The verdict in three sentences
A custom case management web app for a law firm costs between USD 35,000 and 80,000 in 2026, depending on the depth of document management and time-based billing. Budget 12 to 18 weeks of development and about USD 500/month in maintenance. Against off-the-shelf practice software (Clio, MyCase) billed at USD 60-130 per user per month, custom becomes relevant beyond 8-10 users or when your approval workflows fall outside the standard mold.
What the budget covers
A partner isn't buying software: they're buying billable hours that stop leaking and deadlines that never slip. Here is the cost structure for a New York project in 2026.
| Item | Scope | Range USD |
|---|---|---|
| Discovery and UX | Partner, associate, assistant journeys | 4,000 - 8,000 |
| Document management | Matter tree, versioning, search | 8,000 - 17,000 |
| Calendar and deadlines | Court dates, alerts, reminders | 6,000 - 12,000 |
| Time tracking | Time entry, hourly rates, approval | 7,000 - 14,000 |
| Time-based billing | Fees, retainers, follow-ups | 7,000 - 16,000 |
| Integrations (accounting, e-filing, e-sign) | APIs, connectors | 3,500 - 10,000 |
| UAT, rollout, training | Testing, go-live, onboarding | 3,500 - 9,000 |
A workable core (document management + calendar + time tracking) fits in USD 40,000-55,000. The upper band funds full time-based billing with retainers, automated follow-ups and an accounting connector.
Custom vs practice software: when to switch
Market platforms are excellent to start, but their per-user cost climbs and their workflows stay rigid. Here is the comparison over 12 users and 3 years.
| Scenario | Practice software USD 100/user/mo | Custom app |
|---|---|---|
| Upfront investment | Setup USD 6,000 | USD 58,000 |
| Monthly cost (12 users) | USD 1,200 | USD 500 (maintenance) |
| 36-month total | USD 49,200 | USD 76,000 |
| Approval workflows | Standard | Custom |
| Data ownership and export | Constrained | Full |
| Billable hours recovered | Low | Significant |
Over 36 months practice software stays cheaper to buy, but custom pays back through recovered billable hours: a firm losing even 2% of unrecorded hours on USD 3M in fees leaves USD 60,000 a year on the table.
Mini case study
David is a partner at a 12-person firm in New York, USD 3M in annual fees. His associates record time inconsistently and he estimates the leak at 3%. He invests USD 58,000 in a custom app plus USD 500/month maintenance. Over the year: time entry becomes systematic, the leak drops from 3% to under 1% - USD 60,000 in fees recovered - and no court deadline missed. Payback lands in under 14 months.
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FAQ
Does the app respect confidentiality and data protection rules?
Yes, US-based hosting, encryption, access logging and fine-grained per-matter permissions are included in the core.
Can it connect to e-filing and our accounting system?
Interconnections are possible via dedicated connectors, budget USD 3,500-10,000 depending on the target systems.
How long to a usable first version?
A document-management plus calendar core can ship in 8-10 weeks, with full time-based billing following on a 12-18 week total.
Can we migrate our existing matters?
Yes, a data migration from your current tools is quoted separately based on volume and source data quality.
How much is maintenance?
Budget around USD 500/month, or USD 6,000/year, covering fixes, monitoring and small evolutions.
Let's scope your project. Send us your user count, annual fee volume and current tools, and we'll price a core in the USD 35,000-80,000 range. 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.
