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🔍 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

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