Is a digital work order legally valid?

A customer signs with a finger on a tablet screen — is that legally just as watertight as a signature on paper? Short answer: in practice, usually yes, but the underlying basis sits in two layers of legislation that interlock. Below you can read exactly how that works, and what you can do to strengthen the evidential value of your digital work order.

The starting point: electronic is allowed, unless

The basic rule is set out in the eIDAS Regulation ((EU) No 910/2014), directly applicable EU law. Article 25(1) provides that the legal effect of an electronic signature and its admissibility as evidence must not be denied solely because the signature is in electronic form, or because it does not meet the requirements for qualified electronic signatures. A judge therefore cannot wave away a digital signature purely because it isn't pen-on-paper, or because it isn't the heaviest level.

Article 25(2) goes a step further for the heaviest category: a qualified electronic signature has the same legal effect as a handwritten signature (source: eIDAS Regulation, art. 25).

The three types of electronic signature

eIDAS distinguishes three levels, with increasing reliability:

• Simple electronic signature. Electronic data that is linked to other electronic data and used by the signatory to sign. A finger signature on a tablet screen in a work order app usually falls into this category.
• Advanced electronic signature (AES). Meets additional requirements from eIDAS article 26: uniquely linked to the signatory, enables identification, is created under the sole control of the signatory, and any subsequent changes are detectable.
• Qualified electronic signature (QES). An advanced signature plus a qualified certificate from a recognised trust service and a secure means of creating it. This is the only level that is automatically legally equivalent to a wet-ink signature.

For most work orders in refrigeration engineering, a simple electronic signature is sufficient in practice — you rarely have a notarial transaction to sign. But "sufficient" here means: legally valid, not necessarily incontestable evidence. That distinction is exactly what the next two sections are about.

What does the Dutch Burgerlijk Wetboek say?

eIDAS is EU law, but the Netherlands has further specified the qualification for non-qualified signatures itself, in article 3:15a of the Burgerlijk Wetboek. That article provides that an electronic signature has the same legal effects as a handwritten signature, provided the method used is sufficiently reliable, having regard to the purpose for which the data was used and to all other circumstances of the case (source: BW art. 3:15a). The article itself does not list concrete criteria — it refers to the eIDAS categories above.

Those concrete criteria are set out in eIDAS article 26, the definition of the advanced electronic signature: uniquely linked to the signatory, enables identification, is created using means that the signatory keeps under their own control, and is linked to the file in such a way that subsequent changes are noticeable. For a work order app this means, in concrete terms: the better you record who signed, when, and whether the work order was subsequently changed, the stronger your position if it ever comes to a dispute.

Evidential value: what if a customer disputes the signature?

Should a customer later claim they did not agree, that is a matter of the law of evidence, not of validity. In civil proceedings, the free evaluation of evidence applies: evidence can be delivered by any means, and its assessment is a matter for the judge's judgment (Wetboek van Burgerlijke Rechtsvordering, art. 152). A digital work order with a simple electronic signature is therefore admissible as evidence — but how convincing the judge finds it depends on the circumstances: is it clear who signed, when, and has the work order remained unchanged since?

That is a different consideration than with a qualified signature, which by definition has the same evidential force as a wet-ink signature. For a work order, that heavy level is rarely necessary or proportionate — it is primarily about demonstrating work carried out, not a notarial deed.

What makes a digital work order strong as evidence?

In practical terms, translated into what a work order app should record:

• Timestamp. The exact moment of signing, linked to the work order.
• Identity of the signatory. Name and, where relevant, role (for example "on behalf of the client").
• Immutability afterwards. The work order (including signature, completed fields and photos) must not be editable after signing without that being visible.
• Direct link to the content. The signature must be traceable to the exact work order that was signed — not a separate file that is linked later.
• Retention. The same retention obligation as for paper work orders applies in full; see what needs to be on a work order? for the seven-year term and the content requirements.

None of these points changes the legal validity as such — that already follows from eIDAS and art. 3:15a BW — but they determine how much weight the signature carries if it ever comes to a dispute.

How Koldwerk implements this

In Koldwerk the customer signs on site on the technician's screen, even without an internet connection. After signing, the work order is locked, with a timestamp and linked materials and hours, and flows through to the invoice and — for refrigerant work — to the logbook. That way you automatically build up the record that strengthens the evidential value of your work order, without having to set up a process for that yourself. More about the digital work order itself is on /software/digitale-werkbonnen.

Further reading

• What needs to be on a work order? — the content requirements and retention period.
• Work order on paper vs digital: the real costs — the time and cost side of digitising.
• Glossary — for related technical terms.

Disclaimer: this is general information, not legal advice. Whether a specific signature implementation is sufficiently reliable within the meaning of art. 3:15a BW depends on the concrete circumstances. If in doubt — for example with high dispute amounts or international customers — consult a lawyer specialised in ICT/evidence law.