Electronic signature in construction: complete guide 2026

Why construction needs electronic signature in 2026

The construction and public works sector is one of the most document-intensive in the French economy. Each construction site mobilises on average around twenty distinct contractual documents: works contracts, service orders, amendments, progress reports, subcontracting agreements, reception minutes, ten-year guarantees… The French Building Federation (FFB) estimated in 2025 that administrative costs represented between 8% and 12% of turnover for companies in the sector. In this context, electronic signature in the construction sector contracts is no longer a technological option — it is an operational necessity.

The adoption of digitalisation has accelerated considerably since the requirement for electronic submission of tenders for public procurement above €40,000 ex VAT (decree no. 2016-360). In 2026, the question is no longer whether construction should sign electronically, but how to do so in a compliant, secure and efficient manner.

Document flows specific to construction

Unlike a consulting firm or online commerce operator, a construction company manages document flows that are both very voluminous and highly diverse. Generally, the following are distinguished:

• Contract flows: public contracts submitted via DUME or Chorus Pro platforms, direct private contracts, design-build contracts.
• Site documents: service orders (OS), site reports, reception minutes (PVR), reserve lift sheets.
• Subcontracting acts: contracts under article L 241-1 of the law of 31 December 1975, subcontractor approvals, bank guarantees.
• Field HR documents: fixed-term contracts (seasonal contracts, temporary work), timesheets, classification amendments.

Each of these flows involves multiple signatories, often geographically dispersed across several locations. Paper signature then implies courier delays, loss risks and considerable reprography costs.

Key figures justifying the digital transition

According to the 2025 annual report of the National Union of Second Works Enterprises (SNSO), a medium-sized construction company (50 to 200 employees) processes on average 380 documents requiring signature per month. The average signature delay in paper mode ranges between 4 and 11 working days depending on document complexity. With an eIDAS-compliant electronic signature solution, this delay falls to less than 24 hours in 78% of cases, according to sector benchmarks published by the IT Industries Group (GMI) in 2026.

These gains are not limited to time: they directly impact cash flow. In construction, a purchase order or progress report signed more quickly enables invoicing sooner, mechanically reducing working capital requirement (WCR). To assess the precise impact in your organisation, the electronic signature ROI calculator from Certyneo allows you to estimate achievable savings in a few minutes.

Which signature level to choose for construction contracts?

The eIDAS regulation (no. 910/2014) establishes three levels of electronic signature, and all are not equivalent depending on the type of document signed in the context of a construction site. To deepen this hierarchy, our complete guide to eIDAS 2.0 regulation details the practical implications for each level.

Simple electronic signature (SES)

SES constitutes the minimum level. It corresponds to data in electronic form associated with other electronic data and used by the signatory to sign. In practice, this may be a simple checkbox or a click on an email link. In construction, it is acceptable for documents with low contractual stakes: acknowledgements of receipt, meeting reports, information bulletins.

Legal risk: in the event of dispute, the evidential value of an SES can be challenged if the signatory's identity is not verified robustly. However, construction is a highly contentious sector (CNAC — National Committee for Arbitration in Construction), which makes SES insufficient for the majority of material acts.

Advanced electronic signature (AES)

AES meets four precise requirements of eIDAS regulation: it is linked to the signatory in a unique manner, it allows identification of them, it is created from data under their exclusive control, and any subsequent alteration of the data is detectable. It is recommended for:

• Modifying service orders
• Amendments to private contracts
• Subcontractor approvals (law of 31 December 1975)
• Reception minutes
• Progress reports

AES offers a good balance between legal security and ease of use for site staff (works managers, site supervisors).

Qualified electronic signature (QES)

QES constitutes the highest level and benefits from a legal presumption of reliability under article 26 of eIDAS regulation. It is generated using a qualified signature creation device (QSCD) and is based on a qualified certificate issued by a qualified trust service provider (QTSP) appearing on the European Trust List (TSL).

In construction, QES is essential for:

• Public contracts above European thresholds (€5.38 million ex VAT for works in 2024)
• Certain restricted call for tenders procedures
• Public-private partnership contracts (PPP)
• Any act subject to a legal requirement for authentic or notarised signature

Our comparison of electronic signature solutions analyses in detail the qualified providers available on the French market in 2026.

Electronic signature and public works contracts

Public procurement represents approximately €180 billion annually in France according to the Economic Observatory for Public Procurement (OECP). Construction captures a very significant share of this. Since the reform of public procurement (decree of 25 March 2016 codified in articles R. 2182-1 et seq. of the Public Procurement Code), digitalisation of procedures is the rule for all contracts above €40,000 ex VAT.

Specific requirements of public buyers

Public buyers (local authorities, public institutions, network operators) have specific requirements regarding electronic signature. These focus in particular on:

1. Certificate format: XAdES, PAdES or CAdES profiles compliant with ETSI EN 319 132 and EN 319 122 standards are generally required.
2. Time validation: qualified time-stamping is often required to prove the priority of a tender before the deadline. Our article on qualified electronic time-stamping and its legal value details the issues for construction companies.
3. Interoperability: public platforms (PLACE, ATEXO, Maximilien…) must be able to automatically verify the validity of submitted signatures.

