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| Model 1 cost comparison for packaged roof-mounted plant room | ||
| Packaged plant room versus conventional site construction/installation | ||
| Prefabricated (£) | Conventional (£) | |
| Enclosure (8·6 m x 11 m x 3·7 m) Includes separate chiller enclosure and lift motor room | 67 500 | 45 000 |
| Heating Plant 3 x 200 kW boilers; primary/secondary pumps; pressurisation unit etc | 41 500 | 41 500 |
| Heating system pipework; insulation and ancillaries | 48 000 | 57 700 |
| Chiller plant 1 x 562 kW chiller; primary/secondary pumps pressurisation unit; external condenser | 106 000 | 106 000 |
| Chilled water system pipework, insulation and ancillaries | 38 000 | 44 900 |
| Part of ahu; 10m3/s, thermal wheel, heating and cooling coils, extract fan only | 20 300 | 20 300 |
| Gas installation | 4500 | 5300 |
| Cranage | 18 500 | by main contractor |
| Total | £344 300 | £320 700 |
| Model 2 . Cost comparison for a ptre-assembled 560 kw boiler system | ||
| Conventional site installation versus preassembled boiler system mounted on skid | ||
| Preassembled (£) | Conventional (£) | |
| Delivery/offloading/positioning | 800 | 400 |
| Site labour | – | 3500 |
| Materials (pipework, wiring, controls, insulation) | Inc in equipment | 7500 |
| Plant and equipment | 29 900 | 20 100 |
| Supervision | 400 | 1600 |
| Plant hire | 200 | 800 |
| Testing and commissioning (boilers, pressurisation unit, water balancing and controls) | 1100 | 2300 |
| Total | £32 400 | £36 200 |
| Model 3. Cost comparison for multi-service prefabricated module for four-pipe fan coil system | ||
| Multi service versus conventional site installation | ||
| Prefabricated (£) | Conventional (£) | |
| Fabrication and delivery to site of Multi-service modules (comprising busbar bracketry, ductwork and pipework) | 37 700 | N/A |
| Heating and chilled water pipework | Inc above | 13 400 |
| Primary ductwork (manufactured and delivered to fabricator) | 29 100 | 29 100 |
| Busbar/basket tray (busbar brackets delivered to fabricator, busbar and basket tray delivered to site for installation onto modules) | 7300 | 7300 |
| On site labour | 12 500 | 52 200 |
| Access equipment | 1000 | 2300 |
| Total | £87 600 | £104 300 |
| Note: works are for shell and core, and category A fit-out; insulation to services not included in either option. | ||
| The following exclusions relate to the cost models: inflation beyond fourth quarter 2001; incoming statutory services; builder’s work in connection with services; main contractor’s overheads, profit and attendance; main contract preliminaries; professional and prescribed fees; contingencies and design reserve; tax allowances; vat. | ||
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