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Engineering · sub-page 01 · the spine

The eight stations
from Cost Plan
to Retention.

The spine that runs every construction project. Cost Plan, Bill of Quantity, Bill of Materials, Project Budget, Work Projection, Work Order, RA Bill, Retention Release. Each station handles Builder mode and Contractor mode differently — same module, two business realities.

§ 01
The spine
Eight stations · two modes · one ledger

The shape of every project.

Every construction project — Builder or Contractor — moves through the same eight stations. The deep-dives below walk each station: what it does, what menu items live there, and how Builder mode differs from Contractor mode at that step.
▸ THE SPINE · COST PLAN → RETENTION RELEASE · TWO MODES PARALLEL click any station below to jump to its deep-dive · all 170+ Excel functions surfaced 1Cost Planthumb rulebudget head 2BOQactivity-wiseqty of work 3BOMco-efficientmaterial qty 4Budgetbudget headmilestones 5PlanWBS · MSPwork projection 6Work Ordertender · WOamendment 7RA Billwork done · DPRcertified · QC 8RetentionDLP over →auto-eligible ▸ BUILDER MODE · 8 STATIONS · OUTSOURCED · CONTRACTOR MODE · SAME 8 + 3 LMP RAILS EVERY STATION POSTS TO FINANCIALS · BG REGISTER · ESCALATION · PRICE VARIANCE
§ 02
Stations
Eight pillars · one per station

Every station,
every menu item.

Each pillar below is one of the eight stations on the spine. The illustration shows a real example. The Builder vs Contractor split tags call out where the two modes diverge. The feature list names the actual Excel menu items in scope.
Station · 01 · Cost Plan

Thumb rule first. Detail later.

Before BOQ, before drawings, you need an order-of-magnitude. ₹X per sqft, build-up area Y sqft, total ≈ XY. The Cost Plan station — Budget Head Group, Budget Head Category, Budget Head, Project Budget Template — gives you that first cut and parks it as the reference point everything else gets compared against.

Builder mode Land + soft cost + civil + finishing + critical material — owner-supplied items separated.
Contractor mode Per-activity cost — labour rate + material + equipment hire + overhead loaded in.
Budget Head Group · Category · Head3-tier hierarchy · template-reusable
Project Budget TemplateReuse cost plans across similar projects
Budget Tagging for EscalationMark heads that escalate · steel, fuel
Project Budget ComparisonAcross projects · across companies
COST PLAN · TOWER B · ₹ 92 CR 2.4M sqft built-up · ₹ 3,833 / sqft thumb BUDGET HEAD HIERARCHY · 3 TIERS Civil · super-structure RCC · masonry · slab · column · beam ₹ 38.4 Cr Finishing · interior flooring · paint · false ceiling · plumbing ₹ 22.8 Cr MEP · services electrical · HVAC · fire · lifts ₹ 18.6 Cr Critical material · escalation cement · steel · owner-supplied ₹ 9.8 Cr Site overhead + contingency staff · plant hire · 5% contingency ₹ 2.4 Cr Total Cost Plan ₹ 92.0 Cr VS PROJECT TEMPLATE · TOWER A · COMPLETED Tower A actual · 1.9M sqft ₹ 3,720 / sqft · 3% under thumb ₹ 70.7 Cr ▸ COST PLAN LOCKED · BOQ STATION NEXT PROJECT BUDGET TEMPLATE · COMPANY-WIDE COMPARISON
Station · 02 · Bill of Quantity (BOQ)

Activity-wise quantity of work.

BOQ converts the building into a list of activities, each with a quantity. Excavation 4,200 cum. Reinforcement 380 MT. Brickwork 1,840 cum. Plaster 12,400 sqm. Once the BOQ is locked, every other station — BOM, Budget, Plan, Work Order, RA Bill — references back to it. BOQ Comparison and BOQ Amendment Register track every change with version history.

