The verdict in three sentences
A custom construction app ranges from 35,000 to 100,000 EUR excl. VAT in 2026, depending on offline mode, scheduling depth and integration with the construction ERP/accounting. The ROI comes from fewer overruns and delays thanks to reliable site tracking from the field. Plan for 4 to 8 months of project work.
Modules and budget of a construction app
A construction project management app connects the office and the field: schedules, progress, daily reports, photos, time tracking and cost feedback. Offline mode is structural: on site, connectivity is often absent. The budget follows the number of modules and integration with the management system.
| Module | Scope | 2026 ballpark (EUR excl. VAT) |
|---|---|---|
| App core + project management | Sites, teams, roles | 8,000 - 15,000 |
| Scheduling & progress | Gantt, milestones, resources | 7,000 - 16,000 |
| Offline mode (PWA/mobile) | Field entry, deferred sync | 8,000 - 20,000 |
| Photos & geolocation | Reports, timestamping, plans | 5,000 - 12,000 |
| Daily reports & time tracking | Hours, weather, incidents | 4,000 - 10,000 |
| ERP / accounting integration | Costs, purchasing, billing | 8,000 - 22,000 |
A construction director managing 10 to 25 simultaneous sites typically targets a scheduling + offline + accounting-integration core, a realistic envelope of 60,000 to 85,000 EUR excl. VAT.
Field mobile, ERP integration and ROI on delays
The real differentiator is field-data reliability. Synced offline entry, timestamped and geolocated photos and real-time tracking give an exact view of progress and costs.
| Item | Paper / Excel tracking | With custom app |
|---|---|---|
| Budget overruns (baseline) | 100 % | -15 % |
| Site-incident reporting time | 1 to 3 days | Immediate |
| Time-tracking reliability | 80 to 88 % | 96 to 99 % |
| Subcontractor billing disputes | Frequent | -30 to -40 % |
| Weekly reporting time / site | 3 to 5 h | 30 to 60 min |
On a site, an overrun detected two days earlier instead of two weeks means a cheaper fix. That is where the app pays off fastest.
Mini case study
Samir, head of a structural-works firm in Toulouse, manages 18 sites for 9 M EUR/year of turnover. Overruns averaged 4 % of volume, i.e. 360,000 EUR/year. With a 72,000 EUR app cutting overruns by 15 %, he saves about 54,000 EUR/year, before counting reporting time divided by five (about 0.4 FTE). Return on investment is reached in under 18 months.
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FAQ
How long to deliver a construction app?
Plan for 4 to 8 months: 1 month of scoping, 3 to 6 months of development (offline mode is often the longest part), then a pilot on one or two sites before rollout.
Is offline mode really necessary?
Yes, on most sites connectivity is intermittent. Offline entry with deferred sync represents 8,000 to 20,000 EUR excl. VAT but drives field adoption.
Can it integrate our accounting or construction ERP?
Yes, via API or middleware. Integration represents 8,000 to 22,000 EUR excl. VAT depending on flows (costs, purchasing, billing, payroll) and the vendor.
Web app or native mobile app?
A PWA (installable web) covers 90 % of field needs at lower cost. Native is justified for intensive offline use or advanced hardware functions.
What concrete gain on overruns?
2026 feedback shows a 10 to 15 % drop in overruns thanks to early gap detection and more reliable time and cost tracking.
Let's scope your project. Tell us your number of sites, your ERP/accounting and your target budget (35,000 to 100,000 EUR excl. VAT) and we'll frame offline mode, scheduling and integration. 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.
