The verdict in three sentences
For a 30-lawyer firm, the real question is not the licence price but billable time leakage, often estimated at 10 to 15% of revenue. Off-the-shelf software (60 to 150 EUR per user per month, Clio and its peers) is enough as long as your processes follow the standard; custom development (60,000 to 150,000 EUR excluding VAT) pays off within 2 to 3 years when time capture, conflict checks and billing must fit your organisation. In between, a customised vendor product is a compromise that costs more than advertised from year three.
What each option costs over 5 years
The figures below are 2026 estimates for a firm of 30 lawyers and 10 support staff (assistants, accounting, management), so 40 users.
| Item | Off-the-shelf | Customised vendor | Custom build |
|---|---|---|---|
| Annual licence or subscription | 29,000 to 72,000 EUR | 40,000 to 85,000 EUR | 0 EUR |
| Setup, data migration | 5,000 to 15,000 EUR | 20,000 to 45,000 EUR | included |
| Initial development | 0 EUR | 15,000 to 40,000 EUR of configuration | 60,000 to 150,000 EUR |
| Annual hosting and maintenance | included | included | 9,000 to 22,000 EUR |
| Cumulative 5-year cost | 150,000 to 375,000 EUR | 235,000 to 510,000 EUR | 105,000 to 260,000 EUR |
| Code ownership | no | no | yes |
| Go-live time | 4 to 8 weeks | 3 to 5 months | 5 to 8 months |
Off-the-shelf software is unbeatable in year one. Custom software takes the lead from year three, especially above 35 users, because cost no longer grows with every new partner or associate you hire.
The modules that drive profitability
Not all modules weigh the same. For a business law firm, four building blocks deliver most of the return on investment.
| Module | Problem solved | Estimated measurable gain | Priority |
|---|---|---|---|
| Time capture (timer, mobile, Outlook) | forgotten time, Friday-night entry | +6 to +10% billed time | 1 |
| Fee billing (fixed, hourly, success fee) | invoices issued 30 to 45 days late | issuance cut to 5 days | 1 |
| Conflict checks | manual searches in spreadsheets | check in under 2 minutes, logged | 2 |
| Court e-filing connector (RPVA in France) | manual downloads and filing | 20 to 40 min saved per lawyer per week | 2 |
| Document management | multiple versions, scattered emails | document search time divided by 3 | 3 |
| Partner dashboard | profitability per matter unknown | realisation rate visible monthly | 3 |
The conflict check module is an ethical obligation: it must query clients, adverse parties, related companies and past matters, with an audit trail you can show the bar. This is often where standard tools disappoint firms that work with groups with many subsidiaries.
When to go custom
Custom software makes sense if at least three of these conditions apply: more than 30 users, mixed billing models (fixed fee plus hourly plus success fee), clients demanding activity reports in their own format, a need to integrate with your existing accounting and document management, or a growth strategy based on hiring partners. Conversely, a firm with fewer than 10 lawyers and standard processes should stay with an off-the-shelf tool.
The data handled is covered by legal privilege: hosting in a certified European data centre, encryption at rest, strong authentication and access logs are requirements to write into the specification.
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Mr Laurent, managing partner of a 30-lawyer firm in central Paris, bills 9 million EUR a year. A time audit reveals 12% leakage: 1,080,000 EUR of work not recorded or not billed. Custom software at 120,000 EUR plus 15,000 EUR annual maintenance aims to recover only a third of that leakage, i.e. 360,000 EUR a year. Even with a cautious assumption of 150,000 EUR recovered in year one, the investment is covered in under 12 months, and the 3-year cumulative cost (165,000 EUR) remains below 40 premium licences over the same period (about 216,000 EUR).
FAQ
How much does law firm management software cost in 2026?
Off-the-shelf software costs 60 to 150 EUR per user per month, so 29,000 to 72,000 EUR a year for 40 users. Custom development ranges from 60,000 to 150,000 EUR excluding VAT, plus 9,000 to 22,000 EUR of annual maintenance.
Can custom software connect to court e-filing systems?
Yes, through the official e-filing flows and automatic retrieval of notices and documents, provided you meet the bar's technical prerequisites. Budget 8,000 to 15,000 EUR for this connector in a custom project.
How long does a custom deployment take?
Between 5 and 8 months for a 30-lawyer firm, including 6 to 8 weeks of scoping and a pilot with a team of 5 lawyers. A first release with time capture and billing can ship in 3 months.
Can we migrate history from our current software?
Yes, migrating clients, matters, time entries and invoices from the last 5 to 10 years is standard. It represents 5 to 10% of the budget and is tested on a copy before switchover.
What is a realistic payback period?
For a 30-lawyer firm, break-even against off-the-shelf software is 2 to 3 years, and often under 12 months once you count recovering part of the 10 to 15% billing leakage.
Let's scope your project. Send us your firm size, billing models and current tools: we will price a scope between 60,000 and 150,000 EUR with a 5 to 8 month plan. 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.