A frequent error by construction companies is submitting tenders with SES signatures or native PDF signatures (Adobe Reader), which can be automatically rejected by the buyer platform control system.

Subcontracting and law of 31 December 1975: a rigorous legal framework

Law no. 75-1334 of 31 December 1975 relating to subcontracting constitutes one of the cornerstones of French construction law. It requires the main contractor to have each subcontractor and their payment terms approved by the client. This mechanism generates a significant flow of bilateral or trilateral documents requiring multiple signatures.

Advanced electronic signature enables management of this workflow seamlessly: the main contractor initiates the signature circuit, the subcontractor signs first, then the client validates. Everything is traceable, time-stamped and stored in a compliant digital safe.

Integrating electronic signature into construction field processes

The adoption of electronic signature in construction often encounters a practical obstacle: field signatories (works managers, site supervisors, subcontracting craftsmen) are not "white-collar" office workers. They sign from a smartphone on site, sometimes in areas of poor connectivity.

Mobile accessibility and offline signature

An electronic signature solution adapted to construction must necessarily offer:

• A responsive mobile interface, usable on Android/iOS tablet or smartphone
• The possibility to sign in offline mode with deferred synchronisation
• Simplified authentication (SMS OTP, facial recognition on mobile)
• Standardised output formats (PDF/A for long-term archiving)

Certyneo has developed signature workflows adapted to field constraints, notably with the possibility to delegate signature to an identified legal representative without going through a paper signature transfer.

Integration with construction industry software

Construction companies use specialised ERP systems: Batigest, Onaya, Sage Batimédia, ATTIC+, MyBeeSpot, or Procore for large groups. Native integration via API (REST or webhook) with these business tools is decisive in order to avoid creating an additional silo. Certyneo offers native connectors and documented API allowing a signature circuit to be triggered directly from these business software applications, without manual re-entry.

For companies managing recurring contract templates (standard subcontracting, supply contracts), the Certyneo AI contract generator also allows pre-filled acts to be produced, ready for signature in a few clicks.

Legal archiving and traceability of construction documents

In construction, document retention periods are governed by strict legal obligations. Guarantees relating to works (ten-year guarantee art. 1792 of the Civil Code, two-year guarantee art. 1792-3, completion guarantee art. 1792-6) require retention of reception documents for up to 10 years after work completion. Public contracts are subject to a 4-year limitation period (law of 31 December 1968) for claims against public bodies.

A compliant electronic signature solution must therefore include archiving with evidential value: certified NF 461 digital safe, retention of evidence file (audit trail), and integrity guarantee via cryptographic sealing of the signed document. These elements are constitutive of the legal value of electronic signature that will be enforceable in the event of dispute.

Deployment and change management in construction companies

Implementing electronic signature in a construction company is not solely an IT project: it is an organisational project. Change management is often the differentiating factor between successful deployment and a return to paper after six months.

Identifying priority flows and internal sponsors

The recommended practice by specialisation consultancies in construction digital transformation is to start with high-volume and high-stakes flows: monthly progress reports and service orders. These two typologies combine the ideal characteristics for a first rollout wave: predictable recurrence, identified signatories, tight timelines.

You must then identify an internal sponsor — often the technical director or finance and administration manager — who will champion the project with field teams. Training for works managers should be short (less than 2 hours) and focus on essential actions: initiating a circuit, signing on mobile, checking document status.

Migration from existing tools

Many construction companies have already experimented with DocuSign or YouSign for occasional needs. If you wish to consolidate your use on a single platform more adapted to French and European specificities, the guide to migrating from DocuSign or YouSign to Certyneo describes the technical and contractual steps to anticipate for a seamless transition.

Legal framework applicable to electronic signature in construction

Electronic signature in the construction and public works sector is part of a series of regulatory texts that must be mastered to guarantee the legal value of signed acts.

French civil law

Articles 1366 and 1367 of the Civil Code (resulting from ordinance no. 2016-131 of 10 February 2016 reforming contract law) constitute the foundation of electronic evidence law in France. Article 1366 provides that "electronic writing has the same evidential force as writing on paper, provided that the person from whom it emanates can be duly identified and it is established and preserved in conditions designed to guarantee its integrity". Article 1367 specifies that "the signature necessary for the perfection of a legal act identifies its author" and that "when it is electronic, it consists in the use of a reliable identification process guaranteeing its link with the act to which it is attached".

eIDAS Regulation no. 910/2014

The eIDAS European regulation (Electronic Identification and Trust Services) applies directly in all EU Member States, without need for national transposition. It establishes:

• Free movement of electronic trust services
• The hierarchy of three signature levels (SES, AES, QES)
• Mutual recognition of qualified providers (QTSP) appearing on national Trusted Lists
• The presumption of reliability of qualified signatures (article 25, §2)

In 2024, eIDAS 2.0 (EU Regulation no. 2024/1183) strengthened the framework by introducing the European Digital Identity Wallet (EUDIW), whose applications for construction (identification of craftsmen, verification of professional qualifications) are being rolled out in Member States.

