CE marking for construction products (CPR): the Declaration of Performance

A pallet of cladding panels arrives on site with a tidy CE mark printed on every label, and the site engineer still refuses to fit it. The reason catches a lot of manufacturers off guard: for construction products, the CE mark on its own says almost nothing. What the engineer wanted, and what was missing, was the Declaration of Performance. That single document, not the logo, is what the Construction Products Regulation (CPR) actually obliges you to stand behind.

If you make aggregates, structural components, windows, insulation, concrete or any of the hundreds of product families covered by the CPR, the marking logic is unlike the CE marking used for machinery, toys or electronics. This is a sector with its own grammar, and getting it wrong shows up fast: in rejected deliveries, lost tenders and awkward questions from a buyer's technical team. Here is how the system really works, and where construction-product makers most often come unstuck.

CE marking under the CPR declares performance, not safety

Most CE marking lives under New Approach legislation, where the mark means the product meets defined safety requirements and is fit to be sold. The CPR works on a different premise. It does not certify that a brick, a beam or a sealant is safe or suitable for a particular building. It certifies that the product performs as the manufacturer has declared, measured by a common European method, so that the values can be trusted and compared across borders.

That distinction has a practical consequence. Deciding whether a declared performance is good enough for a specific wall, roof or structure is a national matter, settled by the designer, the building code and the specifier, not by the CE mark itself. Your job under the CPR is to declare the right characteristics, honestly and by the right route. The general route to the mark is set out on our construction products CE certificate page; this article stays one level up, on how the pieces fit together.

The Declaration of Performance is the legal heart of the system

When a construction product is covered by a harmonised European standard, drawing up a Declaration of Performance (DoP) is mandatory, and the CE mark cannot be affixed without it. The DoP is a short, controlled document, but it carries real weight: by signing it, you take legal responsibility for the conformity of the product with the performance you have stated.

The DoP itself is brief. It identifies the product type, the applicable harmonised standard, and the declared value for each essential characteristic, and that is largely it. What matters at this level is not the form but the weight those few values carry. They are not a marketing figure: a buyer, a specifier or a market-surveillance authority can hold you to exactly the numbers on the page, and you stay answerable for them long after the sale. That is why deciding what to declare is a commercial decision as much as a technical one. Over-declare to win a job and you own the gap when the product is tested; under-declare and you lose tenders to a competitor who stated more. The value you can honestly stand behind is the one that belongs on the DoP.

You do not have to declare a value for every characteristic. Where you choose not to, the entry reads NPD, meaning No Performance Determined, though at least one characteristic must always be declared, and a destination market may insist that certain characteristics are never left at NPD. The intended use you write into the DoP is not decoration: it fixes which characteristics are relevant and which assessment route you must follow.

One DoP covers one product-type, and it has to reach the customer, on paper or electronically, in the language the destination market requires. A buyer who asks for your DoP is not being difficult: under the CPR they are entitled to it, and a missing or vague declaration is the fastest way to stall a delivery or a tender submission.

Harmonised standards and the Annex ZA that switches on your duty

The trigger for the whole obligation is the harmonised standard, the hEN. When a product falls within the scope of a hEN, CE marking and a DoP become compulsory once that standard's period of coexistence has ended. Each hEN carries an Annex ZA, and that annex is the part to read first: it lists the essential characteristics you can declare, and it tells you which assessment and verification system applies to your product and its intended use.

The dates matter. Each harmonised standard has a date from which it may be used and a date after which it becomes the only route, and when a standard is updated those dates reset. Marking to a withdrawn version of a standard is a quiet but common nonconformity, and it is exactly the kind of thing a buyer's technical reviewer checks.

The practical examples are everywhere in the standards. A maker of external doors and windows works to a single product standard that sets out the characteristics and the route, which is why our EN 14351 CE marking and testing work follows that standard closely. A producer of aggregates declares a different set of characteristics again, and so does a maker of glass for construction use. The product changes, the logic does not.

When no harmonised standard covers your product, you are not stuck. You can ask a Technical Assessment Body to issue a European Technical Assessment (ETA), based on a European Assessment Document drawn up for that product type. The ETA then plays the role the hEN would have played, and you still issue a DoP and affix the mark on its basis.

AVCP: how much independent checking your product needs

Assessment and Verification of Constancy of Performance, usually shortened to AVCP, is the part that decides how involved an outside body has to be. The CPR sets five systems, numbered 1+, 1, 2+, 3 and 4. The higher the safety stakes attached to the product and its use, the more independent the checking, with system 1+ the most demanding and system 4 left almost entirely to the manufacturer. You do not get to pick your system: it is assigned in the Annex ZA of your standard.

Two points are easy to misread. A notified body under the CPR is not always a certifier of the product: under system 2+, by far the most common for structural and safety-relevant products, the body certifies your factory production control, while you remain responsible for type testing. And only systems 1+, 1, 2+ and 3 involve a notified body at all. Under system 4 there is no third party in the loop, which makes the manufacturer's own discipline the only safeguard.

Factory production control outlasts every audit

Running through all five systems is one constant obligation: factory production control, or FPC. This is the documented, permanent internal control of production that keeps output matching the declared performance long after any initial assessment. Raw-material checks, calibration, sampling, traceability and the handling of nonconforming product all sit inside it.

For products in systems 1+, 1 and 2+, a notified body inspects the FPC at the start and then returns for continuing surveillance, so the system has to stay alive between visits, not be revived the week before an auditor arrives. The most common reason a construction-product certificate is suspended is not a bad test result. It is an FPC that has quietly drifted out of use.

Where construction-product makers come unstuck

A few mistakes recur often enough to be worth naming. The first is treating CPR marking like the self-declaration route used for simpler products, and skipping the DoP or the notified body that the Annex ZA actually requires. The second is copying a competitor's DoP: the declared values, the intended use and the identification code have to match your product and your evidence, not theirs.

Misusing NPD is another, either declaring nothing useful on a product where the buyer's market expects a real value, or leaving a fire or structural characteristic blank where it is effectively mandatory. Stale documents cause their share of trouble too. When a harmonised standard is revised, the DoP and the underlying testing may need to follow, and importers and distributors carry their own duties to check that the mark, the DoP and the labelling are present and consistent before a product moves on.

One more shift is worth watching. The CPR is being revised, and a new regulation is phasing in over a long transition, with a stronger line on digital declarations, environmental information and the duties of everyone in the supply chain. None of it removes the core habit this article describes: declare the right characteristics, by the right route, and keep the evidence behind them current.

For products that fall outside the harmonised European system, the picture in Turkey is different again: non-harmonised construction products are placed on the domestic market under the national G mark rather than CE. Knowing which world your product belongs to, harmonised CE or national G, is the first decision, and it shapes everything that follows.