Builder mode BOQ as a whole · contracted out · sometimes split into civil/MEP/finishing packages.
Contractor mode BOQ split by sub-project, milestone, activity group · so labour and equipment can be loaded.
Activity Group · ActivityMaster taxonomy · standard library
Sub Project · MilestonePhasing · floor-wise · package-wise
BOQ Register · ComparisonAcross projects · cross-version
BOQ Amendment RegisterEvery revision · audit-trailed
BOQ · TOWER B · 412 LINE ITEMS ACTIVITY GROUPS Earthwork 14 items · 4,200 cum Concrete 68 items · 6,800 cum Masonry 42 items · 1,840 cum Finishing 128 items · 12,400 sqm MEP + miscellaneous 160 items · electrical, HVAC, fire, lifts SAMPLE LINE ITEMS · M30 GRADE CONCRETE Slab · F5-F12 2,840 cum ₹ 6,180 Column · all flrs 1,920 cum ₹ 6,420 Beam · all flrs 1,640 cum ₹ 6,300 Foundation · raft +12% revised ▸ BOQ AMENDMENT REGISTER · 4 REVISIONS Rev 1 → 2 → 3 → 4 · audit-trailed · approver-signed BOQ COMPARISON · TOWER A vs TOWER B · OUTLIERS FLAGGED ▸ BOQ LOCKED · BOM STATION NEXT
Station · 03 · Bill of Materials (BOM)

Co-efficient turns work into materials.

BOQ tells you you'll do 6,800 cum of M30 concrete. BOM tells you that becomes 2,720 MT of cement, 6,460 MT of aggregate, 4,420 MT of sand, 0.34 MT of admixture per cum — and 380 MT of reinforcement steel for the slab. The Resource Requirement transaction explodes the BOQ into a material plan. Auto Indent and Auto Issue then push it into Materials.

Builder mode Only critical/owner-supplied items go to BOM — cement, steel. Rest is contractor's scope.
Contractor mode Full BOM — every consumable, every grade · drives indent + issue + utilization tracking.
Resource RequirementBOQ × co-efficient = material qty
Substitute ItemPer-item alternates · auto-flags · price comparison
Auto Indent · Auto IssueTriggers Materials · zero re-entry
Mat Req & Utilization RegisterAgainst Budget · BOQ · WO · activity
BOM · M30 SLAB · 2,840 CUM CO-EFFICIENT × QTY = MATERIAL REQUIREMENT Cement OPC 53 0.40 MT/cum × 2,840 cum 1,136 MT Aggregate 20mm 0.95 MT/cum × 2,840 cum 2,698 MT Sand · river 0.65 MT/cum × 2,840 cum 1,846 MT Admixture · super-plasticizer 0.34% × 2,840 cum 9.7 MT Reinforcement steel · TMT Fe-500 120 kg/cum × 2,840 cum · slab 341 MT SUBSTITUTE ITEM · ALTERNATES MAPPED Sand · river → M-sand alternate if river sand unavailable · auto-flag AUTO INDENT → MATERIALS MODULE Indent generated 5 line items · auto-pushed to Materials → P2P ▸ BOM LOCKED · MAT-REQ TRACKED VS UTILIZATION PROJECT BUDGET STATION NEXT
Station · 04 · Project Budget

Money plan · per head, per milestone.

BOQ × rate = activity cost. BOM × price = material cost. Add labour, equipment, overhead, escalation provision. The Project Budget is the final money plan — broken down by Budget Head, broken down by Milestone, broken down by month. Budget Validation Register watches every commitment against it. Budget Tagging for Escalation marks heads — steel, fuel — that auto-revise on index change.

Builder mode Contract value to contractor as one head + critical materials separately + soft cost.
Contractor mode L · M · E loaded per activity · every ₹ lands on a budget head · variance tight.
Project Budget · Month-WiseCash flow projection · rolling forecast
Project Budget AmendmentVersioned · approver-signed · audit-trail
Milestone Group · MilestonePhasing · floor-wise · package-wise
Budget Tagging for EscalationCement, steel, fuel · index-linked
PROJECT BUDGET · TOWER B · ₹ 92 CR · LOCKED MONTH-WISE BUDGET · CASH PROJECTION M1 PEAK M12 BUDGET HEAD SPLIT Civil · super-structure ₹ 38.4 Cr · 41.7% Finishing · interior ₹ 22.8 Cr · 24.8% MEP · services ₹ 18.6 Cr · 20.2% Critical material · escalation ₹ 9.8 Cr · 10.7% ESCALATION-TAGGED HEADS · INDEX-LINKED Cement +9% YoY · alert at +5% Steel · TMT Fe-500 +11% YoY · alert at +5% ▸ BUDGET VALIDATION REGISTER · ACTIVE every commitment validated · over-budget blocks PO PROJECT BUDGET COMPARISON COMPANY-WISE · CFO LIVE ▸ WORK PROJECTION STATION NEXT
Station · 05 · Plan · Work Projection

When the work happens.

