Declaration of PerformanceDoP

A marking declaring that a product meets the applicable European Union legislation; for construction products it means performance has been assessed and declared against a harmonised European standard under the Construction Products Regulation. It is affixed by the manufacturer and supported by a Declaration of Performance and, where required, third-party assessment by a notified body.

The UK Conformity Assessed marking, introduced after the UK left the EU as the domestic equivalent of CE marking for goods placed on the market in Great Britain. Conformity is assessed against designated standards, with any required third-party work carried out by UK approved bodies; CE marking remains accepted for many product types under continuity arrangements.

A conformity assessment body designated by an EU member state and notified to the European Commission to carry out the third-party testing, inspection and certification tasks required by EU legislation, including those supporting CE marking. The UK equivalent under the UKCA regime is known as an approved body.

The harmonised European classification of construction products' reaction to fire under EN 13501-1, running from A1 (non-combustible) through A2, B, C, D and E to F, with supplementary classes for smoke production (s) and flaming droplets (d). UK building regulations reference Euroclass ratings for cladding, insulation and internal linings.

European Standards produced by the European standardisation bodies and adopted identically by national standards institutes, appearing in the UK as BS EN standards. Harmonised ENs under the Construction Products Regulation define how construction products, including roofing membranes and insulation, are tested, classified and CE marked.