The verdict in three sentences
When a general contractor runs 80 subcontractors over email and WhatsApp, wrong drawing revisions and expired certificates cost more than the tool that prevents them. A custom subcontractor extranet costs 9,000,000 to 16,000,000 FCFA in our Abidjan benchmark (2026 market estimate, about 13,720 to 24,390 EUR), over 3 to 5 months; a Toronto build of the same scope will be quoted higher in CAD, but the modules and the business case are identical. Payback rests on an estimated saving of 6 hours per week per site manager, to be measured from the first pilot project.
What WhatsApp really costs on a job site
On an 8-storey residential building or a warehouse project, a site manager deals daily with 15 to 25 subcontractors. Drawings circulate as PDFs in WhatsApp groups, progress claims arrive by email in different formats, and compliance certificates (social security, tax, insurance; in Ontario, WSIB clearance) are checked at payment time, often too late.
| Current pain point | Frequency on an average project | Estimated 2026 cost |
|---|---|---|
| Work built on an outdated drawing | 1 to 2 times per quarter | 1,500,000 to 6,000,000 FCFA of rework per incident |
| Social security or tax certificate expired at payment | 10 to 20% of subcontractors | Payment blocked, 2 to 4-week delay |
| Progress claim disputed for lack of shared measurements | 3 to 5 per month | 2 to 4 h of meetings each |
| Searching for a document in WhatsApp or emails | Daily | 1 h per day per site manager |
| No traceability of closed snags | Permanent | Disputes at handover |
Modules and their market price
| Module | Function | 2026 market budget |
|---|---|---|
| Directory and permissions | Record per subcontractor, access per project, roles | 1,000,000 to 1,800,000 FCFA |
| Certificate upload | Social security, tax, liability insurance, alert before expiry | 1,200,000 to 2,000,000 FCFA |
| Versioned drawings | Revision index, notification, mandatory read receipt | 2,000,000 to 3,500,000 FCFA |
| Progress claims | Entry per trade package, % complete, site manager approval, accounting export | 2,300,000 to 4,200,000 FCFA |
| Snags and close-outs | Geotagged photo from mobile, status, date | 1,500,000 to 2,800,000 FCFA |
| Management dashboard | Progress, committed amounts, administrative compliance | 1,000,000 to 1,700,000 FCFA |
The extranet must run on entry-level Android smartphones with an unstable 3G connection on site. Offline entry with deferred photo sync is the most often underestimated module: add 10 to 15% to the budget for this constraint.
Three scenarios by company size
| Scenario | Scope | Budget | Timeline |
|---|---|---|---|
| Document core | Directory, certificates, versioned drawings | 9,000,000 to 10,500,000 FCFA | 3 months |
| Financial control | Core + progress claims + accounting export | 11,500,000 to 13,500,000 FCFA | 4 months |
| Full platform | Everything + offline mobile snags + dashboard | 14,000,000 to 16,000,000 FCFA | 5 months |
| Hosting and backups | Cloud with drawing and photo storage (200 to 500 GB) | 900,000 to 1,800,000 FCFA per year | Ongoing |
| Application maintenance | Fixes, updates, small changes | 75,000 to 120,000 FCFA per month | Ongoing |
For maintenance, Kolonell's Standard and Premium plans are 75,000 and 120,000 FCFA per month (about 110 and 180 EUR); a platform used across several simultaneous projects usually needs the Premium level.
Mini case study
Kouassi, fictional construction director of a general contractor in Abidjan, supervises 8 site managers with an average loaded monthly cost of 1,200,000 FCFA, about 6,900 FCFA an hour over 174 hours.
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Estimated saving: 6 hours × 8 site managers × 46 weeks = 2,208 hours a year, about 15,200,000 FCFA of recovered time. Counting only half as a real gain, 7,600,000 FCFA a year. Add a single outdated-drawing incident avoided per year, 3,000,000 FCFA of rework. With the full platform at 15,000,000 FCFA, plus 1,440,000 FCFA of maintenance and 1,200,000 FCFA of hosting per year, the net gain of about 7,960,000 FCFA a year pays back the investment in just under 2 years.
FAQ
Will subcontractors agree to use the extranet?
Yes if progress claims can only be paid through the tool. In practice, 70 to 80% of subcontractors adopt it within the first 2 months when the rule is set in the contract.
Why not use off-the-shelf construction software?
International SaaS tools often cost the equivalent of 30,000 to 60,000 FCFA per user per month and handle local compliance certificates poorly. For 30 internal users, custom becomes competitive within 2 to 3 years.
Does the extranet work without a connection on site?
Yes, with a progressive web app that stores entries and photos locally. Sync happens as soon as the network returns, usually in under 2 minutes for 20 photos.
Can we start with a single project?
That is the right method. A 6 to 8-week pilot on one project with 15 to 20 subcontractors lets you fix the journeys before general rollout.
Is subcontractor data protected?
In Côte d'Ivoire, Law 2013-450 on personal data requires a filing with ARTCI; in Ontario, PIPEDA applies. Access must be partitioned by project and trade package, with a login log.
Let's scope your project. Tell us the number of projects, subcontractors and your accounting tools: we will price the right scenario and a single-project pilot, with a 3 to 5-month schedule. 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.
