Real Estate Sales Agreement & Electronic Signature

The digitalization of the real estate sector has accelerated considerably since 2020. Today, more than 60% of French real estate professionals use electronic signature for their pre-contracts, according to estimates from the National Federation of Real Estate (FNAIM). Yet many questions remain: does a sales agreement or promise to sell signed electronically have the same legal value as a paper deed? What level of signature should be required? What is the notary's role in this process? This article provides clear and expert answers, grounded in positive French law and the European eIDAS regulation.

What the law says about electronic signature of a real estate sales agreement

The legal value of electronic writing under French law

Since the law of March 13, 2000, codified in articles 1366 and 1367 of the Civil Code, electronic writing is recognized as equivalent to paper writing, subject to two cumulative conditions: reliable identification of the person it originates from, and guarantee of document integrity. The real estate sales agreement, which constitutes in French law a bilateral pre-contract irrevocably binding the two parties subject to suspensive conditions, can therefore be perfectly concluded in electronic form.

However, the nature of this deed requires special precautions. A sales agreement is not a simple purchase order: it can commit sums of several hundred thousand euros and must satisfy strict pre-contractual information obligations (Alur law, Macron law, mandatory property inspections). The robustness of the signature used directly conditions its probative value in case of dispute.

The three levels of eIDAS signature applied to real estate

The eIDAS Regulation No. 910/2014 distinguishes three levels of electronic signature, whose relevance varies depending on the type of real estate deed:

Simple Electronic Signature (SES): sufficient for information documents or low-value search mandates, it is generally insufficient for a sales agreement due to high contestation risk.

Advanced Electronic Signature (AES): this is the level recommended by professional practice for sales agreements under private deed. It is based on strong authentication of the signatory (generally via an OTP code sent to the mobile phone and documentary identity verification). It allows unique identification of the signatory, detection of any document alteration after signature, and engagement of the signatory's liability.

Qualified Electronic Signature (QES): mandatory for notarial authentic deeds, it is based on a qualified certificate issued by a trust service provider (TSP) listed on the European Trust List. For electronic authentic deeds (EAD), the notary has had since 2008 a specific qualified signature creation device, managed by the Superior Council of Notaries (CSN) via the REAL infrastructure (Electronic Network of Authorities and Notaries).

Private sales agreement vs. authentic deed: two distinct regimes

It is crucial to distinguish two legally different situations:

The sales agreement under private deed, drafted and signed directly between individuals or via a real estate professional (real estate agent, notary in advisory capacity only), can be signed with an advanced electronic signature. No law requires qualified signature here for ordinary properties (excluding sale of future property or certain properties subject to special regimes).

The unilateral promise to sell (or promise to purchase), when registered with the tax administration within ten days (article 1589-2 of the Civil Code, on pain of nullity for certain promises), requires special attention: registration can be carried out in dematerialized form, but signature authenticity must be incontestable.

The authentic sales deed (definitive deed signed at the notary's office), requires mandatory qualified electronic signature by the notary, in accordance with decree No. 2005-973 of August 10, 2005 and subsequent texts relating to the electronic authentic deed.

The notary's central role in real estate electronic signature

The Electronic Authentic Deed (EAD): a silent revolution

Since 2008, French notaries have been able to draw up fully dematerialized authentic deeds. In 2025, more than 95% of real estate sales deeds with notaries are drafted in electronic form according to CSN data. The Electronic Authentic Deed (EAD) presents major advantages: enhanced probative force, opposability to third parties, secure conservation in the MINUTIER CENTRAL system (central digital archiving).

The notary affixes his qualified electronic signature using a personal encrypted USB key and a PIN code. This signature is based on a qualified certificate issued by the notary's chamber, compliant with the requirements of the ETSI EN 319 132 standard for XAdES signatures, or CAdES/PAdES depending on the document format.

Remote appearance: notarial remote signing

The ELAN law of November 23, 2018 (article 20) then decree No. 2020-395 of April 3, 2020 legalized in France remote appearance before a notary, also called "remote notarial deed" or "remote signing". This procedure allows the buyer and/or seller to sign the authentic deed without physically traveling to the notary's office, via a secure videoconferencing platform approved by the CSN.

Concretely: the notary is present in the office, the client(s) appear remotely via video. Identity verification is performed in real time, and signatures are affixed electronically via a secure process. This advancement has considerably streamlined transactions, particularly for buyers residing abroad or in remote regions.

Sales agreement signature at the real estate agent or online

In common practice, the sales agreement is frequently signed at the real estate agent or online, outside any notarial framework. In this case, SaaS electronic signature platforms like Certyneo for real estate play a decisive role: they must guarantee:

• Identity verification compliant with eIDAS (documentary verification + facial liveness for advanced levels)
• Qualified timestamping of the signed document
• Complete audit trail (logs, IP addresses, document fingerprints)
• Secure conservation of signature proofs

The complete guide to electronic signature details the technical criteria to verify when choosing your solution.

