Worked pre-tender example
This example is based on a trade package let under a construction management contract.
Site location: Central London
Work location: Retained basement slab; working around existing structure
Package: Concrete work
Duration: 36 weeks
When estimating this type of work the preliminaries need specific attention. The pricing schedule broke down the preliminaries into headings. In order to price these, the headings need to be assessed for the works required.
| Preliminaries | |
| Site management and staff | £716,720.00 |
| Accommodation and furniture | £3,600.00 |
| Hoisting/lifting/craneage |
£96,000.00 |
| Temporary services |
£47,900.00 |
| Communications |
£20,060.00 |
| Safety |
£173,800.00 |
| Rubbish removal |
£34,200.00 |
| O&M manuals/record drawings |
£45,000.00 |
| Plant |
£123,840.00 |
| Scaffolding | £104,600.00 |
| Concrete test cubes | £12,000.00 |
| Overhead and profit (6%) | £82,663.20 |
| Total preliminaries |
£1,460,383.20 |
The associated measured works came to £5,804,186.49, which meant the preliminaries elements came to 25.16% of the measured works. It is only in understanding the nature of the works being carried out is it possible to develop up a version of the preliminaries rather than relying on a typical percentage addition. This is particularly prevalent in atypical projects.
In the context of this pre-tender estimate the measured works included the following concrete works:
- Crane bases (Level B3)
- Level B3 bases and pits
- Level B3 slabs
- Level B3 lining walls
- Level B3 columns
- Level B3 stairs (steps for change in levels)
- Level B3 service tunnel
- Level B2 slabs
- Level B2 upstands
- Level B1 slabs
- Level B1 upstands
- Ground floor slabs
- Ground floor upstands
- Core A (level B3 to roof)
- Core B (ground to level 4)
- Core C (level B2 to roof)
- Core capping slabs
- Below slab drainage
- Ancillary items - earthing pits, column strengthening, etc.
| Item |
Description | Qty |
Unit |
Rate |
Total |
| Preliminaries | |||||
| Site management and staff | |||||
| A | Project manager |
36 | wks | 2500 | 90,000.00 |
| B | Foreman | 36 | wks | 2500 | 72,000.00 |
| C | Senior engineer | 20 | wks | 1800 | 36,000.00 |
| D | Site engineers | 80 | wks | 1400 | 120,000.00 |
| E | Assistant site engineers | 80 | wks | 1000 | 80,000.00 |
| F | Logistics manager | 36 | wks | 1500 | 54,000.00 |
| G | QA engineer | 36 | wks | 1500 | 54,000.00 |
| H | IT/document controller | 36 | wks | 1200 | 43,200.00 |
| I | Construction support | 36 | wks | 900 | 32,400.00 |
| J | Reinforcement engineer | 20 | wks | 1500 | 30,000.00 |
| K | Planner (40%) | 14.4 | wks | 1800 | 25,920.00 |
| L | Senior surveyor (40%) | 14.4 | wks | 2000 | 28,800.00 |
| M | Assistant surveyor | 36 | wks | 1400 | 50,400.00 |
| Accommodation and furniture |
|||||
| A |
Stores (2Nr) | 72 |
wks | 50 |
3,600.00 |
| Hoisting/lifting/craneage | |||||
| A |
Erect hoists to cores |
2 |
nr |
12000 |
24,000.00 |
| B |
Driver and hire |
36 |
wks |
2000 |
72,000.00 |
| Temporary services |
|||||
| A | Electrical connection |
|
item | |
500.00 |
| B | Trailing leads |
|
item | |
2,000.00 |
| C |
Lighting tripods |
|
item | |
1,000.00 |
| D | Equipment | |
item | |
10,000.00 |
| E |
Slip cables and wiring |
|
item | |
15,000.00 |
| F |
Standby generators |
18 |
wks |
800 |
14,400.00 |
| G |
Temp plumbing hose |
|
item | |
5,000.00 |
| Communications | |||||
| A |
Calls | 36 |
wks |
100 |
3,600.00 |
| B | Fax | 36 | wks | 35 | 1,260.00 |
| C | Copier | 36 | wks | 25 | 900.00 |
| D |
Stationery |
36 | wks | 25 |
900.00 |
| E | Site two way radios (6Nr) |
216 | wks |
25 | 5,400.00 |
| F | IT equipment |
|
item | |
8,000.00 |
| Safety | |||||
| A | Supervisor | 36 | wks | 1300 | 46,800.00 |
| B | Equipment | 36 | wks | 750 | 27,000.00 |
| C | Protective screens |
|
item | |
50,000.00 |
| D | Safety netting |
|
item | |
50,000.00 |
| Rubbish removal | |||||
| A | Labour - cleaning |
36 | wks | |
27,000.00 |
| B | Skips | 36 | wks | |
7,200.00 |
| O and M manuals/record drawings | |||||
| A | Allowance | |
item | |
45,000.00 |
| Plant | |||||
| A | Concrete pumps |
72 |
wks | |
86,400.00 |
| B | Setting out equipment |
108 | wks | |
14,040.00 |
| C | Small tools |
36 | wks | |
14,040.00 |
| D | Consumables | 36 | wks | |
9,000.00 |
| Scaffolding | |||||
| A | General access |
|
item | |
10,000.00 |
| B | Scaffolders - labour |
36 | wks | |
39,600.00 |
| C | Haki stairs |
|
item | |
25,000.00 |
| D | Handrails and the like |
|
item | |
30,000.00 |
| Concrete test cubes | |||||
| A | Allowance | |
item | |
12,000.00 |
| Overhead and profit | |||||
| A | OHP on preliminaries |
6% | |
|
82,663.20 |