When proposing a widespread investment in a safety measure, it is common for some form of regulatory impact assessment to be undertaken. In this study, the cost-effectiveness of two proposals made by government bodies in England are investigated. The first is made by the London Assembly Planning Committee (LAPC) to retrofit London's existing high-rise residential buildings (HRRBs) with sprinkler systems. Similarly, the Ministry of Housing, Communities and Local Government (MHCLG) has called for evidence to support reducing the trigger height for sprinkler provision in new HRRBs. The redundant concept of a value for a preventable fatality is addressed using the J-value methodology. The baseline results show a J-value above unity for both proposals, suggesting that they are potentially not cost-effective. A sensitivity analysis highlights the embedded uncertainty and the implications for the J-value. For the MHCLG proposal, a large increase in annual fatalities for HRRBs would be required to support a reduction in trigger height for the inclusion of sprinklers. However, reasonable modification of some inputs results in a J-value below unity for the LAPC proposal, suggesting that this may be a cost-effective safety investment. It may be argued that this proposal be implemented to err on the side of caution.

中文翻译：

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判断法在英国高层住宅洒水保护监管影响评价中的应用

在提议对安全措施进行广泛投资时，通常会进行某种形式的监管影响评估。在这项研究中，对英格兰政府机构提出的两项建议的成本效益进行了调查。第一个是由伦敦装配规划委员会 (LAPC) 制定的，目的是用喷水灭火系统改造伦敦现有的高层住宅建筑 (HRRB)。同样，住房、社区和地方政府部 (MHCLG) 呼吁提供证据支持降低新 HRRB 中喷水灭火装置的触发高度。使用J值方法论解决了可预防死亡事故值的冗余概念。基线结果显示J- 两个提案的价值高于统一，表明它们可能不具有成本效益。敏感性分析突出了嵌入的不确定性和对J值的影响。对于 MHCLG 提案，需要大幅增加 HRRB 的年死亡人数，以支持降低包含洒水喷头的触发高度。但是，对某些输入进行合理修改会导致LAPC 提案的J值低于 1，这表明这可能是一项具有成本效益的安全投资。有人可能会争辩说，实施此建议是为了谨慎行事。