The verdict in three sentences
A secure extranet for a law firm costs between USD 16,000 and USD 49,000 in 2026, depending on the granularity of rights management, the level of encryption and audit-logging requirements. The timeline runs 10 to 16 weeks, with maintenance of USD 380 to 870 per month. For a firm handling confidential documents, it is as much a security investment as a productivity one.
Cost per role and per security requirement
In a firm, the partner, the associate, the secretariat and the end client do not share the same rights. Fine-grained role management is the heart of the 2026 estimate.
| Development item | 2026 cost (USD) | Indicative timeline |
|---|---|---|
| Extranet core + MFA authentication | 5,400 - 9,800 | 3-4 weeks |
| Granular roles and permissions management | 4,300 - 8,700 | 2-4 weeks |
| Document encryption (at rest + in transit) | 2,700 - 6,000 | 2-3 weeks |
| Logging / time-stamped audit trail | 3,300 - 6,500 | 2-3 weeks |
| Matter tracking + per-case timeline | 3,800 - 8,100 | 3-4 weeks |
| Secure client-lawyer messaging | 2,700 - 5,400 | 2 weeks |
A mid-sized firm targeting core + roles + encryption + matter tracking lands around USD 24,000 to 33,000. Adding full logging and secure messaging pushes toward USD 41,000 to 49,000.
Sovereign hosting and data-protection compliance
Attorney-client privilege demands strong guarantees. In 2026, most firms require hosting in a controlled jurisdiction, out of reach of extraterritorial legislation.
| Requirement | Chosen option | 2026 cost |
|---|---|---|
| Hosting | Sovereign cloud, ISO 27001 certified | USD 65 - 220/month |
| Encryption | AES-256 at rest, TLS 1.3 in transit | Included in dev |
| Compliance logging | Time-stamped logs, 6-12 month retention | USD 3,300 - 6,500 (dev) |
| Processing register | Documentation + DPA | USD 1,600 - 3,300 |
| Security audit (pentest) | Penetration test before go-live | USD 3,800 - 7,600 |
| Encrypted backups | Daily, 30-day retention | USD 33 - 87/month |
A security audit (pentest) before go-live is strongly advised: it costs USD 3,800 to 7,600 but prevents incidents that would be far more costly to a firm's reputation.
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Mini case study
Ms. Bennett, partner at a 12-lawyer firm in Manhattan. The firm exchanges about 900 documents a month with its clients, mostly via unsecured email and mail. Preparation, sending and filing take roughly 130 hours/month for the secretariat. With a matter-tracking extranet, this time drops by 45%, i.e. ~58 hours/month saved, or 696 hours/year. Valued at USD 42/hour, that is USD 29,232/year. For an extranet at USD 33,000 plus USD 6,500/year of maintenance, payback is reached in about 16 months, not counting the reduced data-breach risk.
FAQ
How is privilege guaranteed in an extranet? Through end-to-end encryption, strict rights management and complete logging. Sovereign hosting and a signed DPA with the vendor round out the setup.
Is a security audit needed before go-live? Strongly recommended. A pentest costs USD 3,800 to 7,600 and finds flaws before a third party exploits them; it is standard for a legal tool.
What is a realistic timeline? 10 to 16 weeks. Granular role management and logging are the longest items to specify and test properly.
Can the client sign online? Yes, via an eIDAS-equivalent integration. For sensitive deeds, qualified signature is preferred, with a per-signature cost of USD 1 to 3.
Can the extranet connect to our practice-management software? Yes, most legal vendors expose APIs in 2026. Integration costs between USD 4,300 and 9,800 depending on the synchronized flows.
Let's scope your project. Tell us your number of users, the roles to manage, your logging requirements and your budget, and we will frame the secure scope. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
