The verdict in three sentences
A custom business web application to replace Excel files budgets at 35,000-65,000 EUR in 2026, delivered in 14 to 22 weeks. The cost concentrates in three modules: structured data entry, validation workflow, reporting. The return on investment comes from ending double entry (-50%) and from reliable, auditable data shared in real time.
The cost breakdown
A business application is not a website: it is an internal production tool. Here is the typical breakdown for an SMB (2026 estimate, order of magnitude).
| Item | Content | Budget (EUR) |
|---|---|---|
| Scoping | Workshops, data modeling, mockups | 4,000 |
| Data-entry module | Forms, validations, Excel import | 8,000 - 16,000 |
| Workflow module | Approval flows, statuses, notifications | 9,000 - 20,000 |
| Reporting module | Dashboards, filters, KPIs | 8,000 - 14,000 |
| Roles & permissions | Profiles, granular access | 4,000 |
| Exports & API | CSV/Excel, connection to your tools | 3,000 |
| Total | Operational application | 35,000 - 65,000 |
The workflow is often the heaviest item because it encodes your business rules: it is also the one that delivers the most value.
In-house team vs agency vs low-code
Three paths exist to build the tool. Each has a distinct cost and risk profile.
| Approach | 2026 cost | Timeline | Risk |
|---|---|---|---|
| In-house (hire a dev) | 55,000 - 90,000 EUR/year | Long | Turnover, maintenance |
| Custom agency | 35,000 - 65,000 EUR | 14-22 wks | Low with solid scoping |
| Assisted low-code | 20,000 - 40,000 EUR | 8-14 wks | Ceilings, platform lock-in |
Low-code fits simple needs and a tight budget. As soon as the workflow becomes specific or performance matters, the custom agency offers the best durability/cost ratio. In-house only makes sense if the software is your lasting core business.
Mini case study
Herve runs a 30-employee building-materials trading SMB. His supplier order management runs on 6 shared Excel files, a source of errors and double entry. He invests 48,000 EUR in a business application (scoping 4,000, data entry 12,000, workflow 18,000, reporting 10,000, permissions 4,000). Result: re-keying drops from 12 hours/week to 5 hours (-58%), i.e. about 7 hours saved x 45 weeks x 28 EUR = 8,800 EUR/year in direct savings, plus the end of stock errors. The application pays for itself in about 3 years on productivity alone, not counting the recovered data reliability.
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FAQ
Why not just stay on Excel?
Excel hits a ceiling once several people edit, rules get complex and traceability matters. Excel's hidden cost (errors, double entry, no history) quickly exceeds that of a dedicated application.
How long to develop the application?
Expect 14 to 22 weeks for a complete business application in 2026, scoping included. A first usable module can ship in 6-8 weeks to prove value early.
Can we import our existing Excel data?
Yes, Excel/CSV import is part of the data-entry module (included in the 8,000-16,000 EUR). It is even a prerequisite for adoption: nobody re-keys everything by hand.
Should we handle roles and permissions from the start?
Yes for any multi-user application: the roles/permissions module (4,000 EUR) secures access and holds each profile accountable. It is essential from 3-4 users.
What maintenance budget should we plan?
Expect 12-18% of the build cost per year in maintenance, i.e. about 5,000-10,000 EUR/year for a 50,000 EUR application. That covers fixes, changes and hosting.
Let's scope your project. List the Excel files to replace, your approval flows and an indicative budget, and we will price a modular business application delivered in 14-22 weeks. 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.
