09/06/2025
🔍 What is Cost Overrun in Construction?
Cost overrun in construction refers to a situation where the actual cost of a construction project exceeds the original estimated or budgeted cost.
In simpler terms:
“You planned to spend ₦100 million on a project, but you ended up spending ₦120 million. That ₦20 million extra is the cost overrun.”
📌 Why Does Cost Overrun Matter?
Cost overruns erode profit margins, damage the reputation of contractors, delay project delivery, and in some cases, can cause complete project failure. For clients and contractors alike, it's a red flag that something went wrong in planning, ex*****on, or both.
🛠️ Common Causes of Cost Overruns
1. Poor Project Planning or Estimation
Underestimating material, labor, or equipment costs.
Missing contingencies for inflation, market volatility, or delays.
2. Design Changes / Scope Creep
Client keeps changing requirements during construction.
Architect or consultant revises drawings after work has started.
3. Delays in Project Schedule
Time is money. Delays lead to increased labor, equipment rental, and overhead.
4. Material Price Fluctuations
Global or local economic factors can cause spikes in the cost of steel, cement, fuel, etc.
5. Inaccurate Quantity Take-offs
Errors in Bill of Quantities (BOQ) lead to shortages or overorders.
6. Poor Site Management
Inefficiencies, wastage, theft, or rework due to lack of supervision.
7. Unexpected Ground Conditions
Discovering unstable soil or underground utilities during excavation.
📈 Real-World Example (Nigerian Context)
Suppose your company, Baroman Engineering and construction company limited signs a deal to build a luxury 4-bedroom duplex in Port Harcourt for ₦150 million.
You estimate:
Materials: ₦80 million
Labor: ₦40 million
Equipment & Logistics: ₦10 million
Overhead/Profit: ₦20 million
But midway through the project:
The client demands a bigger swimming pool.
The cost of cement rises.
You discover waterlogged soil that requires deeper foundation work.
Now the project costs rise to ₦185 million.
This ₦35 million extra is the cost overrun.
📊 How to Prevent Cost Overrun
1. ✅ Accurate Estimation (Use Quantity Surveyors wisely)
2. ✅ Build in Contingencies (10–15% in budget)
3. ✅ Use Contracts that Limit Scope Creep
4. ✅ Monitor in Real-Time (Project Management tools)
5. ✅ Train Your Team & Supervise Effectively
6. ✅ Conduct Proper Site Investigation
7. ✅ Maintain Clear Communication With Stakeholders.
Cost overrun is not just about money – it’s about management, foresight, and discipline.
A great construction expert always controls the triangle of cost, time, and quality to ensure the project is delivered within budget, on schedule, and up to standard.
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