The verdict in three sentences
Custom legal software in Paris budgets around 35,000-60,000 EUR excl. tax for the core (cases, calendar, billing), plus 15,000-30,000 EUR for advanced modules. Return on investment comes from template-based document generation — 5 to 10 h/week recovered per lawyer — and from security: a dedicated tool protects professional secrecy better than a shared SaaS. You're not buying software, you're buying an asset shaped to your litigation, advisory or notarial processes.
Breaking down the core budget
The core covers what every firm needs from day one. Here's the indicative 2026 split for a Paris firm.
| Core component | 2026 budget |
|---|---|
| Case + party management | 10,000-16,000 EUR |
| Calendar, deadlines and hearings | 6,000-10,000 EUR |
| Time billing + fees | 8,000-14,000 EUR |
| Full-text search and tags | 4,000-8,000 EUR |
| Role-based permissions | 4,000-7,000 EUR |
| Legacy data migration | 3,000-8,000 EUR |
This 35,000-60,000 EUR excl. tax core ships in 3 to 4 months. It's the base on which the modules that differentiate your firm are stacked.
Advanced modules and their ROI
Advanced modules turn a management tool into a productivity engine. Each is justified by a measurable gain.
| Module | 2026 cost | Main gain |
|---|---|---|
| Document automation | +7,000-14,000 EUR | 5-10 h/week/lawyer |
| Integrated e-signature | +4,000-8,000 EUR | -3 days per case |
| Encrypted digital vault | +6,000-12,000 EUR | Compliance + secrecy |
| HDS/EU hosting | +2,000-5,000 EUR/yr | Data sovereignty |
| Partner dashboard | +5,000-9,000 EUR | Real-time steering |
A lawyer billed at 180 EUR/h who recovers 7 h/week through document automation frees up 1,260 EUR/week of capacity, i.e. over 50,000 EUR/yr of productive time per lawyer.
Why custom protects secrecy better
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A shared SaaS hosts your cases in a common database. Custom enables dedicated HDS or EU hosting, encryption of sensitive documents, and full access traceability. For a litigation firm handling sensitive cases, that watertightness isn't a luxury: it's an ethical obligation you control end to end.
Mini case study
Ms. Lefèvre, director of a 9-lawyer firm in the 8th arrondissement, budgets a core at 48,000 EUR excl. tax plus a document automation module at 11,000 EUR and e-signature at 6,000 EUR, i.e. 65,000 EUR excl. tax. Her 9 lawyers each recover on average 6 h/week. At 180 EUR/h, that's 9,720 EUR/week of productive capacity, roughly 437,000 EUR/yr. Even converting only 20 % of that time into real fees, the firm generates 87,000 EUR/yr — the investment is repaid in under ten months.
FAQ
Can we start with the core and add modules later? Yes, it's actually recommended. Ship the 35,000-60,000 EUR core, measure adoption, then add document automation the next quarter.
Is e-signature legally valid? Yes, with an eIDAS-compliant provider. The module integrated into your tool avoids email back-and-forth and cuts a signature cycle from several days to a few hours.
Where is the data hosted? With an HDS or EU-based host, depending on your sovereignty requirement. Budget 2,000 to 5,000 EUR/yr for dedicated, backed-up hosting.
What does annual maintenance cost? Maintenance runs 15 to 20 % of build cost per year, i.e. 10,000 to 13,000 EUR for a 65,000 EUR project. It covers fixes, evolutions and security.
Timeline for a full project? Budget 4 to 6 months for a core plus two advanced modules, with interim deliveries every 3 to 4 weeks.
Let's scope your project. Tell us your dominant activity (litigation, advisory, notarial), your headcount and your two priority modules: we'll frame the scope and an indicative budget. 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.
