The verdict in three sentences
Running 12 sites at once on Excel means discovering overruns at the monthly progress valuation, when it is already late to react. Custom site management software costs EUR 30,000 to 60,000 for a European contractor in 2026 and ships in 4 months, against EUR 50 to 90 per user per month for a generic SaaS. The real gain: cost drift detected about 3 weeks earlier, on margins that rarely exceed 5 to 8 %.
The hidden cost of Excel across 12 sites
The construction manager receives reports by email, photos by messaging app, paper delivery notes and progress declared by subcontractors. Consolidation happens on Friday evening, when it happens at all.
| Problem | Observed frequency | Estimated annual impact (12 sites) |
|---|---|---|
| Cost drift detected at month end | 3 to 4 sites per year | EUR 40,000 - 90,000 margin lost |
| Snags not cleared at handover | 15 to 25 per site | 5 % retention held |
| Progress valuations prepared by hand | 12 per month | 2 site manager days per month |
| Unbilled variations | 1 to 3 % of contract value | EUR 30,000 - 70,000 |
| Subcontractor disputes without dated photo evidence | 2 to 5 per year | Penalties not applied |
| Construction manager reporting time | 6 h per week | 264 h per year |
On EUR 18 million of revenue, every margin point is worth EUR 180,000. Detecting drift three weeks earlier makes it possible to renegotiate, reassign crews or issue a change order before the cost is committed.
Custom or off-the-shelf SaaS
| Criterion | Site management SaaS | Custom application |
|---|---|---|
| Upfront cost | EUR 0 - 5,000 setup | EUR 30,000 - 60,000 |
| Recurring cost (40 users) | EUR 50 - 90 per user per month, or EUR 24,000 - 43,200 per year | EUR 250 - 500 per month hosting + 15 % maintenance |
| 3-year cost | EUR 72,000 - 130,000 | EUR 50,000 - 95,000 |
| Progress valuations in your own format | Imposed template | Your format |
| Link to accounting and estimating | Limited connectors | Custom |
| Offline mode on site | Variable | Built in from scoping |
For a team under 15 users, SaaS is often more cost-effective. Beyond 30 users, or with a very specific valuation process, custom pays back in two to three years.
Modules and budget
| Module | Function | Indicative 2026 budget (EUR) |
|---|---|---|
| Photo site reports | Geotagged, timestamped photos, offline | 4,000 - 8,000 |
| Progress and schedule | Progress per trade package, schedule comparison | 5,000 - 10,000 |
| Progress valuations | Automatic calculation, PDF export, engineer sign-off | 6,000 - 12,000 |
| Snag management | Pinned on drawings, assignment, closure with proof | 5,000 - 9,000 |
| Budget and drift | Committed, spent, cost to complete, alerts | 6,000 - 13,000 |
| Subcontractors | Documents, certificates, penalties | 4,000 - 8,000 |
| Total | Depending on integrations | 30,000 - 60,000 |
Mini case study
Thomas, construction manager at a 120-employee general contractor in Marseille, oversees 12 sites and EUR 18 million of revenue. He commissions an application for EUR 46,000, delivered in 4 months. In year one, two overruns are caught three weeks earlier, saving about EUR 55,000 of margin. Variations now documented with photos add 1 % of extra billing on EUR 4 million of relevant contracts, or EUR 40,000. Total: EUR 95,000 of gains for EUR 46,000 invested, before counting the 264 hours of reporting freed.
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FAQ
Does the application work without coverage on site?
Yes, offline mode is built in from scoping: photos, snags and progress are stored on the phone and synced when the network returns. This module represents about 10 % of the budget.
How long until we are operational?
Allow 4 months: 3 weeks of scoping, 11 weeks of development and 2 weeks of testing on a pilot site. Photo reports can be used from month two.
Can it connect to our estimating and accounting software?
Yes, through an API or structured export. This integration typically costs EUR 4,000 to 10,000 depending on the software in use.
Do subcontractors need an account?
It is recommended but optional. Limited access lets them report progress and close their snags with photo evidence, which reduces disputes.
What is the annual budget after delivery?
Allow 15 % of the initial cost for maintenance and enhancements, about EUR 7,000 for a EUR 46,000 project, plus hosting.
Let's scope your project. We map your sites, valuations and subcontractors, then price an application at EUR 30,000 to 60,000 delivered in 4 months. 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.
