QTO · BOQ

BOQ generated from the BIM model, locked to drawing version — provably consistent with the design it derives from.

What it is

Quantity take-off and BOQ generation are the gateway from design to procurement. Quantities are extracted from the BIM model where available; coefficients are applied where not. Rate library lookup from Bandhoo populates pricing. The BOQ version is locked to the drawing version that generated it — when the design changes, the BOQ knows. Reconciliation between BIM and BOQ is continuous.

Inputs

Triggers

·Drawing revision published in M07
·Calculation sign-off received from M08
·Spec package released from M09
·Design change request approved in M12
·Tender pack assembly initiated in M14

Data reads

·BIM model from M07 (versioned)
·Calculation sizing summary from M08
·Spec package from M09 with policy citations
·Rate library from Bandhoo
·Coefficient library for non-modelled items

Artefacts consumed

·BIM model snapshot tied to drawing version
·Calculation results — loads, sizes, capacities
·Approved spec selections
·Bandhoo current rate data per item

Tools & Techniques

Methods

·BIM-based quantity take-off where the model has the geometry
·Coefficient application for items not modelled (formwork, scaffolding, finishes ratios)
·Rate library lookup from Bandhoo with date-locked rates
·14-column BOQ structure — item, spec, qty, unit, rate, amount, GST, totals, etc.
·Version-locked BOQ tied to drawing version — when drawing changes, BOQ knows
·Auto-recalc on design change request

Policies

·BOQ structure policy (14-column format)
·Rate library version policy
·BIM-to-BOQ extraction policy with audit trail
·Coefficient policy for non-modelled items

Decision rules

·BOQ version locks to drawing version — supersession is automatic
·Rate lookup uses date-locked rates; live rates only for current tenders
·Quantity divergence above threshold flags for DCO review
·BOQ sign-off requires DCO Head review

Outputs

Artefacts produced

·BIM-derived quantity register
·BOQ final, version-locked to drawing
·Rate library snapshot at BOQ time
·Reconciliation report — BIM quantities vs coefficient quantities

Data writes

·BOQ stored against drawing version with full lineage
·Quantity register fed to budget tracking in M11

Downstream triggers

·Final BOQ triggers tendering package assembly in M14
·BOQ recompute on design change feeds amendment workflow in M15
·Variance against DD budget surfaces in M11

Stakeholders

DCOOwns QTO and BOQ generation
CPTRate library, BOQ review, downstream tendering
DesignDrawing and BIM model as source
DCO HeadFinal BOQ approval

The flow

01BIM-based QTO — quantities from model
02Coefficient application for items not modelled
03Rate library lookup from Bandhoo
04BOQ draft — civil, MEP, finishing, façade
05BOQ review for completeness, rate accuracy, spec alignment
06BOQ final, version-locked to drawing version
07BOQ issuance to CPT for tendering

State change

Before

BOQ takes weeks; design changes during tender invalidate quantities silently.

After

BOQ is generated, versioned, and reconciles to drawings continuously.

Real-world example

Worli BOQ v4 generated from drawing set v8 on 14 May. 14-column format. 74 electrical items, 67 PHE, 54 FF, 54 HVAC, 15 CA. Rate library populates 89% of items; remaining 11% flagged for CPT input. Total estimated value ₹147.8 Cr.

Artefacts

·BIM-derived quantity register
·BOQ draft (multiple versions)
·BOQ final (version-locked)
·Rate library snapshot at time of BOQ

Pain today

BOQ preparation takes 2-3 weeks. Design changes mid-tender silently invalidate quantities. Reconciliation between BIM and BOQ is manual and partial.

Integrations

Bandhoo (rate library)ACC (BIM source)