The verdict in three sentences
A construction leader must track progress, time, equipment and cost per site, often in areas with no network, which makes offline mode essential. A construction SaaS (25 to 60 EUR per field user per month) covers the standard; a custom build (50,000 to 150,000 EUR) wins when cost control and payroll/accounting integration become strategic. The main ROI: cutting site overruns by 12 to 18 %, straight onto the margin.
Construction SaaS vs custom: the 2026 comparison
| Criterion | Construction SaaS | Custom build |
|---|---|---|
| Entry cost | 25 - 60 EUR/field user/month | 50,000 - 150,000 EUR |
| Timeline | 3 - 8 weeks | 5 - 10 months |
| Offline mode | Variable | Full, native |
| Payroll/accounting integration | Standard, limited | Bespoke |
| Cost control | Predefined | Company rules |
| Field time tracking | Mobile app | Dedicated mobile app |
| Code ownership | No | Yes |
Cost per field user and margin ROI
2026 order of magnitude for a construction firm with 60 field users.
| Item | SaaS at 40 EUR/user/month | Custom 100,000 EUR |
|---|---|---|
| Year 1 cost | 28,800 EUR | 100,000 EUR + build |
| 5-year cost | 144,000 EUR | 100,000 EUR + 15 %/yr |
| Overrun reduction | Partial | -12 to -18 % |
| Payroll integration | Vendor package | 10,000 - 30,000 EUR |
| Evolution | Vendor roadmap | Your priorities |
Over 5 years, SaaS for 60 users exceeds 144,000 EUR in licences; a custom build at 100,000 EUR becomes competitive, especially if cutting overruns lifts site margin by several points.
Mini case study
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Karim, head of a 60-worker construction firm in Toulouse, ran average overruns of 14 % on his sites for lack of real-time cost tracking. A custom tool at 108,000 EUR, with offline time tracking, equipment monitoring and cost control, brought overruns down to 5 %. On 12 M EUR of works, recovering 9 overrun points is roughly 1.08 M EUR per year in avoided cost. Payback in under 2 months of operation.
FAQ
Is offline mode really essential? On many sites with no network, yes: time entry, photos and reports must work offline then sync. A custom build guarantees full native offline, where some SaaS remain limited.
Can payroll and accounting be integrated? Yes, via API or structured export. Budget 10,000 to 30,000 EUR depending on the incumbent tools; automating time entry into payroll removes hours of monthly re-keying.
How does per-site cost control work? Each site aggregates hours, equipment and purchases into a real cost compared to budget in real time, with drift alerts. It is the highest-ROI custom module.
What is the timeline for a custom site tool? Plan 5 to 10 months depending on scope. The time + progress core can ship in 12 to 16 weeks, with cost control and payroll integration after.
What overrun reduction can I expect? As a 2026 order of magnitude, rigorous tracking cuts overruns by 12 to 18 %, which on large works volumes funds the project within months.
Let's scope your project. Tell us your field-user count, payroll/accounting tools and works volume: we cost SaaS vs custom and the margin ROI. 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.
