The verdict in three sentences
A site manager documenting projects on a phone and re-keying at night loses 2 hours a day and courts handover disputes. A field mobile app (30,000 to 70,000 EUR, 12 to 18 weeks) captures timestamped photos, reports and snags, even with no signal. The structural choice is native or PWA, because it drives cost and the offline experience.
Native vs PWA: what really changes
Many sites sit in no-signal zones: offline mode isn't optional. The native-vs-PWA debate turns on real use of camera, GPS and local storage.
| Criterion | Native iOS/Android app | PWA |
|---|---|---|
| Initial build | 45,000 - 70,000 EUR | 30,000 - 45,000 EUR |
| Camera/GPS access | full, smooth | good, minor limits |
| Offline | robust (native storage) | solid (service worker) |
| Deployment | App/Play stores | URL, no review |
| Updates | via stores | instant |
| Maintenance/yr | 9,000 - 14,000 EUR | 6,000 - 9,000 EUR |
For an SME that wants to move fast and skip the stores, a PWA is often enough; native is justified for heavy high-resolution photo and intensive offline use.
The field ROI
The gain comes from eliminated reporting time and fewer handover disputes thanks to timestamped, geolocated evidence.
| Lever | Before | After field app | 2026 impact |
|---|---|---|---|
| Daily reporting | 2 h/day/manager | 20 min/day | ~1.7 h x 220 d x 45 EUR = 16,830 EUR/manager/yr |
| Handover disputes | frequent, costly | timestamped proof | -40% disputes |
| Snag clearance | paper tracking | traced tickets | delay -30% |
| Office re-keying | daily | eliminated | zero double entry |
Across 4 managers, reporting time recovered alone tops 67,000 EUR/year — the equivalent of the build in the first year.
Mini case study
Thomas, lead site manager at a fit-out SME in Toulouse (4 managers, 30 projects/yr). Each manager loses 2 h/day to reporting and re-keying. The firm invests 52,000 EUR in a field PWA with timestamped photos, snags and offline mode. Result: 1.7 h/day/manager recovered (about 67,000 EUR/yr across 4 managers) and handover disputes cut by 40%, avoiding several thousand euros of contested rework. Payback in under 10 months.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
FAQ
How much does a construction field app cost in 2026?
From 30,000 to 70,000 EUR: about 30,000-45,000 EUR for a PWA, 45,000-70,000 EUR for native iOS/Android. A first scope (photos, reports, snags) ships in 12 to 16 weeks.
Does offline mode really work on site?
Yes. Data entered is stored locally then synced when signal returns. Scope it early in the quote as it drives the architecture.
Do we have to go through the App Store and Play Store?
Only for native. A PWA installs from a URL with no store review and instant updates — ideal for fast field rollout.
Do the photos hold up in a dispute?
Timestamps and geolocation strengthen the evidentiary value of snag and handover photos, sharply reducing challenges.
Can the app connect to our site-management software?
Yes, via API. The field app feeds the central software (reports, snags), eliminating any office re-keying.
Let's scope your project. Tell us your manager count, network constraints and native/PWA choice and we'll price the build and rollout. 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.
