Factual and Procedural Background
A mature plane tree owned and managed by the Appellant was growing on a public footpath approximately four metres from a large residential development (“The Property”). During a severe drought in 1989, roots from the tree desiccated the London clay sub-soil beneath several blocks of the building, causing structural cracking. At that time the freehold reversion was held by Company B. On 25 June 1990 the freehold was transferred to the Respondent.
Engineering and architectural reports commissioned both before and after the transfer confirmed tree-root induced subsidence. Despite being shown the reports in August 1990, the Appellant did not remove the tree. Limited root-pruning was agreed in January 1991, but expert advice indicated that substantial underpinning was still required. Between January and July 1992 the Respondent carried out underpinning and piling works costing approximately £570,000, a figure the Appellant accepted as reasonable if liability existed.
The Respondent sued in nuisance. The trial judge dismissed the claim on the ground that all damage pre-dated the Respondent’s ownership. The Court of Appeal reversed the decision, finding a continuing nuisance and awarding the full remediation costs. The Appellant appealed to the House of Lords, which delivered the instant judgment.
Legal Issues Presented
- Whether encroachment by tree roots that commenced before the current owner acquired the land constitutes a continuing nuisance for which the current owner can recover remedial expenditure.
- Whether the owner of the tree is liable for remediation costs only after receiving notice and a reasonable opportunity to abate the nuisance.
- Whether the measure of damages can include reasonable works both to repair existing damage and to guard against future harm caused by the same continuing nuisance.
Arguments of the Parties
Appellant's Arguments
- All structural damage occurred before the Respondent obtained title; therefore only the prior owner (Company B) could sue.
- Any liability could arise only for new damage occurring after the transfer, which had not been proved.
- The tree-owner should not be saddled with extensive underpinning costs undertaken without first allowing the Appellant to abate the nuisance.
Respondent's Arguments
- The root activity caused a continuing nuisance that persisted into its period of ownership, entitling it to sue.
- The underpinning and piling were a reasonable method of abating the nuisance once the Appellant refused to remove the tree.
- Notice was given in August 1990, and the Appellant had ample opportunity to abate the nuisance before expensive works were undertaken.
Table of Precedents Cited
| Precedent |
Rule or Principle Cited For |
Application by the Court |
| Hunter v Canary Wharf Ltd [1997] AC 655 |
Identified available remedies for continuing nuisance |
Supported the view that an owner may recover reasonable costs to remove or abate a nuisance |
| Lemmon v Webb [1894] 3 Ch 1; [1895] AC 1 |
Right to abate encroaching branches and roots |
Illustrated the parallel between overhanging branches and root encroachment; not determinative on damages |
| Butler v Standard Telephones & Cables Ltd [1940] 1 KB 399 |
Liability for damage caused by root dehydration |
Cited as early authority confirming actionable nuisance from root encroachment |
| McCombe v Read [1955] 2 QB 429 |
Availability of injunction and damages for continuing root nuisance |
Reinforced that underpinning costs can, in principle, be recoverable |
| Davey v Harrow Corporation [1958] 1 QB 60 |
No distinction between planted and self-sown trees in establishing nuisance |
Affirmed tree-owner’s responsibility regardless of planting history |
| Morgan v Khyatt [1964] 1 WLR 475 (PC) |
Knowledge requirement for continuing nuisance liability |
Supported need for defendant’s actual or constructive knowledge |
| Masters v Brent LBC [1978] 1 QB 841 |
Current owner may recover loss arising from continuing nuisance predating ownership |
Court approved underlying rationale, distancing itself from the trial judge’s criticism |
| Solloway v Hampshire CC (1981) 79 LGR 449 |
Liability dependent on foreseeability and proportionality of remedial steps |
Used as caution against imposing unreasonable burdens, but distinguished on facts |
| Leakey v National Trust [1980] QB 485 |
Duty arises once danger is known or ought to be known |
Formed part of the knowledge-based approach adopted by the House |
| Sedleigh-Denfield v O'Callaghan [1940] AC 880 |
Failure to abate known nuisance constitutes continuing nuisance |
Key authority for requiring reasonable steps once knowledge exists |
| Overseas Tankship (Wagon Mound No. 2) [1967] 1 AC 617 |
Reasonable foreseeability governs liability in nuisance and negligence |
Emphasised foreseeability as central to deciding liability here |
| Goldman v Hargrave [1967] 1 AC 645 |
Standard of duty depends on what is reasonable in the defendant’s circumstances |
Supported the proportionality analysis for local authorities |
| Cambridge Water Co v Eastern Counties Leather [1994] 2 AC 264 |
Requirement of reasonable foreseeability even in strict-liability contexts |
Cited to reinforce foreseeability aspect |
| Whitehouse v Fellowes (1861) 10 CB(NS) 765 |
Continuing nuisance renews limitation periods |
Referenced but distinguished; not on remedial damages point |
| Darley Main Colliery Co v Mitchell (1886) 11 App Cas 127 |
Each fresh damage from continuing nuisance gives a new cause of action |
Illustrative of ongoing liability |
| West Leigh Colliery Co v Tunnicliffe & Hampson Ltd [1908] AC 27 |
Cannot recover once-and-for-all for future speculative loss |
Relied on to show no risk of double recovery arose here |
| Rylands v Fletcher (1868) LR 3 HL 330 (discussed via Cambridge Water) |
Strict liability tempered by foreseeability |
Not directly applied, but used to illustrate modern trend to foreseeability |
| Proprietors of Strata Plan No 14198 v Cowell (1989) 24 NSWLR 478 |
Importance of giving notice before incurring large remedial costs |
Foreign persuasive authority consistent with House’s approach |
| City of Richmond v Scantelbury [1991] 2 VR 38 |
Recovery of mitigation costs in nuisance |
Referenced as comparative support |
| Stratford Theater v Town of Stratford 140 Conn 422 (1953) |
Reasonable cost of self-help abatement is recoverable |
Cited from U.S. scholarship to confirm measure of damages |
Court's Reasoning and Analysis
The House held that the root activity constituted a continuing nuisance because the desiccation of the soil and impairment of load-bearing capacity persisted after the Respondent acquired title. Cracking in the superstructure was merely a manifestation of the underlying, ongoing interference with land.
Applying the principles of reasonable foreseeability and neighbourliness articulated in Sedleigh-Denfield, Wagon Mound No. 2, and Goldman v Hargrave, the Lords stated that liability arises once a tree-owner knows or ought to know of the hazard and has a reasonable opportunity to abate it. The Appellant had been notified in August 1990, declined to remove the tree, and therefore assumed responsibility for subsequent remedial costs.
The Court emphasised proportionality: while local authorities should not be subject to “unreasonable and unacceptable burdens” (Solloway), they may fairly be required to fund underpinning when they choose to retain a damaging tree after notice. Here, the trial judge had found—and the parties accepted—that underpinning and piling were reasonable and necessary despite earlier root-pruning.
Concerns about double recovery were dismissed; the prior owner had not paid for repairs, and depreciation damages were not available under West Leigh Colliery. Accordingly, allowing the Respondent to recover its actual, reasonable expenditure was consistent with both precedent and fairness.
Holding and Implications
APPEAL DISMISSED.
The House of Lords affirmed that a landowner suffering from a continuing nuisance may recover reasonable remedial costs even where some physical damage pre-dates its ownership, provided the defendant had knowledge and the chance to abate the nuisance. The decision clarifies the obligations of tree-owning authorities and neighbours, signalling that reasonable notice coupled with inaction will expose them to substantial remediation liabilities. No new cause of action was created, but the judgment provides authoritative guidance on damages and notice requirements in root-related nuisance cases.