---
title: Defensible-for-Variations Pricing Posture
type: concept-note
status: live
created: 2026-05-04
created_by: cowork-lfcs (Phase 7)
applies_to_job_types:
  - all
related_concepts:
  - "[[TfNSW-R0220-pit-pattern]]"
  - "[[TfNSW-bridge-FRP-subcontract-pattern]]"
  - "[[Common-pricing-misses]]"
canonical_examples:
  - "[[2602 - Dec Projects - Munmorah Bridge]]"
  - "[[2626 - Mack Civil - Stormwater Pit EXA01A-08]]"
---

# Defensible-for-Variations Pricing Posture

> **A pricing strategy: when to use Rate Card V1.7 hourly basis vs internal cost basis.** Read this BEFORE choosing your bid posture on jobs where scope creep is likely (TfNSW dayworks, IFI drawings, RFI-driven scope, head-contractor-managed supply chain).

## TL;DR — the choice

When Rocky asks "competitive vs defensible posture?", the answer depends on these questions:

| Question | If YES → defensible | If NO → competitive |
|---|---|---|
| Is the work governed by IFI drawings (not IFC)? | ✓ defensible | ✓ competitive OK |
| Is it TfNSW dayworks (vs lump-sum) governance? | ✓ defensible | ✓ competitive OK |
| Are head-contractor RFI / variation cycles likely? | ✓ defensible | — |
| Does the head contractor manage supply chain? | ✓ defensible (variation = $ in) | — |
| Is this a small one-shot scope (no future VOs)? | — | ✓ competitive OK |
| Is winning the bid the dominant priority? | — | ✓ competitive OK |
| Is the job a strategic "get a foot in the door" with this client? | — | ✓ competitive OK |

**Rule of thumb:** TfNSW work + IFI drawings + head-contractor managed = ALWAYS defensible-for-variations. Lump-sum private work + IFC drawings + scope locked = competitive-for-award is OK.

## What "defensible-for-variations" means

The submission rate uses the **Rate Card V1.7 client-facing hourly basis** with overhead + margin embedded:
- Tradesperson day shift: **$85.00/hr**
- Tradesperson night shift (Sun-Thu 19:00-05:00): **$140.00/hr**
- Supervisor loading: **+$10.00/hr** ($95 day, $150 night)
- Saturday 1st 2 hrs: $105/hr; after: $120/hr
- Sunday: $140/hr (treated as night)
- Materials: cost + 10% markup
- Ute & tools: $150/day per vehicle
- 8-hr minimum call-out per working day

**Key property:** the rate at which the bid is priced is the SAME rate at which future variations bill. There's no commercial gap to negotiate when scope grows. Rocky doesn't need to defend a different rate for "extra work" — it's the same rate the bid was awarded on.

**Trade-off:** the bid is higher (overhead + margin embedded in hourly), so it's less likely to win competitive lump-sum tenders against contractors using internal cost basis with leaner margin.

## What "competitive-for-award" means

The submission uses **internal cost basis** with leaner margin:
- Tradesperson: ~$58-72/hr base (varies by shift)
- 18% margin built in
- All-in unit rates per BoQ line item

**Key property:** lower bid number, higher chance of winning a lump-sum tender on price.

**Trade-off:** if scope grows post-award, variations bill at a DIFFERENT (internal cost) basis than what the bid was awarded on — head-contractor QS will challenge: "why are your variations more expensive than your tender?". Hard to defend on dayworks jobs.

## Worked example — 2626 Mack Civil rev3-5 history

Round 3 of the AB-Test-Tracker for 2626 (FRP-install-only refinement) showed both postures side-by-side:

| Posture | Total ex GST | Why this number |
|---|---|---|
| **Defensible (claude-code-coo rev4)** | **$46,044** | Rate Card V1.7 NIGHT rates ($140/hr trade, $150/hr supervisor) embed overhead + margin. Productivity assumptions ~30-40% heavier (cautious). 15% redundancy on subtotal. Future variations bill at the same $140/hr basis = clean defence. |
| **Competitive (Cowork Huss estimate)** | **$25-30K** | Internal cost basis ($72-58/hr base depending on shift) with 18% margin built in. Productivity tighter. Lower number = more likely to win the bid award. But if scope grows, variations would bill at a different rate than tender = QS challenge. |

For 2626 (TfNSW dayworks pit + RFI 36 acceptance pending + AfC drawings pending), **defensible was the right call**. Lots of variation risk = the higher submission rate has a clean defence path when extras land.

