Electronic signature for construction
Building, civil engineering and public works companies sign an average of 50 to 200 documents per project: accepted quotes, subcontracting contracts, acceptance certificates, amendments, delivery notes. Electronic signature eliminates paper back-and-forth between office, site and suppliers — sign everything online, from a phone, in seconds, with full legal value (eIDAS).
Construction loses weeks per project chasing signatures
An average project generates 50 to 200 documents to sign between the owner, engineer, main contractor and subcontractors. Mail delays, rescheduled meetings and lost documents block work start, payment of invoices and defect clearance. With mobile electronic signature, each document is signed on site, from the project, and archived instantly with its audit trail.
All construction documents signable online
From the commercial phase to delivery, including subcontracting and changes during construction. Legal compliance is strictly equivalent to paper (Civil Code article 1367, eIDAS regulation).
Subcontracting contracts
DC4 contracts, subcontracting agreements, owner approvals. Multi-party signature with guaranteed order (main contractor, subcontractor, owner). Compliance with the December 31, 1975 subcontracting law.
Acceptance certificates
Acceptance records with or without reservations, lifting of reservations, satisfactory completion certificates. On-site signature with RFC 3161 timestamp — undisputable proof of reception date for warranties (satisfactory completion, two-year, ten-year).
Accepted quotes and purchase orders
Reduction of signature time from several days to a few minutes. The customer receives the quote by email, signs in one click from their phone, the sales representative is notified immediately and can schedule the work.
Amendments during construction
Change orders, additional service requests, specification changes. Immediate signature from the project to avoid blockages — no return to office, no rescheduled meeting.
Delivery notes and certificates
Supplier delivery notes, worker presence certificates, URSSAF certificates, due diligence certificates. Mobile signature for the site manager, automatic 10-year archiving.
Regulatory documents and compliance
DPGF, CCTP, technical reports, ten-year insurance certificates, Qualibat certificates. Advanced signature (AES) with identity verification for documents opposable to the administration.
Why construction benefits most from going digital
Signature time divided by 10
An acceptance certificate that took 5 to 10 days to get everyone to sign is signed in less than 24 hours. Invoice payments are unblocked faster, cash flow improves.
Mobile signature on the project
No application to install. The signatory receives an SMS or email, opens the link, signs with their finger on their phone. Compatible with Android tablets used on projects.
RFC 3161 opposable audit trail
Each signature includes the date, IP, authentication method, qualified timestamp. Essential in case of dispute over the reception date (start of warranties) or the identity of the signatory.
Frequently asked questions — construction electronic signature
- Does an electronically signed acceptance certificate have the same value as a paper certificate?
- Yes, strictly the same. Article 1367 of the Civil Code and the European eIDAS regulation recognize electronic signature as equivalent to handwritten signature. The electronically signed certificate starts the warranties (satisfactory completion, two-year, ten-year) as of the document timestamp date. The date is even more opposable than a paper certificate (qualified RFC 3161 timestamp) as it is non-modifiable.
- Can you sign on a project without 4G connection?
- Yes for viewing and local signature. The signature link opens in the browser; if the signatory is in a coverage gap, they can sign offline and the signature will be sent once the network is back. For underground projects or very isolated areas, the Certyneo mobile app caches signatures until reconnection.
- Is electronic signature accepted by insurance companies for ten-year coverage?
- Yes. Ten-year insurers accept electronically signed acceptance certificates as the start of warranty coverage, provided the signature is eIDAS compliant (advanced level recommended for claims exceeding €100,000). The RFC 3161 audit trail included in the signed PDF is stronger proof than a handwritten signature on paper for the reception date.
- How to sign a subcontracting contract with a subcontractor who has no account?
- No account is required on the signatory's side. You (main contractor) send the DC4 contract from your Certyneo account: the subcontractor receives an email with a personalized link, signs in a few clicks, the owner then receives their own signature request for approval. You pay per envelope sent, the subcontractor signs for free.
- Can electronic signature be integrated into a project management software (Onaya, Tolteck, Batappli)?
- Yes via the REST API. The main ERP systems in construction integrate with Certyneo either natively (pre-built connectors) or via API: one click in your software sends the document to sign, the signature status automatically returns to the project folder, the signed PDF is archived in the client folder. For Onaya, Tolteck, Batappli, EBP Bâtiment: contact our team for configuration.
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