Defined Cost build-up: the HV switchgear change
The Defined Cost assessment: plant and materials, subcontracted civils, people, equipment, charges and the Fee, each line traced to a source quotation, subcontract price, timesheet or Contract Data rate.
- Project
- Crestfield Distribution Centre, Warrington
- Contract
- NEC4 ECC Option A · £3,814,200
- Reference
- CREST-VBU-CE009 · Rev 1
- Period
- Period 7 · May 2026
- Prepared by
- BuiltAI Intelligence Ltd
- Basis
- Schedule of Cost Components
Illustrative example: fictional project and parties.
How the change is assessed
Assessed as the change in Defined Cost using the Schedule of Cost Components per NEC4 ECC Option A, with the Fee applied at 11.5% (Contract Data Part 2). Each line is traced to a supplier quotation, subcontract price, timesheet or Contract Data rate. Deductions are taken for the 11kV work already priced in the Activity Schedule: this is the net additional cost caused by the compensation event, not the gross cost.
Component breakdown
| Cost component | Description | Source | Amount |
|---|---|---|---|
| 1 · Plant and materials | 33kV MCSET switchgear panel, supply only, delivered (£48,200), less the 11kV RM6 ring-main unit already priced in the Activity Schedule (−£29,800) | EV-009-04 | £18,400 |
| 2 · Subcontracted civils | Extended reinforced base 2.4m × 1.8m × 300mm (£5,400) and cable-trench diversion around the larger base - 3.6m of trench, duct, backfill and reinstatement (£2,800) | EV-009-05 | £8,200 |
| 3 · People | HV jointer for 33kV dry-type stress-cone terminations (3 days), electrician attendance (2 days) and site engineer supervision (3 days), less the 11kV termination labour that would have been incurred anyway (−£1,640) | Timesheets + SCC rates | £2,800 |
| 4 · Equipment | 33kV primary injection test set hire, 2 days including calibration (£1,800), and the DNO witness-test fee differential - £3,200 at 33kV against £600 at 11kV (£2,600) | Hire quote + DNO schedule | £4,400 |
| 5 · Charges | Site preliminaries extension of 1.5 weeks at £3,200/wk, driven by the 33kV DNO witness-testing lead time (4 weeks against 2) | EV-009-07 | £4,800 |
| Subtotal - Defined Cost | £38,600 | ||
| Fee at 11.5% (Contract Data Part 2) | £4,439 | ||
| Total change to the Prices | £43,039 | ||
Sourcing and audit
The quotation was submitted at £43,039 - Defined Cost £38,600 plus the Fee at 11.5% (£4,439) - and the build-up above supports the submitted figure. The indexed Schneider quotation SC-2026-1147 evidences the £18,400 plant differential.