rather than a rewrite. The SAAMCO cap survives for pure information cases, which is where the vast majority of valuer claims sit. Apex Insurance Brokers arranges PI cover for surveyors and valuers and works with clients on the claims-notification process where a lender pre-action letter has arrived. See the sector guide at /surveyors-pi-insurance-uk-guide-2026/, the general reframing note at /wiki/advice-vs-information-scope-of-duty-uk/, and the adjacent pillars at /solicitors-pi-insurance-uk-guide-2026/ and /accountants-pi-insurance-uk-guide-2026/.
Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority. Firm reference number 724952. This entry is general information, not advice on any particular policy.