Practical procedure: signing a real estate sales agreement online step by step

Prepare the document file

Before any signature, the seller must prepare the technical inspection report (TIR) including notably: the energy performance certificate (EPC), the risk assessment report for lead exposure (RARE) if the property predates 1949, the condition of the interior electricity and gas installation if they are more than 15 years old, the risk and pollution assessment (RPA), and the asbestos inspection for building permits prior to July 1997.

These documents must be attached to the sales agreement and integrated into the document package submitted for electronic signature. A professional platform must allow signature of multi-page documents with annexes, and generate a single probative file including the entire file.

The electronic signature process

An advanced electronic signature process for a real estate sales agreement typically follows these steps:

1. Download and preparation: the professional imports the agreement and its annexes onto the platform, places signature and initial zones page by page.
2. Signatory invitations: buyer(s) and seller(s) receive a secure link by email.
3. Identity verification: depending on the signature level, the signatory uploads an ID document and performs a selfie or dynamic facial recognition.
4. Reading and initialing: the signatory reviews the document, affixes initials on each page (or accepts automatic scrolling).
5. OTP code: a one-time code is sent by SMS to the verified phone number of the signatory.
6. Signature affixing: the signature is cryptographically linked to the document, timestamped and recorded with the audit trail.
7. Archiving: all parties receive a copy of the signed agreement in PDF/A with its proof report.

Withdrawal period and electronic signature

The SRU law (article L. 271-1 of the Construction and Housing Code) grants a non-professional buyer a withdrawal period of 10 calendar days from notification of the pre-contract. In the context of electronic signature, this notification can be made by dematerialized means (registered electronic letter or secure traceable sending), provided the receipt is probative and timestamped. The signature platform must therefore integrate a registered electronic sending functionality compliant with the ETSI EN 319 532 standard.

Note that the period runs from the day after the first presentation of the registered letter, not from its signature. Choosing an integrated solution managing both signature and registered electronic notification simultaneously considerably simplifies this critical step.

Choosing the right electronic signature solution for real estate

Platform selection criteria

Faced with the proliferation of offerings on the market (DocuSign, Yousign, Universign, Certyneo and others), real estate professionals must evaluate platforms on precise criteria:

Regulatory compliance: the platform must be certified by an accredited body (ANSSI, BSI, LSTI…) and listed on or supported by TSPs listed on the EU Trust List. Verify ISO 27001 certifications, eIDAS advanced and/or qualified level depending on your needs.

User experience: in real estate, signatories are often individuals unfamiliar with electronic signature. The process must be intuitive, available on mobile, and accompanied by contextual help.

Business integrations: ideally, the solution integrates with your real estate management software (Périclès, Immofacile, iadmin, Apimo…) via REST API or native connectors.

Probative archiving: beyond signature, secure conservation of signed documents for legal periods (30 years for a sales deed) is a major issue. Some platforms offer an integrated digital safe compliant with the NF Z 42-020 standard.

Support and SLA: for transactions with high financial stakes, support availability (ideally 24/7) and availability SLA above 99.9% are prerequisites.

To objectively compare market solutions, consult our comparison of electronic signature solutions.

ROI of electronic signature in real estate agency

Adoption of electronic signature generates measurable gains for real estate professionals:

• Reduction in signature time: a traditional agreement typically requires 5 to 10 days of coordination to gather parties; electronic signature reduces this timeline to 24-48 hours in most cases.
• Reduction in logistical costs: printing, registered postal sending, physical archiving represent between 15 and 30 € per file depending on agencies.
• Reduction in incomplete file rate: platforms enforce completion of all required fields before signature, eliminating forgotten initials or signatures on certain pages.
• Improvement in customer experience: the possibility to sign from home or office, without travel, is a differentiating sales argument.

Calculate your personalized return on investment with our electronic signature ROI calculator.

Legal framework applicable to electronic signature of real estate sales agreements

Foundational texts

Civil Code, articles 1366 and 1367: these two articles constitute the foundation of French law on electronic evidence. Article 1366 states that "electronic writing has the same probative force as writing on paper support, provided that the person from whom it originates can be duly identified and it is established and preserved in conditions guaranteeing its integrity." Article 1367 specifies the conditions for validity of electronic signature: reliability of signatory identification and guarantee of act integrity.

eIDAS Regulation No. 910/2014 of the European Parliament: this regulation has direct application in French law and defines three signature levels (simple, advanced, qualified) and mandates mutual recognition of qualified electronic signatures within the European Union. In 2024, the eIDAS 2.0 revision (EU Regulation 2024/1183) strengthened identity requirements with the introduction of the European digital identity wallet (EUDI Wallet), whose deployment in France is planned for late 2026.

