Table 4 Subassembly cost ratios for the representative contemporary house
Subassembly | Description | Cost ratio | Adjusted cost ratio | |
|---|---|---|---|---|
Roof | Roof cladding | Mainly including corrugated metal roof sheets, metal top-hat battens and insulation | 4.1% | 5.4% |
Roof framing | Timber trusses, rafters, ceiling joists, fixings, etc. | 15.9% | 20.9% | |
Windward Windows | Â | Single glazed, aluminum sliding or awning windows | 0.8% | 1.0% |
Internal finishes, fittings | Wall | Mostly plasterboard, also include ceramic tiles and painting | 6.8% | 51.2% (building interior) |
Floor | Mixed use of timber, carpet and ceramic tiles | 3.5% | ||
Ceiling | Mostly plasterboard, also including painting | 4.7% | ||
Fittings and fixtures | Built-in wardrobes/cupboards, kitchen units, bathroom suites, shelving, internal doors, etc. | 10.0% | ||
Mechanical | Air conditioning, heaters, ventilation, etc. | 10.0% | ||
Electrical | Lighting, conduits, cables, etc. | 4.0% | ||
Other | Site preparation, foundation, wall framing, other fenestrations, plumbing, etc. | 37.0% | n/a | |