The verdict in three sentences
A vertical construction ERP covers the basics if your processes fit its mould — but every deviation (specific drawdowns, a branded buyer portal, an in-house accounting connector) costs add-ons or re-keying. A custom platform between 55,000 and 110,000 EUR unifies schemes, site budgets, contract document management, and reservations in one flow. Across 150 units/year, avoiding 8-12% of budget overruns pays back the project in a single operation.
Vertical ERP vs custom platform: the comparison
A vertical ERP's per-user cost looks modest, but a development + technical + sales team quickly exceeds 20-30 licenses.
| Item | Vertical construction ERP | Custom platform |
|---|---|---|
| Setup | 5,000-20,000 EUR | 55,000-110,000 EUR |
| Subscription | 60-120 EUR/mo/user | Hosting 250-600 EUR/mo |
| 25 users / year | 18,000-36,000 EUR | 3,000-7,200 EUR (hosting) |
| Custom drawdowns | Paid add-on | Native |
| Buyer portal | Standard | 100% customized |
| Accounting / CRM connector | Vendor-dependent | Custom |
| Maintenance / year | Included | 15% of build |
| 3-year cumulative cost | 59,000-128,000 EUR | 80,000-140,000 EUR |
Custom costs more upfront but absorbs every developer specificity, where the vertical bills each deviation.
What the platform must actually steer
A developer doesn't steer 'a site' but a portfolio of schemes at different stages, with precise financial and legal flows.
| Module | Key function | Estimated gain |
|---|---|---|
| Site budget tracking | Budget vs committed vs billed | 8-12% overruns avoided |
| Drawdowns | Automated staged schedule | Cash flow secured |
| Contract document mgmt | Contracts, amendments, handover | Fewer disputes |
| Buyer portal | Unit tracking, choices, docs | Smoother client relation |
| Reservations | Sales pipeline, options | Conversion tracked |
| Accounting / CRM connector | Two-way sync | 6 hrs/week reporting |
Site budget tracking is the ROI core: catching a slip at 5% rather than 15% changes an operation's financial outcome.
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Mini case study
Mark, development director at a Dublin developer, steers 150 units/year across 6 operations. Before the platform, tracking runs on spreadsheets, with ~6 hrs/week of manual consolidation and average overruns of 4% of the works budget. After deploying a custom platform at 82,000 EUR (hosting 400 EUR/mo, maintenance 12,300 EUR/yr), overruns fall to 1.5%. On an annual works budget of ~22M EUR, saving 2.5 points preserves ~550,000 EUR/year in margin. Add 6 hrs/week of reporting reallocated (~15,000 EUR/yr). The project pays back on the first pilot operation.
FAQ
Isn't a vertical ERP enough? It is if your processes fit its standard. The moment you have specific drawdowns, a branded buyer portal, or an in-house accounting connector, each deviation becomes a costly add-on or re-keying.
How much does the buyer portal cost? Built into a custom platform, it's part of the build (55,000-110,000 EUR). As an add-on to a vertical ERP, budget 8,000-20,000 EUR plus an extra subscription.
What's the implementation timeline? Plan 12 to 20 weeks by module count: scoping 3 weeks, development 8-12 weeks, testing and data migration 2-5 weeks.
How is ROI calculated? Mainly on budget overruns avoided (8-12%) and reporting time saved (6 hrs/week). On a 150-unit portfolio, a single point of preserved margin often exceeds the project cost.
Can we connect our existing accounting? Yes. A two-way connector syncs entries, invoices, and drawdowns with your accounting software. Budget 6,000-14,000 EUR depending on the available API.
Let's scope your project. Describe your operations, unit volumes, and drawdown flows: we'll price a 55,000-110,000 EUR platform built for your steering. 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.
