Your ARCON-registered architect is already legally required to supervise your site — and if they are not doing it, the answer is not to hire someone from a WhatsApp group.
This is the conversation happening in every Jericho and Bodija plot meeting that nobody wants to put in writing. Diaspora Nigerians building across Ibadan and Lagos are, right now in June 2026, sending between ₦150,000 and ₦500,000 every single month to individuals whose primary qualification is consistent posting frequency on Instagram. The belief is logical on the surface: you are in Manchester or Maryland, your architect visits once a month, and your reinforced columns are being poured on a Tuesday afternoon you will only see in a blurry video. So you hire a 'supervisor.' It feels responsible. It is, in practice, one of the most reliable ways to spend an extra ₦3–₦5 million on a project that should have stayed within budget.
What ARCON Actually Says About Your Architect's Responsibilities
The Architects Registration Council of Nigeria does not register architects and then excuse them from construction. ARCON's framework for professional practice places the registered architect of record squarely inside the construction phase — not merely at the design desk. When a registered architect signs and stamps drawings for your four-bedroom duplex in Bodija, they are not handing over a document and stepping aside. They are, legally, the professional who remains accountable for whether what is built reflects what was drawn.
That accountability has teeth. An ARCON-registered architect can face professional sanctions, have their licence reviewed, and carry civil liability when a building deviates materially from approved drawings. Your Instagram supervisor — regardless of how many project photos populate their feed — answers to no professional body whatsoever. They cannot be sanctioned. They cannot be struck off any register. When the lintel is under-specified or the DPC is missing from the blockwork, they send you a voice note and move on.
The Accountability Gap Nobody Talks About
The deeper problem with the dual-oversight arrangement is not just that your supervisor is unregistered. It is that introducing them creates a diffusion of responsibility that actively protects negligence. Your architect can point to the supervisor's presence and suggest the deviation happened 'on-site' outside their visibility. Your supervisor can point to the architect's drawings and claim they were only 'watching, not directing.' Both parties walk away. You carry a cracked beam.
The Real Cost of Duplicated Oversight in Naira Terms
Let us put actual numbers to this. A 4-bedroom bungalow in Ibadan — say, along the Ibadan-Lagos Expressway corridor where new-money estates are expanding rapidly — costs approximately ₦55–₦75 million to complete to a decent finish standard in mid-2026, given elevated cement, iron rod, and labour costs. Within that budget, a properly scoped architectural design and construction management engagement with a firm like Imprexi Integrated Concepts typically includes scheduled site inspections, materials-conformance checks, and written progress reports at defined milestones.
Now add an unsanctioned supervisor at ₦300,000 per month across an 18-month build. That is ₦5.4 million spent on a parallel layer of oversight with zero professional enforceability. And this figure does not account for the cost of errors those supervisors either failed to catch or — in documented cases — actively concealed to protect their ongoing engagement. Budget overruns driven by rework, compromised structural elements, and delayed material procurement authorisation are a known consequence of this arrangement across Oyo and Lagos States.
What Elevated Material Costs Mean for Supervision Quality
With the naira remaining volatile and imported materials priced in dollars, the stakes of poor construction supervision Nigeria-wide have never been higher. A single batch of substandard reinforcement rods that a qualified eye would have flagged on delivery can cost ₦800,000 to rectify once the concrete has cured. An ARCON architect conducting formal site inspections as part of their contracted scope will document material deliveries, compare specifications against approved schedules, and issue site instructions in writing. That paper trail is enforceable. A WhatsApp video of a man in a hard hat is not.
What to Do Instead — and What to Ask Before You Sign Anything
If you are a diaspora client building in Ibadan — whether in the established GRA, the maturing estates of Jericho, or the newer corridors off the Lagos Expressway — the first question you should ask any architect is not 'what is your design fee?' It is 'what does your site supervision scope include, how often will you visit, and what documentation will I receive after each inspection?'
If the architect cannot answer that question specifically, you do not need a supervisor to fill the gap. You need a different architect.
Imprexi Integrated Concepts' construction management service is built precisely around this problem. Clients — particularly those building remotely — receive structured inspection schedules, photographic site reports, and written site instructions that form a documented chain of professional accountability from groundbreaking to handover. This is not an add-on. It is the baseline of what professional construction oversight should look like.
For the Diaspora Builder Specifically
Being abroad does not mean being absent from accountability structures. The most protected position you can be in as a client building in Nigeria is one where a single, ARCON-registered firm holds full scope — design, supervision, and construction management — and where every site decision flows through a professional who can be held to account. Splitting that scope between a registered architect and an unregistered site supervisor Ibadan landlords are increasingly sourcing from referral chains does not make your project safer. It makes everyone involved less answerable.
The ₦5 million you think you are spending on extra oversight is often the exact amount the oversight failure will eventually cost you in rework, delays, and compromised structural integrity.
If you are planning a build or have a stalled project where the supervision arrangement has already broken down, contact Imprexi Integrated Concepts at https://imprexi.com/contact for a free consultation.