The verdict in three sentences
A custom construction site management web app costs between EUR 15,000 and 34,000 in 2026 (10 to 22 million FCFA) for 12 to 18 weeks of development by our team, where London agencies typically quote two to three times more. The features that truly change a contractor's daily routine are offline mode, geotagged, timestamped photos and a daily PDF report generated in two minutes. For a contractor running 15 sites through WhatsApp and spreadsheets, the gain is about 8 hours a week per site manager.
Module-by-module pricing in 2026
Budget depends on the number of roles (management, site managers, foremen, subcontractors), reporting depth and accounting integrations. Here are 2026 ballpark figures.
| Module | Scope | Indicative 2026 price | Timeline |
|---|---|---|---|
| Site records and planning | Work packages, milestones, crews, Gantt | EUR 3,000 to 5,300 (2 to 3.5M FCFA) | 3 weeks |
| Offline field app | Data entry without signal, deferred sync | EUR 3,800 to 7,600 (2.5 to 5M FCFA) | 4 weeks |
| Geotagged photos | GPS, timestamp, annotation, compression | EUR 1,500 to 3,000 (1 to 2M FCFA) | 2 weeks |
| Daily PDF report | Headcount, weather, progress, incidents | EUR 1,800 to 3,800 (1.2 to 2.5M FCFA) | 2 weeks |
| Materials and procurement tracking | Delivery notes, stock per site | EUR 2,300 to 5,300 (1.5 to 3.5M FCFA) | 3 weeks |
| Management dashboard | Progress, budget variance, delay alerts | EUR 2,000 to 4,600 (1.3 to 3M FCFA) | 2 weeks |
| Snagging and close-out | Snag list, before and after photos | EUR 750 to 3,800 (0.5 to 2.5M FCFA) | Optional |
A first field version (sites, offline, photos, report) starts around EUR 15,000. The full scope with materials, snagging and dashboard reaches EUR 27,000 to 34,000.
WhatsApp, off-the-shelf software or custom app?
Construction SaaS tools exist, but they are billed per user per month and rarely match a contractor's own report formats and subcontractor practices.
| Criterion | WhatsApp + Excel | Off-the-shelf construction SaaS | Custom app |
|---|---|---|---|
| Upfront cost | EUR 0 | EUR 0 to 1,500 | EUR 15,000 to 34,000 |
| Annual cost (40 users) | Lost time | EUR 14,000 to 27,000 | EUR 2,300 to 5,000 maintenance |
| Offline operation | Partial | Variable | Full |
| Daily reports | Manual, 45 min | Standardised | Your template, 2 min |
| Photo traceability | Lost in chats | Good | GPS, date, site, package |
| Subcontractor fit | No | Limited | Total |
| Data ownership | Scattered | Vendor | Company |
Over three years, a custom app is generally cheaper than per-user software from 30 to 40 active accounts.
What to define before development starts
- The daily report template: start from the existing paper report, management must recognise it.
- Access rights: a subcontractor only sees their package, the client a filtered weekly report.
- Photo size: automatic compression to 300 KB so 50 photos a day upload on weak mobile signal.
- Devices: include entry-level Android phones in testing, around EUR 120 to 180 each.
- Training: 2 half-days per crew, on site, with one champion per site.
Mini case study
James, operations director of a London contractor, oversees 15 sites with 6 site managers. Each spends about 8 hours a week compiling WhatsApp photos, calls and spreadsheets into reports.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
He orders an app at EUR 23,000 (offline, geotagged photos, PDF report, dashboard). Gain: 6 site managers × 8 h × 46 weeks × EUR 45 loaded hourly cost = EUR 99,360 a year of time returned to the field. Add fewer delay penalties: avoiding a single 10-day delay on a EUR 2 million contract with 0.1% daily liquidated damages saves EUR 20,000. Payback in under 3 months, including EUR 3,450 of annual maintenance.
FAQ
Does the app work without internet on site?
Yes, offline mode stores entries and photos on the phone and syncs as soon as signal returns. It accounts for EUR 3,800 to 7,600 of the budget and is the most important module.
How long to roll out across 15 sites?
Allow 12 weeks of development for the field version, then 3 to 4 weeks of phased rollout starting with 2 pilot sites.
Can the app connect to our accounting software?
Yes, an export or sync with Sage, Xero or Odoo usually costs EUR 2,300 to 4,600 extra.
Do foremen need new smartphones?
Often yes, budget EUR 120 to 180 per Android device and a data plan of EUR 10 to 20 a month.
Is the data secure?
Encrypted hosting, daily backups and role-based access are included. UK GDPR compliance is built in from the design stage.
Let's scope your project. Tell us your number of sites, users and current report template: we will price an app between EUR 15,000 and 34,000 with a rollout 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.
