From 1 July 2013 it will become mandatory for manufacturers of construction roducts, including windows and doors, to apply a CE marking to their products. This requirement is part of the Construction Products Regulation 2011 (CPR), which replaces the Construction Products Directive (CPD).     Who is responsible for CE marking? Under CPR, the manufacturer* of a product must apply the CE marking. The ‘manufacturer’ is classed as the company or individual that creates the finished ‘construction element’. In the case of windows and doors, this means the person who supplies the frame and glass. From 1 July 2013, therefore, all fabricators will need to apply CE markings to their products. Failure to do so will be a criminal offence.   Why is CE marking becoming mandatory? The aim of CPR is to harmonise compliance with European standard EN14351-1 across the EU. A CE marking indicates to a customer that a product conforms to specific European technical standards, known as harmonised European Norms (hEN).