Budget tells you the cost. Plan tells you the timing. WBS structures the work — by floor, by package, by activity. MSP Import brings in the planned schedule. Work Projection back-loads — month-wise, item-wise, activity-wise — so you know the labour you need next month, the cement you need next week, the equipment you need on Saturday.

Builder mode Plan at package level · contractor's own micro-plan inside.
Contractor mode Plan at activity level · drives daily labour deployment + equipment scheduling.
WBS · Work BreakdownHierarchical · floor → package → activity
MSP ImportMicrosoft Project · auto-sync
Work ProjectionMonth-wise · activity + item-wise resource plan
Task Calendar · GanttDaily view · dependency-aware
WBS · TOWER B · 4 LEVELS · 18 MO PROGRAM Tower B · 18 months · 32 floors L0 Foundation + basement · M1-M3 L1 Super-structure · M4-M11 L1 Slab · 5th to 12th floor · M5-M8 L2 Activity · 5F slab · 18 days L3 · ACTIVE Finishing · M12-M16 L1 MEP + lifts · M14-M18 L1 WORK PROJECTION · APRIL · ITEM-WISE M30 concrete · for slab + columns 680 cum Steel · TMT Fe-500 82 MT Labour · 124 day-allocations contractor ▸ MSP IMPORT · MICROSOFT PROJECT · AUTO-SYNC ▸ WORK ORDER STATION NEXT
Station · 06 · Work Order

RFQ → tender → work order · contracted out.

Vendor onboarded. RFQ generated against the BOQ. Quotations come in. Price comparison auto-tabulates. WO Generation locks the contractor and the rate. Terms (WO T&C) capture retention %, mobilization advance, defect liability period, payment terms. Once signed — the contractor gets a portal login to bid online next time, submit work-done online, request inspection online.

Builder mode WO is the main lever · contract value tightly tied · BG + retention guard the developer.
Contractor mode Sub-contract WOs · same rules · also receives WO from the customer side (Customer RA Bill).
Tender · RFQ GenerationPer BOQ · multi-vendor · sealed
Tender Quotation · Price ComparisonSide-by-side · L1 auto-flagged
WO Generation · AmendmentVersioned · WO Completion Date Update · Bulk WO Short Close
Terms Setup · Payment TermsRetention %, mobilization advance, DLP, escalation
WO · CIVIL FRAME · TOWER B · ₹ 38.4 CR TENDER · RFQ · 4 BIDDERS · L1 SELECTED Vendor A · 38 yrs civil ₹ 39.8 Cr L2 Vendor B · 24 yrs · L1 winner ₹ 38.4 Cr L1 ✓ Vendor C · 19 yrs ₹ 41.2 Cr L3 Vendor D · disqualified · BG expired DQ WO TERMS · LOCKED Mobilization adv 10% · BG-backed Performance BG 5% · 24 mo validity Retention 5% · per RA bill DLP 12 mo from handover Escalation clause · cement + steel index-linked · auto-revise on price variance ▸ WO ISSUED · CONTRACTOR PORTAL ACCESS GRANTED vendor logs in · sees order · can submit RFI + work-done AMENDMENT · COMPLETION UPDATE · BULK SHORT CLOSE ▸ RA BILL STATION NEXT
Station · 07 · RA Bill · Work Done · Certification

Work done → certified → paid.

Contractor reports work done on the portal. Quality Control checks the activity. DPR (Daily Progress Report) records ground truth. The billing engineer certifies the quantity. The Contractor RA Bill is generated — automatically, against the WO rate, with retention deducted, escalation applied, mobilization adjustment netted, GST/TDS computed, payment requisition raised. AP gets a posted bill, not a paper one.

