The verdict in three sentences
When the senior contracts manager of a Dublin main contractor writes reports in the evening for 15 live sites, information arrives late and snags get lost between phone photos and spreadsheets. A custom construction site reporting app costs 30,000 to 70,000 EUR in Dublin in 2026, delivered in 3 to 4 months, versus 35 to 90 EUR per user per month for an off-the-shelf SaaS. Custom makes sense from 20 to 25 users, or when your site report, snag list and handover templates must match your processes, BCAR inspections and ERP.
What the app must do on site
On an apartment scheme in the Docklands or a refurbishment in Dublin 2, mobile coverage is often poor in basements and stair cores. Offline mode is therefore not optional: entries sync as soon as the signal returns.
The expected modules:
- Site visit report dictated or typed on site, with time-stamped photos and weather, generated as a branded PDF and sent to the relevant trades.
- Snags pinned on drawings: a pin on the floor plan PDF, photo, responsible trade, close-out deadline.
- Practical completion and handover certificates signed on tablet, with or without snags, plus tracking of the defects liability period, typically 12 months.
- Subcontractor follow-up: automatic reminders, snag close-out with photo evidence, history per trade.
- Management dashboard: open snags per site, close-out times, sites behind schedule, inspection records supporting the Assigned Certifier under BCAR.
Custom build or site reporting SaaS
| Criterion | Site reporting SaaS | Custom app |
|---|---|---|
| Upfront cost | 0 to 4,000 EUR deployment | 30,000 to 70,000 EUR |
| Recurring cost | 35 to 90 EUR per user per month | 350 to 900 EUR per month in total |
| Subcontractor accounts | Often charged or capped | Unlimited |
| Report and certificate templates | Standard templates | Your exact templates |
| Offline mode | Varies by vendor | Built in from day one |
| ERP or document system integration | Generic API | Connector to your tool |
| Time to go live | 1 to 3 weeks | 3 to 4 months |
With 30 internal users at 65 EUR per month, a SaaS costs about 23,400 EUR a year, or roughly 117,000 EUR over 5 years. An app at 50,000 EUR plus 600 EUR per month comes to 86,000 EUR over the same period.
Detailed app budget
| Work package | Estimated effort | Indicative budget |
|---|---|---|
| Discovery, site workshops, wireframes | 5 to 8 days | 3,500 to 7,000 EUR |
| Offline mobile app (iOS, Android, tablet) | 12 to 25 days | 9,000 to 21,000 EUR |
| Site reports and PDF generation | 5 to 10 days | 3,500 to 8,500 EUR |
| Snags on drawings and close-out tracking | 8 to 15 days | 6,000 to 13,000 EUR |
| Handover certificates with e-signature | 4 to 8 days | 3,000 to 7,000 EUR |
| Back office, dashboards, subcontractor access | 5 to 10 days | 4,000 to 9,000 EUR |
| Pilot site testing, training | 1 to 5 days | 1,000 to 4,500 EUR |
| Total | 40 to 81 days | 30,000 to 70,000 EUR |
These are 2026 order-of-magnitude figures for the Irish market, excluding VAT. A simple electronic signature is enough for a handover between businesses under eIDAS; allow 0.50 to 2 EUR per signature if you use a qualified signature provider. Photos add up fast: 15 sites often generate 50 to 100 GB a year, to factor into hosting.
Mini case study
Conor, senior contracts manager at a 120-employee main contractor in Dublin, oversees 6 site managers across 15 sites. Each spends 90 minutes every evening writing reports, about 1,980 hours a year for the team over 220 working days. The app brings this down to 20 minutes, freeing 1,540 hours, valued at 60 EUR of loaded hourly cost: roughly 92,400 EUR a year.
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On snags, if average close-out time drops from 45 to 25 days, the 5 % retention is released earlier and disputes at the end of the defects period decrease. For a 55,000 EUR project, payback comes in 7 to 9 months in this scenario, even counting only half the freed time.
FAQ
How much does a custom site reporting app cost?
Between 30,000 and 70,000 EUR in Dublin in 2026 depending on modules, offline mode and ERP integration. Maintenance and hosting run 350 to 900 EUR per month.
Is a handover certificate signed on a tablet valid?
Yes, an electronic signature is admissible between businesses under eIDAS if signer identity and document integrity are guaranteed. The time-stamped PDF and audit trail serve as evidence.
Does the app work without signal?
Yes, all entries and photos are stored on the device and then synced. A site with no signal for 3 days stays fully usable without data loss.
Do subcontractors need to install the app?
No, they can receive a web link to view and close their snags with a photo. This matters when 20 to 40 firms work on the same site.
What timeline should we plan?
Three to four months, including a 3 to 4 week pilot on a live site before rollout to all site managers.
Let's scope your project. Send us your report and handover templates, user count and ERP: we will price a site reporting app in work packages, with a pilot on one site and a 3 to 4 month plan. Detailed quote within 48 h via our form. 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.
