The verdict in three sentences
A law firm needs to run matters, time, billing and confidentiality in a setting where professional privilege and GDPR are non-negotiable. A legal SaaS (30 to 70 EUR per lawyer per month) covers the standard; a custom build (45,000 to 130,000 EUR) wins when conflict-of-interest management, the document vault or granular time billing become strategic. The biggest ROI is billing the time actually spent, often under-reported by 10 to 20 %.
Legal SaaS vs custom: the 2026 comparison
| Criterion | Legal SaaS | Custom build |
|---|---|---|
| Entry cost | 30 - 70 EUR/lawyer/month | 45,000 - 130,000 EUR |
| Timeline | 3 - 8 weeks | 5 - 9 months |
| Conflict-of-interest checks | Basic | Dedicated engine |
| Vault / confidentiality | Standard | Bespoke, encryption |
| Time billing | Predefined | Firm rules |
| Hosting | Shared | Your choice (EU) |
| Code ownership | No | Yes |
Modules and cost per lawyer
2026 order of magnitude for a 12-lawyer firm.
| Module | Business value | Custom budget weight |
|---|---|---|
| Matter management | System core | 20 - 30 % |
| Time tracking | Accurate billing | 15 - 25 % |
| Billing & fees | Cash flow | 15 - 20 % |
| Conflict of interest | Ethics compliance | 10 - 15 % |
| Document vault | Professional privilege | 10 - 15 % |
| Secure client portal | Client relationship | 10 - 15 % |
At 55 EUR/lawyer/month, 12 lawyers cost 7,920 EUR/year in licences; 39,600 EUR over 5 years. A custom build at 85,000 EUR pays off mainly through recovered billing from better-tracked time.
Mini case study
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Me Lefevre, partner at a 12-lawyer firm in Lyon, reckoned he lost 12 % of fees to loose time tracking. A custom case management tool at 88,000 EUR, with mobile time entry and automatic billing, lifted the billing rate: on 2.4 M EUR revenue, recovering 6 points is roughly 144,000 EUR per year. Payback within the first year, before any admin productivity gains.
FAQ
Must legal software be hosted in Europe? For professional privilege and GDPR, EU hosting is strongly advised. Custom lets you pick a sovereign host and encryption at rest; SaaS varies by vendor.
How are conflicts of interest handled? An engine cross-checks parties, opponents and matters at intake to raise an alert. In custom builds it adapts to your precise ethics rules, which few standard SaaS offer.
What is the real billing gain? Firms often under-report 10 to 20 % of billable time. Rigorous mobile tracking recovers much of it, which alone funds the project in many cases.
What is the timeline for custom case management? Plan 5 to 9 months depending on modules. The matters + time core can ship in 12 to 16 weeks, with billing and portal after.
Can existing matters be migrated? Yes, via data import from the old tool or files. Budget 6,000 to 20,000 EUR for migration depending on volume and source data quality.
Let's scope your project. Tell us your lawyer count, priority modules and confidentiality requirements: we cost SaaS vs custom and the billing ROI. 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.
