In planning appeals, courts are often reminded that they are not there to substitute their views for those of the planning tribunal. The Tribunal evaluates fact, design, massing, and context. The Court only intervenes on points of law. But how do we know when a mistake is legal?

A striking example lies in Malcolm Mallia v Planning Authority (Court of Appeal, App. 87/2024). The Tribunal had approved a five-storey guesthouse in Triq Manwel Dimech, Sliema, interpreting it as a suitable transition between the lower urban conservation area and the taller Plaza Hotel nearby. At first glance, this sounds like a planning judgment—a contextual reading of massing and urban fabric.

But the applicable policy—Policy P6 of DC2015—does not invite free-form interpretation. It includes a figure (Figure 26, Scenario 3) that sets a clear legal threshold: the site must directly adjoin a commitment of significantly greater height, and a set of criteria must be satisfied. The Tribunal acknowledged the general context, but not the legal structure of the policy. The Court found that the site was separated from the taller building by an intermediate property. There was no direct adjacency. The design criteria were not tested. No evidence was provided to show perimeter block integrity. The Tribunal applied its own sense of aesthetic logic—but failed to apply the legal test.

That is the hallmark of a point of law.

The Court’s judgment did not question the urban design strategy. It questioned the Tribunal’s legal authority to approve development outside the structural conditions of the policy. The site did not qualify under Scenario 3. The Tribunal lacked the discretion it believed it had. Its decision was not unlawful because it was unwise—it was unlawful because it ignored the only test that mattered.

This is how a point of law reveals itself. It is not about whether the Tribunal gave weight to the right factors. It is about whether it asked the right legal question. In this case, the question was simple: does the site adjoin the tall commitment? The answer was no. And everything that followed became legally irrelevant.

Planning law is full of discretionary zones. But when a policy lays down specific structural conditions, those conditions are not up for aesthetic reinterpretation. Ignoring them is not poor judgment. It is legal error. At least, that is how matters are seen by the courts.