Public Procurement Code

For public works contracts, articles R. 2132-7 and R. 2182-1 to R. 2182-13 of the Public Procurement Code govern electronic signature requirements. The order of 12 April 2018 on electronic signature in public procurement specifies that signatures must be compliant with ETSI EN 319 132 (XAdES) or ETSI EN 319 122 (CAdES) or ETSI EN 319 162 (PAdES) standards, in their baseline B or higher profile.

Subcontracting law and responsibilities

Law no. 75-1334 of 31 December 1975 requires written form for subcontracting contracts and their approvals. An act signed electronically with AES or QES satisfies this form requirement. However, SES without robust identity verification could be challenged before the civil court or administrative court.

GDPR and protection of signatory data

Processing of personal data of signatories (name, first name, email address, telephone number for OTP, possible biometric data) is subject to the General Data Protection Regulation (GDPR, no. 2016/679). The electronic signature provider acts as a processor within the meaning of article 28 of GDPR. A compliant DPA (Data Processing Agreement) must be signed with each supplier. Signatory data may not be retained beyond the duration necessary for the evidential value of the document, and individual rights (access, rectification, erasure) must be guaranteed.

Legal risks from non-compliance

Using non-compliant electronic signature exposes the construction company to several risks: tender rejection by the public buyer, nullity of the subcontracting contract, inability to assert a right in the event of a loss covered by the ten-year guarantee, and exposure to CNIL sanctions for GDPR breaches (up to 4% of annual worldwide turnover).

Electronic signature use cases in construction

Scenario 1: a second works general contractor managing 150 service orders per month

A second works company employing around one hundred staff operates on several residential building sites simultaneously. Each month, it issues and receives approximately 150 service orders and amendments, involving between 3 and 6 signatories per document: the client, the project manager, the works manager and sometimes a specialised subcontractor.

Before implementing advanced electronic signature, the average return time for a signed service order was 6 working days. The process involved printing, postal or courier delivery, manuscript signature, scanning and paper archiving. After deploying an AES solution integrated with their building ERP, the average time fell to 18 hours. The reduction in administrative cost (printing, mail, physical archiving) was estimated at 23% of direct administrative charges linked to sites, representing annual savings of around €35,000 to €45,000, consistent with the ranges published by the FFB in its 2025 report on sector digitalisation.

Scenario 2: a group of companies responding to a public works tender

Three public works companies form a temporary joint venture (JV) to respond to a call for tenders for construction of a major structure with an estimated value of €12 million ex VAT. The procedure is formalised on a buyer digitalisation platform requiring qualified PAdES signatures compliant with ETSI EN 319 162.

The joint venture leader must coordinate signatures from the technical director of each joint bidder, who are located in three different cities. Using a qualified sequential signature circuit configured in advance, the three acts of commitment and the joint venture agreement are signed in less than 4 hours on the day of tender submission, without physical travel or risk of rejection due to non-compliant format. Submission is automatically validated by the buyer platform, certifying the compliance of the qualified certificates used.

Scenario 3: a property developer managing subcontractor approvals for an 80-unit programme

A property developer-builder manages an 80-unit programme involving 14 distinct trades, representing 22 subcontracting companies to be approved with the delegated client. Each approval requires the trilateral signature of the subcontractor, the main company and the client.

Without digitalisation, managing these 22 approval files mobilised a full-time administrative assistant for 3 weeks. With an advanced electronic signature solution incorporating automatic reminders and a real-time tracking dashboard, all approvals were finalised in 8 calendar days. The manual follow-up rate fell from 60% to less than 10%, with automated reminders handling the majority of follow-ups. The legal department estimated the risk reduction from delayed site commencement (and associated penalties) as a potential saving of €15,000 to €25,000 over the programme duration.

Conclusion

Electronic signature in construction is no longer a matter for prospective discussion: it is an operational reality that construction companies can no longer ignore in 2026. Whether it is public contracts requiring a qualified signature compliant with ETSI standards, subcontractor approvals required by the law of 31 December 1975, or service orders to be signed from a site in a rural area, electronic signature addresses each of these challenges with proven legal and operational efficiency.

The gains are tangible: reduction of signature delays by 70 to 90%, decrease in administrative charges, securing the evidential value of acts, and compliance guaranteed with eIDAS regulation and the Public Procurement Code.

Certyneo was designed to precisely meet the requirements of construction stakeholders: multi-signatory workflows, API integration with business ERP systems, archiving with evidential value and signature levels adapted to each type of act. Test Certyneo free of charge or view our pricing to find the package suited to your company's size.