R v Smith [1974] QB 354
Damage to property – mistake – Criminal Damage Act 1971
Facts
Smith was the tenant of a ground floor flat. With the landlord’s permission, he installed some sound equipment and soundproofing material. When he was given notice to exit the flat, the defendant ripped out the soundproofing to access the wires lying underneath it. As a matter of law, the soundproofing had become a fixture of the property and belonged to the landlord. Smith was charged with causing criminal damage to certain property. Smith’s defence was that he had an honest belief the property was his. This was not accepted by the trial judge and Smith appealed the decision.
Issues
It was important to consider the offence under the Criminal Damage Act 1971:
‘No offence is committed under Criminal Damage Act 1971, section 1(1) where a person damages property belonging to another if he does so in the honest though mistaken belief that the property is his own.’
The court was also concerned as to whether the belief that Smith had with regards to the property was reasonable or not.
Decision/Outcome
Appeal allowed. An honest but mistaken belief could be used as a lawful defence to such a charge under the circumstances. It was held that the trial judge had erred in not letting Smith demonstrate his case to the jury and this was considered to be a fundamental misdirection in the law. It was irrelevant to consider whether such a belief was justifiable or not as if the individual believed the property was his own, he lacked mens rea at the time of the act. The conviction was quashed as a result.
Updated 20 March 2026
This article accurately summarises the facts, issues, and decision in R v Smith [1974] QB 354. The core legal principle — that an honest but mistaken belief that property belongs to oneself provides a defence to criminal damage under section 1(1) of the Criminal Damage Act 1971, and that the reasonableness of that belief is irrelevant — remains good law.
Readers should note, however, that the broader context of mistake and mens rea in criminal damage has been significantly developed by later case law. In particular, R v Jaggard v Dickinson [1981] QB 527 applied and extended the honest belief principle to the lawful excuse defence under section 5(2) of the 1971 Act. More significantly, the House of Lords decision in R v G and Another [2003] UKHL 50 fundamentally reformed the law on recklessness in criminal damage, overruling MPC v Caldwell [1982] AC 341 and restoring a subjective approach to recklessness. While this does not affect the specific mistake principle in Smith, it is an important development in the surrounding law that students researching this area should be aware of. The Criminal Damage Act 1971 itself remains in force unamended in the relevant respects.
