The Center Line Method is the fastest and most efficient way to calculate the construction estimate of any building. In this post, we will calculate the complete quantity of Earthwork, PCC, Brickwork, and DPC for 3 parallel rooms, using the center line data provided in the drawing.

This example is perfect for students, QS engineers, diploma students, and quantity surveying learners.

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1. Understanding the Room Layout

Based on the drawing:

• Three parallel rooms
• Each room size:
  Internal length = 5.0 m
  Internal width = 4.5 m
• Total building length = 15.90 m
• External width = 4.80 m

✔ Total Center Line Calculation

(From the diagram provided)

• Long walls center line = 15.90 × 2 = 31.90 m
• Short walls center line = 4.80 × 4 = 19.20 m

✔ Total Center Line = 31.90 + 19.20 = 51.10 m

(Your chart shows 51.1 m, which is perfect)

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2. Quantities as Per Center Line Method

Below is the complete quantity table calculated for earthwork, PCC, brickwork (steps), DPC, and brickwork above DPC.

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Table: Construction Quantities (Center Line Method)

S.No	Description	No	Length (m)	Breadth (m)	Height (m)	Quantity (cum)
1	Earth Work	1	51.1	1.05	1.20	64.38
2	P.C.C	1	51.1	1.05	0.20	10.73
3	Brick Work in Foundation
	Step No.1	1	51.1	0.75	0.30	11.49
	Step No.2	1	51.1	0.60	0.30	9.19
	Step No.3	1	51.1	0.45	0.30	6.89
4	D.P.C	1	51.1	0.30	0.0381	0.58
5	Brick Work Above DPC	1	51.1	0.30	3.50	53.65

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3. Brickwork Total Calculation

Total Brickwork = 11.49 + 9.19 + 6.89 + 53.65

✔ Total Brickwork = 81.22 cubic meters

Number of bricks per cubic meter:

• 1 cum = 500 bricks (standard in Pakistan)

Total Bricks = 81.22 × 500 = 40,610 bricks

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4. Cost Estimation (Update Rates as Needed)

Below is a typical cost calculation template.
You can insert your own updated rates (Jan 2025):

Item	Quantity	Rate	Amount (PKR)
Earthwork	64.38 cum	_____	_____
PCC (1:4:8)	10.73 cum	_____	_____
Brickwork	81.22 cum	_____	_____
DPC	0.58 cum	_____	_____
Cement	___ bags	___	___
Sand	___ cft	___	___
Crush	___ cft	___	___
Steel (if included)	___ kg	___	___

I can complete the cost section if you want specific market rates (KPK/Pakistan Nov–Dec 2025).

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5. Advantages of Center Line Method

✔ Fastest calculation method
✔ Reduces repetition in long buildings
✔ Best for residential & commercial buildings
✔ Suitable for foundations, walls, PCC, DPC, beams

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6. Conclusion

The Center Line Method is an accurate and time-efficient approach for calculating material quantities. For 3 parallel rooms, the total center line is 51.1 m, and the quantities for earthwork, PCC, brickwork, and DPC are calculated precisely as shown in the tables.

This method is widely used in Pakistan for house construction, especially in 5 marla and 10 marla buildings.

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7. FAQs

Q1: Why is Center Line Method used?

Because it avoids repetitive calculations and works best for symmetrical buildings.

Q2: How many bricks are needed for 3 rooms?

Approximately 40,610 bricks, depending on mortar thickness.

Q3: Is this method accurate for irregular buildings?

No, long wall–short wall method is preferred for irregular plans.

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8. Internal Linking Suggestions (for CivilConstructionGuide.com)

Add these links for SEO boost:

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