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Table of average construction durations
To produce the CD, BCIS analysed more than 1500 buildings completed between 1998 and 2002. The relationship between contract duration in weeks and the total construction cost was analysed for each variable for all projects. A summary of the results for all 1500 buildings is given in the table below. The data reveals some interesting results …
 Typical construction duration (weeks)
Expected construction costs*£250,000£1,000,000£2,500,000£5,000,000
Project sector     
Whether for public or private sector clients, housing projects tend to take longer than others of the same value. The BCIS puts this down to the phased delivery of homes and the high level of infrastructure work that accompanies housing schemes.
private housing33496068
private non-housing22334147
public housing34526372
public non-housing21415464
Smaller projects – up to £550,000 – let on a lump-sum basis, and design-and-build projects more than £1.3m, tend to be completed more quickly than other projects.
management contracting14354959
construction management28425159
design and build32435056
design manage and construct31445259
other procurement methods30394549
traditional lump sum26435563
Contractor selection    
There does not appear to be any relationship with the method of contractor selection and the speed of construction.
two stage395261
single stage27425159
Client type    
Private sector non-housing projects worth more than £750,000 tend to be completed faster than those for public sector client.
local government23435767
other public sector22415362
housing association36526371
private sector housing34516270
private sector (non-housing)22334147
Building function    
Industrial building projects, including factories, cold stores and warehouses, are the real thoroughbreds when it comes to the race to complete, no doubt because they are relatively simple. The figures confirm that housing schemes are the slowest. The BCIS says that the figures show that the more complex the design the longer it takes to build.
utilities and civil engineering facilities17314148
industrial facilities17283540
administrative and commercial facilities26394753
health and welfare19435971
recreational facilities17395364
religious facilities2738n/an/a
educational and scientific facilities22395059
residential facilities37516168
common facilities26374551
The regional analysis is likely to be influenced by the types of project carried out in each region with London perhaps having more complex offices and the Midlands perhaps having more industrial buildings.
East Anglia28415056
Northern Ireland17415668
Yorkshire and Humberside27364146
All data28425259
*adjusted to 2nd quarter 2003 and UK mean location