UK Conformity Assessed (UKCA) marking is a conformity mark that indicates conformity with the applicable requirements for products sold within Great Britain.

Applicability of UKCA and CE marks

The UKCA marking became part of UK law at the end of the Brexit transition period, on 31 December 2020, with the coming into force of The Product Safety and Metrology etc. (Amendment etc.) (EU Exit) Regulations 2019. It has been mandatory since then but the CE mark was to be accepted as an alternative until 1 January 2022. This deadline was extended to 31 December 2022, then to 1 January 2023, then to 31 December 2024; on 1 August 2023 the deadline was extended with the CE mark accepted indefinitely for most goods as a valid alternative.

The scope and procedures of the UKCA scheme will initially follow those for CE marking but, the Government said that after 31 December 2020 the two schemes may diverge. Initial guidance regarding UKCA marking was originally published by the Government of the United Kingdom in 2019 ahead of a potential no-deal Brexit but was subsequently withdrawn.

Characteristics of UKCA marking

The height of the UKCA marking must be at least 5mm; it may be larger so long as the proportions are kept. The marking should be "easily visible, legible, and [from 1 January 2023] permanently attached to the goods".

Northern Ireland

The UKCA marking only applies to products placed on the market in Great Britain. In Northern Ireland, a part of the United Kingdom that remains aligned to the European Single Market due to the Northern Ireland Protocol, CE marking continues to be required. UK-resident bodies are no longer qualified to carry out CE mark conformity assessments for goods intended for the EU, but under the Northern Ireland Protocol they may do so for Northern Ireland. Where a UK body has carried out the assessment for goods intended for Northern Ireland, the product should display both the CE mark and a UKNI mark. However, goods intended for export to the EU must be assessed by an EU-resident body and carry a CE mark (and must not carry the UKNI mark).

As part of the British Government's policy of "unfettered access" for "qualifying Northern Ireland goods" to be sold in Great Britain without restriction, goods may be sold in Great Britain using the relevant Northern Ireland markings and without any additional approvals that would be required for the UKCA marking.