The verdict in three sentences
A structured quote paired with material and labor tracking stops the overruns that kill construction margins. In Lagos they drop from 15-20% to 6% and milestone mobile money payments protect cash flow. A bill of quantities and progress billing sharply reduce disputes.
Where cost overruns come from
Overruns start with a vague quote, outdated material prices, and unlogged labor hours. A dedicated app locks a bill of quantities, tracks real prices, and flags variances early, before the job is already lost.
| Item | Without tool (2026) | With site app (2026) |
|---|---|---|
| Average cost overrun | 15-20% | 6% |
| Quote / BOQ | Rough estimate | Detailed BOQ per line |
| Material prices | Frozen at start | Tracked, rise alert |
| Labor hours | Untracked | Daily logs |
| Billing | Lump sum at end | Progress milestones |
| Client disputes | Frequent | -50% via photo proof |
The payment milestones that protect cash flow
Billing by progress avoids fronting cash for months. A deposit at start, drawdowns at each validated stage, and a balance on handover align receipts with actual spend.
| Milestone | Share of amount | Trigger | Payment |
|---|---|---|---|
| Start deposit | 30% | Quote signed | Mobile money / transfer |
| Foundations done | 20% | Photo + validation | Paystack / MoMo |
| Structure | 25% | Progress report | Mobile money |
| Finishing | 15% | Quality checklist | Mobile money |
| Handover | 10% | Signed acceptance | Final balance |
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Mini case study
Tunde, a Lagos contractor, runs a job quoted at 20,000,000 FCFA equivalent with a 15% target margin (3,000,000 FCFA). Without tracking, an 18% overrun (3,600,000 FCFA) turns the job into a 600,000 FCFA loss. With the app, steel-price alerts and labor logs bring the overrun to 6% (1,200,000 FCFA): the protected margin stays at 1,800,000 FCFA. Milestone mobile money payments also avoid fronting 5,000,000 FCFA of cash.
FAQ
What is a BOQ and why is it central? The bill of quantities lists every line, quantity, and unit price. It turns a vague quote into a tracking baseline: in Lagos it is the first defense against 15-20% overruns.
How does the app track material prices? You enter reference prices at the start and the app flags any variance on real purchases. A rise in steel or cement triggers an alert before it wipes out the margin.
Are milestone payments suited to mobile money? Yes: each validated drawdown (photo, report) triggers a MoMo or Paystack payment. This avoids fronting cash for the whole build duration.
How much does such a tool cost in 2026? A quote-and-tracking app starts around 2,000,000 FCFA in a growth version. On a single job where it avoids a 600,000 FCFA loss, the payback is reached very quickly.
Let's talk about your project. We build your construction quote and site-tracking app with mobile money milestones and overrun alerts. 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.
