Petropulos and Another v Dias (1055/2018) [2020] ZASCA 53; [2020] 3 All SA 358 (SCA); 2020 (5) SA 63 (SCA) (21 May 2020)

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Case summary written by Phumzile Rabula

6 April 2021

Background and Summary

Ms Petropulos (the appellant) and Mr Dias (the respondent) owned adjoining properties in Camps Bay, Cape Town. The properties were located on a steeply sloped mountainside. In March 2008, Ms Petropulos commenced excavations on her property, near the boundary of Mr Dias’ property, in order to undertake renovations. The excavation by the appellant was in preparation for building a house, whilst Mr Venter’s was for building an additional garage, which had minimal to no effect on the land. The excavation on the appellant’s property was substantial as they were building three levels and a lift shaft. To provide lateral support, the levels were secured by a retaining wall.

During 2008, there was major movement beneath the ground which resulted in the entire slope on the respondent’s property moving. The respondent’s property moved laterally and downwards towards the excavation on the appellant’s property, which resulted in extensive structural damage. Mr Venter’s property was also affected, resulting in him abandoning the property. The respondent attributed the damage to his property to the excavations by the appellant and instituted a claim for damages based on a breach of a duty to provide lateral support.

Decision by the Cape Town High Court:

The court a quo held that the duty of lateral support extends to buildings constructed on the land, provided that such land has not been ‘unreasonably loaded so as to place a disproportionate or unreasonable burden’. The court found that both the first appellant and Mr Venter owed the respondent a duty to provide lateral support to his property and both had breached this duty with regards to the excavations which were performed in their respective properties. The appellant appealed this finding to the SCA.

Issues decided by the SCA:

The first issue that was decided by the court was based on whether the duty of support was owed only in respect of land in its natural state or whether it also extends to the buildings and other structures on the land. Secondly, the court had to decide on whether there was a breach of literal support committed by the appellant’s excavations done on her property. Lastly, the court had to determine whether there was causation.

Court’s decision:

Firstly, the court examined the appellant’s argument based on English law that the duty of lateral support is owed only to land in its natural state. The court examined the development of our neighbour law and stated that the duty of lateral support is reciprocal between neighbours. The right is incidental to the ownership of property and is not servitutal in nature. In our neighbour law, fairness and equity are important considerations, and constitutional values of ‘ubuntu’ must be considered. It upheld the finding that the duty of lateral support extends to buildings on the land.

The court however rejected the court a quo’s contention that the duty of lateral support extends to buildings except where such land has been unreasonably loaded as to place an unreasonable burden on the neighbouring land. The court stated that this poses an unreasonable obligation on landowners who have complied with building and town planning regulations who would now have the duty of proving that the construction is not unreasonable or disproportionate.

Secondly, the court relied on the evidence of two geotechnical experts. The court followed that the respondent had succeeded in establishing that the slope mobilisation had resulted from a breach of the duty to provide lateral support on the appellant’s property. The court stated that although the slope instability was a contributory factor, it would be illogical for the court to deny that the destabilisation of the respondent’s property was not affected by the appellant’s excavation. As such, the court concluded that the appellant had breached their duty to provide lateral support to the respondent’s property.

Lastly, the court looked at the element of causation. The court examined whether, but for the excavation, the slope would have mobilised. The court found that the excavation was substantial and it is hard not to accept the second expert’s opinion that there was a clear link between the excavation and the slope failure. There must be a logical explanation that the respondent’s property mobilised shortly after the excavation, after being unaffected for 16 years.

The SCA held that the right to lateral support is a natural right incidental to the ownership of property. The court, therefore, dismissed the appeal with costs.


This case demonstrates that the right to property in respect to ownership is not absolute. It has also provided much-needed clarity on the duty of adjoining landowners to provide lateral support. Lateral support refers to the principle in property law that a person has the right to have his land supported by his neighbour’s land and that adjoining landowners cannot alter the boundaries of their properties so as to weaken a neighbour’s property.

Confusion existed as to whether or not this duty extended only to situations of land in its natural state (unimproved land) as is the case in English law, or applied to both the land and all buildings and structures erected on it, as applied in Roman and Roman-Dutch law.

After considering the position the court concluded that English Law principles had no place in our law of lateral support and that the duty of lateral support is owed to both the land and buildings erected on it.

Liability for removal of lateral support is strict and requires no proof of fault or negligence. A neighbour who has suffered harm would need to show both a factual and legal causal link between the removal of lateral support and the harm suffered.

Factual causation will exist where the harmful conduct (removal of lateral support) was a substantial factor in the harm caused. This does not require certainty but evidence that it was the probable cause.

Legal causation is also necessary and in this regard factors such as reasonableness, fairness and justice, the absence or presence of any intervening circumstances, and legal policy will be considered. One cannot impute liability to a wrongdoer where the harmful conduct is too remotely connected to the harm caused.

This is to conclude that the owner of a property has a natural right of lateral support from neighbouring properties, which right is not limited to land in its natural state but also extends to the buildings and other structures on the land. Lastly, where harm is established as a result of the removal of lateral support liability is strict and does not require proof of fault or negligence.

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