Decree No. 2005-973 of August 10, 2005: relating to the electronic authentic deed, it establishes the basis for notarial qualified signature and the REAL infrastructure. Supplemented by CSN orders governing security conditions and signature creation devices used by notaries.

ELAN law of November 23, 2018 (article 20) and decree No. 2020-395 of April 3, 2020: legalize remote appearance before a notary, govern the conditions of notarial videoconference and clarify notary obligations regarding remote identity verification.

Article L. 271-1 of the Construction and Housing Code: governs the 10-day withdrawal period for non-professional buyers and notification methods (applicable electronically under traceability conditions).

ETSI EN 319 132 standard: European standard defining technical requirements for advanced electronic signatures (XAdES) used in professional and institutional exchanges.

GDPR No. 2016/679: the collection of biometric data (facial recognition) within identity verification for electronic signature constitutes processing of special category personal data (article 9 GDPR). The data controller must have an explicit legal basis and conduct a prior impact assessment (DPIA). Electronic signature providers must ensure GDPR compliance of their identity verification processing.

Legal risks in case of non-compliance

Use of non-compliant electronic signature on a sales agreement exposes to several risks: nullity of the pre-contract for formal defect in case of dispute, inability to assert proof of signature before civil courts, professional liability of the real estate agent or notary for failure to advise, and loss of deposits or immobilization compensation if the agreement is contested. It is imperative to ensure the chosen platform provides a proof report (or "proof file") archived and opposable to third parties, comprising: unique document identifier, qualified timestamp, cryptographic fingerprint (SHA-256 hash or higher), log of actions by each signatory.

Usage scenarios: electronic signature of agreements in practice

Scenario 1 — An independent real estate agency handling 150 to 200 agreements annually

An intermediate-sized real estate agency, with 5 to 8 negotiators, previously managed all its agreements in paper format. Each file required on average 45 minutes of administrative work (printing, initialing, registered sending, filing), often supplemented by follow-ups to obtain signed documents from buyers and sellers not residing locally.

After deploying an eIDAS-compliant advanced electronic signature solution, the agency observed a reduction in average signature collection time from 8 days to less than 48 hours. The rate of returned incomplete files (forgotten initial, missing page) fell from 22% to less than 2%. The logistical cost per file (paper, registered mailings, archiving) decreased by 70%. The agency also leveraged this modernization as a commercial argument with a clientele of first-time buyers and active online investors.

Scenario 2 — A real estate developer managing VEFA projects on multiple simultaneous programs

A real estate developer undertaking 3 to 5 housing programs in parallel, representing between 80 and 150 reservations annually, faced complex geographic coordination challenges: local, regional and foreign resident buyers, associated with coordinating notaries across multiple offices.

By deploying a qualified electronic signature solution integrated with its business CRM tool via API, the developer was able to centralize management of reservation contracts and electronic authentic deeds. The timeline for finalizing VEFA sales deeds was reduced by an average of 30%. Documentation compliance (mandatory technical annexes, descriptive notices) was automated via pre-configured templates. The developer also reduced travel expenses related to signings by 45% over a fiscal year, leveraging remote notarial signing for expatriate clients. Our AI contract generator can also facilitate drafting of standard documents in this context.

Scenario 3 — A network of independent real estate agents without physical office

A network of independent agents operating exclusively digitally, without physical office, needed an entirely mobile solution, accessible from smartphone or tablet, to finalize pre-contracts directly during viewings or remotely.

By adopting a mobile-first SaaS platform with integrated identity verification by NFC (reading the chip from national ID card or biometric passport) and advanced signature by OTP SMS, the network reduced its abandonment rate between accepted offer and signed agreement from 18% to less than 5%. The speed of processing and fluidity of customer journey improved the Net Promoter Score (NPS) by +22 points over 12 months. Agents also benefited from access to standardized contract templates legally up-to-date, reducing risks of non-compliant drafting.

Conclusion

Electronic signature of the real estate sales agreement is today a legally solid reality, provided appropriate signature levels are observed for the type of deed: advanced signature for pre-contracts under private deed, qualified signature for notarial authentic deeds. The eIDAS regulation and articles 1366-1367 of the Civil Code provide a robust framework, reinforced by the rise of notarial remote signing and compliant SaaS platforms.

Choosing the right solution is decisive: user experience, regulatory compliance, probative archiving and business integrations are the differentiating criteria. Certyneo offers an electronic signature solution specifically adapted to real estate challenges, eIDAS-compliant, certified and equipped with expert support.

Ready to digitalize your sales agreements with complete security? Start your free trial on Certyneo or contact our team for personalized support.