ABSTRACT
Model location is Outer London TPI = 466; LF = 1.00
This updated cost model is copyright of Davis Langdon LLP and was originally published in Building Magazine in Nov-09
Land Remediation Quantity Unit Cost (£) Total (£) Rate (£/m²)
General items 353900 17.70
Performance Bond and Insurances item 25000
Site mobilization item 8900
Site running costs 32 weeks 10000
Ground investigation 54900 2.75
Trial pits and boreholes item 4900
Laboratory analyses and sampling item 50000
Geotechnical and specialist services 304900 15.25
Bioremediation – mobilization item 10000
Bioremediation – treatment 8000 m3 20
Stabilization and solidification – mobilization item 4900
Stabilization and solidification – treatment 2000 m3 65
Demolition 10000 0.50
General site clearance 20000 m² 0.50
Earthworks 2309300 115.47
General excavations 50000 m3 1.5
Extra over for hand excavation 200 m3 50
Breaking out tarmacadam surfaces 300 m3 4.9
Breaking out mass concrete 1000 m3 7.4
Breaking out reinforced concrete 800 m3 12.40
On-site material management 51800 m3 4
Trimming and preparation of excavated surfaces 20000 m² 0.5
Screening of excavated material 50000 m3 1
Crushing and screening of hard material 1800 m3 7.4
Disposal of tarmacadam off site including haulage 300 m3 40
Disposal of non-hazardous material off site
Land Remediation Quantity Unit Cost (£) Total (£) Rate (£/m²)
Disposal of hazardous material off site including haulage 3000 m3 120
Disposal of WAC-failing hazardous material off site including haulage 1000 m3 150
Landfill Tax on disposed material, based on 1.9 tonnes/m3 19570 tonne 41
Filling of material arising from site screening and crushing 31800 m3 1.5
Filling of material arising from on-site treatment 10000 m3 1.5
Imported granular material to make up levels to existing 10300 m3 25
Miscellaneous works 10000 0.50
Repairs to boundary fencing, walls etc. item 10000
Contractor overheads and profits 438000 22.90
Allowance contractor's overheads and profit 4%
Design reserve 10%
Construction cost (rate based on gross site area) 3481000 174.07
haunch height. The costs are based on a generic solution with a gross internal floor area of 70000m², which includes 5% office and ancillary accommodation (3500m²). Costs of enhancements including the warehouse and office area fitout and ancillary buildings, together with costs of external works are detailed. Costs of racking and materials handling installations are not included. The model has been prepared on the assumption that ground conditions are good and that minimal site preparation is required.
