TIMING AN EXTENSION
From first thought to finish, the average single-storey extension takes about 10 months, though some people clearly mull things over for much longer. The Chart gives the average times when things could happen.
The organising stage will take around 12 weeks whether you go it alone or call in professionals. Thereafter a builder would be faster through the building stages with a single- storey building complete in 10 to 15weeks on average compared to the average of 26 weeks for the d-i-y project outlined below. A d-i-y project involving some hired help seems to take longer than an all d-i-y job – clearly there is some waiting time.