What is BOQ? | Q & A

BOQ (Bill of Quantities) is a detailed, item-wise document that lists all construction works, their measured quantities, units, and often rates, prepared from approved drawings and specifications.

It is mainly used for cost estimation, tendering, billing, and project control.

What Information Does a BOQ Contain?

A typical BOQ includes:

• Item description (e.g., RCC M25 in slab)

• Unit of measurement (m³, m², kg, nos)

• Quantity

• Rate (in tenders)

• Amount

Example BOQ Item

RCC work in M25 grade in slabs, including centering, shuttering, and vibration
Unit: m³ | Quantity: 120.00

Why BOQ Is Important?

• Basis for tender comparison

• Helps in material planning

• Used for running bills (RA bills)

• Controls project cost

• Reduces disputes between client and contractor

Who Prepares BOQ?

• Quantity Surveyor

• Planning / Billing Engineer

• Consultant (for tender BOQ)

BOQ vs Estimate (Interview Comparison) AspectBOQEstimate

Purpose	Contract & billing	Cost prediction
Detail	Item-wise	Approximate
Based on	Approved drawings	Preliminary drawings

Site Engineer’s Role with BOQ

• Verify quantities executed on site

• Record measurements in MB (Measurement Book)

• Coordinate with billing engineer

• Ensure work matches BOQ items

One-Line Interview Answer (Perfect)

BOQ is a detailed, item-wise statement of quantities prepared from drawings, used for tendering, billing, and cost control of a construction project.

Common Follow-Up Questions

Q: What happens if an item is missing in BOQ?
A: It is treated as an extra item and paid after approval.

Q: Is BOQ part of contract documents?
A: Yes, it forms a key part of the contract.