The verdict in three sentences
Custom legal case management software costs GBP 45,000 to 110,000 in 2026, versus GBP 35 to 90 per user per month for a vertical SaaS. Custom wins when the firm has complex billing models (hourly, fixed-fee, contingency) and needs strict conflict checking and trust accounting. The real gain: turning admin hours into billable hours.
The scope of matter management software
The core covers the matter lifecycle: opening with conflict checks, court-deadline calendar, time recording per fee earner, disbursements, billing and receivables, all linked to accounting and trust accounts.
| Module | Custom (one-off) | Legal SaaS (per month) | Key stake |
|---|---|---|---|
| Matter mgmt + conflicts | GBP 10,000 - 22,000 | included | zero missed conflict |
| Court-deadline calendar | GBP 7,000 - 15,000 | GBP 9 - 17/user | zero missed deadline |
| Time recording | GBP 6,000 - 14,000 | GBP 11 - 19/user | +billed hours |
| Multi-model billing | GBP 8,000 - 18,000 | GBP 8 - 15/user | -25 % unpaid |
| Trust/client accounting | GBP 8,000 - 20,000 | GBP 10 - 18/user | SRA compliance |
| Document mgmt + portal | GBP 7,000 - 16,000 | GBP 9 - 16/user | confidentiality |
Custom vs legal SaaS: three-year trade-off
Vertical SaaS starts fast but per-seat cost climbs and billing stays rigid. Custom mirrors your billing rules and professional-conduct requirements.
| Criterion | Custom | Legal SaaS |
|---|---|---|
| Upfront cost | GBP 45,000 - 110,000 | GBP 0 - 3,000 |
| 3-year cost (15 users) | GBP 55,000 - 125,000 | GBP 18,900 - 48,600 |
| Custom billing | Total | Fixed models |
| Conflict control | Firm-specific | Standard |
| GDPR compliance | By design | Vendor-dependent |
| Timeline | 4 - 6 months | 3 - 8 weeks |
Mini case study
Sarah is a partner at a 12-lawyer firm in London. The firm estimates 5 hours per lawyer per week of unrecorded or under-billed time. At an average rate of GBP 250, that is 12 × 5 × 250 = GBP 15,000/week of potential lost revenue, roughly GBP 660,000/year (2026 order of magnitude). Custom software at GBP 85,000 that recovers even 20 % of that billable time frees up GBP 132,000/year: payback in under 8 months.
FAQ
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How are conflicts of interest handled?
When a matter is opened, the system checks parties, opponents and beneficial owners against the existing base and blocks or alerts on a collision. The rule is configurable to your conduct requirements.
Does it support multiple billing models?
Yes: hourly, fixed-fee, contingency, with retainers and disbursements. Custom is precisely where vertical SaaS shows its limits.
What GDPR compliance for sensitive data?
Regional hosting, encryption, audit logging, data minimisation and retention management. Privilege requires fine-grained per-matter access control.
Can I connect my accounting and trust ledger?
Yes, via API or standardised export. Invoices and receipts flow without re-keying, cutting errors and delays, with SRA-style trust rules supported.
How long for a production V1?
4 to 6 months. Time recording and billing usually ship first because they carry most of the ROI.
Let's scope your project. Tell us your headcount, billing models and accounting tool; we frame a V1 with 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.
