ESTIMATION

Bill of Quantities (BOQ)

Itemised list of work activities with quantities and unit rates — forms the priced contract document.

Also calledboqbill of quantitiestender boq
Definition

Bill of Quantities (BOQ) is the itemised list of work activities with quantities and unit rates that forms the priced contract document for a construction project. Used as the basis for tendering, contract pricing, payment of running bills, and final settlement. The Indian standard reference: CPWD Manual + state Public Works Department (PWD) procedures; for private commercial work: project-specific BOQ format prepared by the structural engineer and quantity surveyor (QS).

A BOQ typically has 10-30+ items depending on project complexity: (1) Site preparation — clearing, demolition, dewatering. (2) Excavation — by depth and soil type. (3) Foundation — PCC, RCC footings, raft, piles. (4) Sub-structure — basement walls, plinth beams. (5) Super-structure — columns, beams, slabs by storey. (6) Roof — slab, waterproofing, parapet. (7) Masonry — brick walls, AAC blocks, partitions. (8) Plaster and painting. (9) Doors and windows. (10) Flooring — tiles, marble, vitrified. (11) MEP — electrical, plumbing, fire-fighting, HVAC. (12) Site work — paving, drainage, landscaping. Each item has unit (m³, m², kg, no.), quantity, rate (₹/unit), and amount.

Quantity calculation: from drawings, by formula or measurement. Quantities are computed during the tender stage by the structural engineer / QS, then refined at construction stage based on as-built conditions. The most-common Indian BOQ disputes: (1) quantity variation — actual installed quantity differs from BOQ, requiring contractor / client discussion on rate; (2) item description — vague items lead to scope dispute; (3) missing items — items not in BOQ but necessary for project completion. The BOQ is a contract document, not a mere estimate — every line item is legally binding once the contract is signed. Common BOQ formats: (a) FIDIC-style (with measurement, billing, and final account columns); (b) CPWD-style (item description + quantity + unit + rate + amount); (c) commercial-project bespoke format with line-item codes for ERP integration.

Where used
  • Project tendering — contractor pricing input
  • Contract document — basis for billing and payment
  • Running bill payment — actual installed quantities × BOQ rates
  • Final settlement — reconciliation of actual vs BOQ quantities
  • Quantity surveying — basis for cost monitoring and forecasting
Acceptance / threshold
Per CPWD / PWD / project specification: BOQ items defined unambiguously with units, quantities, descriptions; rates from validated source (DSR, state SOR, or competitive market); reconciliation of actual installed quantities at running bill and final settlement.
Site example
Site reality: a Pune commercial project's BOQ had 'concrete (M25)' as a single item without specifying placement category. The contractor priced based on average residential placement (₹4500/m³); actual project required pumped concrete to 60 m height (₹5800/m³). Cost overrun ₹14 lakh discovered at running bill stage. Always specify placement method and any special requirements in the BOQ description; otherwise contractors price based on least-restrictive interpretation.
Frequently asked
What is BOQ in construction?
Bill of Quantities (BOQ) is an itemised list of work activities with quantities and unit rates forming the priced contract document. Contains: item description + unit (m³, m², kg, no.) + quantity + rate + amount. Used for tendering (contractor priced bid), running bill payment, and final settlement. The Indian standard reference is CPWD Manual + state PWD procedures.
How is BOQ prepared?
(1) Drawings reviewed and quantities calculated by structural engineer / QS. (2) Item descriptions written unambiguously specifying material, dimensions, location, and method. (3) Rates obtained from validated source (DSR, state SOR, or competitive market). (4) BOQ formatted in standard template (CPWD, FIDIC, or bespoke). (5) Items reviewed for completeness; missing items can lead to disputes. (6) Final BOQ approved by client before tendering.
What is the difference between BOQ and estimate?
Estimate is a forward-looking projection of project cost — typically prepared at design stage with approximate quantities and rates. BOQ is a contract document — itemised list with quantities and rates that becomes legally binding once signed. Estimates have ±10-20% accuracy; BOQs are exact for the specified scope. Disputes arise when actual installation differs from BOQ — addressed through running bill reconciliation.
Related estimation terms
Construction Cost Estimation
Per sqft cost ₹1500-3500 in India
Quantity Estimation
Estimate cement, steel, sand, aggregate for given area
Material Wastage Factors
Cement 2-3%, steel 3-5%, tiles 5-10% typical
Rate Analysis
Computation of unit rate from material + labour + plant + overhead + profit. Reference: DSR, state SOR, in-house DB.
Abstract Estimate
Cost estimate at concept stage based on plinth area or per-bed/per-room rates. ±20% accuracy.
Detailed Estimate
Quantity-based estimate from drawings. Each work item × unit rate × quantity = cost. ±5% accuracy.
Contingency
Provision for unforeseen costs. CPWD: 3%. Private: 5-10%. Higher for renovation than new build.