Builder mode Contractor RA Bills only · billing engineer certifies · paid against running balance.
Contractor mode Both ways · Customer RA Bills (we raise) + Contractor RA Bills (sub raises) · separate registers.
Work Done · DPR · QCDaily entry · QC group-tagged · evidence-backed
Contractor RA BillAuto-prepared · approval-routed · ageing-tracked
Customer RA BillFor contractors · raised on client · TDS 26AS reconciled
Payment Requisition · Hold/ReleaseTo AP · QC-fail blocks · auto-clear on resolution
RA BILL #4 · CIVIL FRAME · ₹ 5.6 CR vendor B · WO · April 2026 · 5th of month 3-STEP CERTIFICATION DPR ✓ site supervisor QC ✓ cube test passed Bill engineer ✓ qty certified BILL COMPUTATION Work done value · this RA ₹ 6.20 Cr + Escalation · cement index +9% + ₹ 0.18 Cr − Mobilization advance recovery − ₹ 0.42 Cr − Retention · 5% − ₹ 0.31 Cr − TDS · 1% · Sec 194C − ₹ 0.06 Cr Net payable · this RA ₹ 5.59 Cr ▸ PAYMENT REQUISITION RAISED · TO AP posted to vendor ledger · GST input credit captured RA BILL APPROVAL TIME · 4.2 DAYS AVG ▸ RETENTION RELEASE STATION NEXT
Station · 08 · Retention Release · Closure

DLP over → retention pays itself.

The 5% you held back from every RA bill sits as an outstanding to the contractor. The Defect Liability Period (typically 12 months from project handover) is the wait. The day DLP ends — Material Advance Eligibility flips, Retention Release auto-triggers, payment requisition flows to AP. Bank Guarantees release back to the vendor. Project closes financially. Bank Guarantee Register, Retention Release Ageing, Hold/Release — the closure stack.

Builder mode Builder releases retention to contractors at DLP end · BG returns to vendor.
Contractor mode Both sides — chase customer-held retention · release to your own sub-contractors.
Retention Release · WO-WisePer work order · per vendor · auto-eligible
Retention Release AgeingBuckets · 0-30 · 30-60 · 60-90 · 90+
Bank Guarantee RegisterPerformance · mobilization · retention · expiry alerts
Material Advance Eligibility · Hold/Release · Debit NoteClosure-stack accuracy · audit-trailed
RETENTION RELEASE · TOWER A · DLP OVER RETENTION POOL ₹ 4.84 Cr held · across 12 WOs BG OUTSTANDING ₹ 6.2 Cr 9 active · 2 expiring RETENTION RELEASE AGEING 0-30 30-60 60-90 90+ DLP OVER · ELIGIBLE FOR RELEASE Vendor B · DLP ended 2 Apr ▸ auto-eligible · payment requisition raised ₹ 1.92 Cr Vendor F · DLP ends 28 Apr ▸ pending · 18 days to release ₹ 0.84 Cr Vendor K · DLP over 92 days ▸ overdue release · vendor follow-up active ₹ 0.46 Cr BG · EXPIRING THIS QUARTER Vendor B perf BG · expires 12 Jun ▸ release to vendor on DLP confirmation ₹ 1.92 Cr ▸ RETENTION RELEASE WO-WISE · AGEING TRACKED PROJECT FINANCIALLY CLOSED · POSTED TO FINANCIALS
§ 03
Related
Other Engineering surfaces

Where to go next.

Project Engineering is the spine. The other four sub-pages of Engineering deepen specific surfaces — LMP, drawings, the contractor portal with AI scan, and BIM Revit BOQ.
For thirty years our project review was a fight about which spreadsheet was right. Now BOQ, Work Order, RA Bill, retention — they're all the same row. The contractor knows we know. Our certification time fell from twelve days to four. Our retention release ageing went from three crore overdue to zero.
— Director · Indian developer · 38 active projects · Mumbai + Pune
Next step

Walk a project
end to end.

30 minutes. We'll walk one of your projects — or one of ours — through all 8 stations. Cost Plan to BOQ to BOM to Budget to Plan to Work Order to RA Bill to Retention Release. Pick Builder mode or Contractor mode.