This article analyses how emergency legislation has affected law-making and regulatory quality principles (RQPs) before, during and after the COVID-19 pandemic (2019–2021) from stakeholders’ perspectives. It takes Slovakia as a case study, as this country was considered a high performer in the adoption of RQPs before the crisis, while empirical findings suggest a subsequent decline in their use. We argue that formal RQPs are not deeply embedded and are vulnerable to crises. In doing so, we conceptually distinguish between standard (fully following the RQPs), emergency (modified to accommodate crisis) and non-standard law-making (violating formal rules and the RQPs). In the transition from a crisis to a post-crisis context, the deployment of both emergency and non-standard law-making has become relatively permanent without proper justification having been provided. This reinforces the notion that RQPs and governance legitimacy became less important for the executive than in the pre-crisis period and emergency and non-standard regulatory law-making became institutionalised as new norms of swift law-making. All of these factors prevent stakeholders from being informed and from engaging in deliberation, which jeopardises the legitimacy of post-crisis law-making governance.