For a one-shot lump sum private commercial slab job with IFC drawings and locked scope, **competitive would be the right call** — you want to win, scope won't drift, variations are unlikely.

Final settled posture for 2626: rev5 at $43,143 ex GST (defensible posture but with FRP-install-only scope refinement Cowork drove).

## Worked example — 2602 Munmorah Bridge

claude-code-coo's Phase 0 grill answer F1 ("figure it yourself") + G1 commercial posture decision = defensible-for-variations chosen because:
- IFI drawings stamped "scaled CAD post-award" → IFC drift guaranteed
- AS5100 (2017) compliance + Northrop civil + structural design coordination gaps
- Multiple TENDER QUERY items pending Tuesday QS call (bearing supply/install split, thrie beam alternative, carriageway discrepancy)
- TCE / Dec Projects head-contracting structure → variation cycles likely

Result: $407,870 ex GST submission. Variations on this job will bill at $85/hr day / $140/hr night basis SAME as tender = clean QS defence position.

## How to write this into the bid submission

**Tender Summary Sheet 5 (Terms) — explicit clause:**

> "All rates and prices in this submission are based on LFCS Rate Card V1.7 (15-Apr-2026). Variations and cancellations shall be priced at the same Rate Card V1.7 rates and conditions as included in this submission, including hourly rates, supervisor loading, materials cost+10% markup, ute & tools $150/day, and 8-hr minimum call-out per working day. Rate validity: 30 days from submission date."

**Tender Summary Sheet 3 (Option B Schedule of Rates) — full Rate Card V1.7 tier table** so head-contractor QS can compute any variation independently from the same basis as tender.

This combination removes the "different rate for variations" dispute vector. Future VOs slot cleanly into the awarded rate structure.

## Common Misses log entries this concept addresses

From `pricing-checklist.md` Common Misses:
1. **Midnight crossing loading $9,080** (caught by Cowork Round 2 on 2626 rev2) — defensible posture catches this because Rate Card V1.7 explicit clause is part of submission rate basis. Competitive posture using internal cost basis can miss it.
2. **Variation rate basis mismatch** — competitive bids that don't include Rate Card hourly basis as Option B SoR sheet leave QS unable to validate variation pricing later.
3. **Adverse weather + standby cancellations** — Rate Card V1.7 Min Call-Out clause covers this. Defensible posture inherits it; competitive posture must explicitly state.

## When competitive-for-award IS the right call

Don't read this concept as "always go defensible". There are scenarios where competitive-for-award beats defensible:

- **Solutions Plus Hornsby Field of Play (Mar 2026)** ([[Hornsby - Field of Play]] reference Bid in Airtable, $324K ex GST) — Liam Fitzgerald drafted as competitive; LFCS won the work. This was lump-sum private commercial with IFC drawings + locked scope. Right call.
- **Strategic loss-leader bid** to break into a new client relationship — accept tighter margin to win.
- **Repeat client with established trust + locked variation rates from prior contracts** — competitive number wins the bid; trust handles variations.

## Quick decision tree

```
Is it TfNSW work?
├── YES → defensible (default)
│   └── Is scope LOCKED (IFC drawings, RFI accepted, supply boundary signed)?
│       ├── NO → defensible CONFIRMED
│       └── YES → defensible still OK (but consider competitive if margins tight)
└── NO → check next question
    │
    Is it lump-sum private commercial with IFC drawings?
    ├── YES → competitive OK
    └── NO → defensible (default if uncertain)
```

## Routing in pricing-checklist + skills

`pricing-checklist.md` Phase 6 commercial discipline references this concept. Future `lfcs-pricing-estimator` skill (v2 gated) should:
1. Read this concept note as part of boot
2. Ask the calling user: "Defensible or competitive posture?" (with reasoning prompts from this note)
3. Apply the right rate basis (Rate Card V1.7 vs internal cost) to the buildup
4. Include Sheet 5 Terms clause + Sheet 3 SoR table for defensible
5. Adjust margin / productivity / language accordingly