The verdict in three sentences
Construction site management software sits between EUR 25-80/user/month for standard SaaS and EUR 50,000 to 140,000 for a custom build that fits your time-tracking, purchasing and subcontracting processes. For a London contractor with 20 to 60 site workers, custom pays off as soon as SaaS forces daily manual workarounds. The real stake isn't the licence price but cutting site overruns: targeting -20% extra costs and +2 points of margin is a credible 2026 goal.
SaaS or custom: the real 2026 comparison
SaaS is attractive at entry but bills per user: with 40 workers equipped, a EUR 45/month licence exceeds EUR 21,600/year, premium modules excluded. Custom flips the logic: high upfront cost, then low marginal cost per added user.
| Criterion | Standard construction SaaS | Custom build (Kolonell) |
|---|---|---|
| Entry cost | EUR 0-3,000 (setup) | EUR 50,000-140,000 |
| Recurring cost | EUR 25-80/user/month | Hosting EUR 150-600/month |
| Cost at 40 users/year | EUR 12,000-38,000 | ~EUR 5,000 (hosting) |
| Process fit | Limited to options | Total |
| Custom field time-tracking | Rarely included | Native |
| Local accounting integration | Generic connectors | Bespoke, exact |
| Code ownership | No | Yes |
| Go-live time | 2-6 weeks | 4-7 months |
The modules that drive the budget
The core (site planning, purchasing, budget tracking) is the base; field modules and integrations widen the price gap.
| Module | 2026 range (EUR ex. VAT) | Operational impact |
|---|---|---|
| Site management core | 50,000-90,000 | Planning, budget, progress |
| Field mobile app (time, photos) | +12,000-30,000 | Real-time capture, less re-keying |
| Accounting/payroll integration | +6,000-18,000 | No more double entry |
| Subcontracting & progress billing | +8,000-20,000 | Reliable progress invoicing |
| Offline mode (dead zones) | +5,000-14,000 | On-site capture without network |
| Per-site margin dashboard | +6,000-15,000 | Profitability steering |
Mini case study
Thierry runs a structural works company in London: 38 workers, 14 concurrent sites. In 2025 his overruns were 6% of site revenue, roughly EUR 210,000 on EUR 3.5M. He invests EUR 96,000 in custom software (core + field app + payroll integration), plus EUR 400/month hosting. Cutting overruns from 6% to 4.5% in year one saves EUR 52,500/year. Add 1.5 points of margin regained through real-time steering (~EUR 52,000): payback is reached in about 11 months, hosting included.
FAQ
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How much does custom site management software really cost in 2026?
Budget EUR 50,000 to 140,000 ex. VAT by scope. A core with field app and accounting integration usually lands between EUR 80,000 and 110,000.
Is SaaS really more expensive long-term?
Beyond 25-30 active users, yes. At 40 workers and EUR 45/month you exceed EUR 21,600/year in recurring licences, versus ~EUR 5,000/year hosting for owned software.
How long to go live?
Between 4 and 7 months for custom, versus 2 to 6 weeks for standard SaaS. The field module and payroll integration drive most of the timeline.
Does the mobile app work without network on site?
Yes, with an offline mode (+EUR 5,000-14,000) that syncs time entries and photos on reconnection, essential in dead zones.
What ROI can I expect?
The credible 2026 target is -20% overruns and +2 points of site margin, with payback often in 10 to 14 months for an SME of 30 to 50 workers.
Let's scope your project. Tell us your worker count, concurrent sites and current accounting tools: we frame a scope between EUR 50,000 and 140,000 by field priority. 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.
