Real property, real impact: the Chartbrook principle

Article by Julian Greenhill KC and Daniel Petrides,  20th April 2026.

This article was first published by Estates Gazette here.

There can be few questions in property law more fundamental than what your contract means. There are also few questions which have created a more contentious body of judicial reasoning at the highest level over an extended period of time, none more so than Chartbrook v Persimmon Homes [2009] UKHL 38; [2009] 3 EGLR 119.

Literal vs Purposive

Interpreting a contract ought to be a simple exercise. The parties (usually with assistance from their lawyers) will have reduced their agreement – whether that be a lease, a conveyance, an option, an overage agreement or some other instrument – to a series of words contained in a written document. Those words will, as a matter of vocabulary, syntax and grammar, have a “natural and ordinary meaning” which would be obvious to any fluent English speaker. If a dispute were to break out about a particular provision, the court’s task would therefore be limited to ascertaining and giving effect to that natural and ordinary meaning.

For much of the 20th century, a version of this type of “literalism” prevailed (although not as absolutely as is sometimes suggested). As a corollary to English law’s “objective” approach to the law of contract, courts would be slow to give weight to (or even consider) extraneous materials, instead focusing just on the language contained within the four corners of the agreement. This was said to promote certainty, minimise the evidential burden in such disputes, and avoid the risk of the court remaking the bargain to the detriment of one or other party.

Occasionally, the equitable doctrine of rectification may have allowed the court to correct a mistake in the language used in the contract; but this was distinct from the process of interpretation, and the bar for it to operate was high (requiring “convincing proof” of a continuing common intention of all parties that the contract should say something different).

However, shortly beforethe millennium, the judicial sands began to shift. In a series of decisions – notably Mannai Investment Co Ltd v Eagle Star Assurance Co Ltd [1997] AC 749; [1997] PLSCS 15 and Investors Compensation Scheme v West Bromwich Building Society [1998] 1 WLR 896, Lord Hoffmann gave trenchant support to a more contextual and purposive approach by which the court could look beyond the words in the contract to “absolutely anything which would have affected the way in which the language of the document would have been understood by a reasonable man” (ICS), even if this meant giving the language a less natural, or even entirely unnatural, meaning. With hindsight, Chartbrook (Lord Hoffmann’s final appeal) can be seen as
the high watermark of this approach.

The Decision in Chartbrook

The facts of Chartbrook can be stated simply. Chartbrook owned the freehold of a development site in South London, which it sold to Persimmon on terms that Persimmon would pay an initial base price to Chartbrook together with an “Additional Residential Payment” in accordance with a contractual formula once the re-development was complete. After the development was completed, a difference of opinion arose about the meaning of the formula: Persimmon contended that the formula required it to pay about £900,000; Chartbrook contended that the true figure was closer to £4.5m.

The difficulty which Persimmon faced was twofold. First, the language of the formula clearly supported Chartbrook’s interpretation. Second, while it was clear from a pre-contractual exchange of letters that the parties had agreed an overage payment only of the much lower sum contended for by Persimmon (in the Court of Appeal Lawrence Collins LJ had remarked that, if they were admissible, the pre-contractual materials would have been determinative on the construction issue) the evidence of Chartbrook’s directors – which had been accepted at first instance, and against which no appeal lay – was that they had always subjectively believed that the formula would entitle them to the higher figure, thus barring any claim for rectification on the basis of a common subjective intention. As a result, Chartbrook won at first instance and in the Court of Appeal.

Despite this, Persimmon succeeded in the in the House of Lords. Lord Hoffmann’s starting point was that “to interpret the definition of ARP in accordance with ordinary rules of syntax makes no commercial sense”.  It was not revolutionary to suggest that some recourse could be had to commercial common sense in certain cases. But Lord Hoffmann’s solution in Chartbrook was to push this principle further than ever before to create what has become known as “the Chartbrook principle”.

Relying on the earlier case of East v Pantiles (Plant Hire) Ltd [1982] 2 EGLR 111, he held that where there is a clear mistake on the face of an instrument, and where it is clear what correction ought to be made in order to cure that mistake, the court can correct a mistake as part of the process of construction. In doing so he took a principle originally established for the correction of obvious clerical errors and refashioned it as a tool for purposively interpreting the disputed formula in Chartbrook. Most novel of all, he said “there is not, so to speak, a limit to the
amount of red ink or verbal rearrangement or correction which the court is allowed”.

That was sufficient to dispose of the appeal in Persimmon’s favour. However, Lord Hoffmann went on to address two further lines of argument which had been advanced by Persimmon in an effort to overcome the difficulties it faced. First, Persimmon had invited the House of Lords to depart from the longstanding rule that evidence of pre-contractual negotiations is inadmissible when construing a contract. Indeed the case only reached the House of Lords on the basis of the “general public importance” of Persimmon’s principled challenge to this rule. In the event, that invitation was refused for essentially pragmatic reasons.

Second, Persimmon had also argued in the alternative that the contract should be rectified, and invited the House of Lords to adopt the so-called “objective theory of rectification”, by which the search for a continuing common intention is not a search for what the parties subjectively understood their contract to mean, but rather for an objectively ascertainable “prior consensus”.

In obiter comments with which the other Lords of Appeal unanimously agreed, Lord Hoffmann accepted Persimmon’s argument on rectification and said that rectification should be available if the written contract varies from “what an objective observer would have thought the intentions of the parties to be”.

Following in the Wake

Attempts to rely on pre-contractual negotiations in aid of interpretation continued but (as Lord Clarke recognised in Oceanbulk Shipping v TMT Asia [2010] UKSC 44) the battleground has shifted towards attempts to rely on such material as evidence of the “matrix of fact”. Meanwhile, the objective theory of rectification has proven to be a blind alley. In FSHC Group Holdings Ltd v Glas Trust Corp Ltd [2019] EWCA Civ 1361, the Court of Appeal held that Lord Hoffmann’s obiter dictum should no longer be followed in cases where there is no prior agreement between the parties, reinstating the traditional subjective approach.

At a conceptual level, Lord Neuberger’s judgment in Arnold v Britton [2015] UKSC 36; [2015] EGLR 53 – upholding the literal meaning of a service charge escalator in the lease of a holiday chalet with the result that the amount payable would rise from £90 at the lease’s inception to £550,000 by 2072 – was seen as a re-trenchment of literalism. (Two years earlier, in Cherry Tree Investments Ltd v Landmain Ltd [2012] EWCA Civ 736; [2012] 2 EGLR 141, the Court of Appeal had doubted the appropriateness of contextual interpretation when construing documents registered at HM Land Registry on which third parties might rely).

More recently in Wood v Capita Insurance Services Ltd [2017] UKSC 24, Lord Hodge (with thinly veiled frustration at the frequency with which the apex court was being asked for guidance on these issues) attempted to harmonise the rival schools, declaring that “textualism and contextualism are not conflicting paradigms in a battle for exclusive occupation of the field”. And a few years later in Monsolar IQ Ltd v Woden Park Ltd [2021] EWCA Civ 961; [2021] EGLR 35 the Chartbrook principle itself survived an attack, with Nugee LJ (who had been the leading counsel for Persimmon in Chartbrook) rejecting an argument that cases such as Arnold had dramatically limited its scope, but emphasising that it would likely require the literal meaning to be absurd, rather than merely commercially unattractive, for it to apply.

The upshot is that courts now have the flexibility to give greater or lesser weight to the natural and ordinary meaning of the words depending on the circumstances of each case. The line of authorities which culminated in Chartbrook, if no longer the final word on interpretation, at least succeeded in adding contextualism to the judicial toolbox.