If rainy weather prevents you from getting the job done on time,
virtually all construction contracts will allow you to claim an
extension of time (EOT). In fact, for reasons we will consider in
another blog, your head contractor or principal may benefit from
granting you an EOT so that it can claim liquidated damages if you
do not practically complete your works by the extended time for
completion.
However, contractors often want to take their delay-claim a step
further by also seeking to be compensated for the losses that they
suffer by having to "man-down" or keep their labour and
machinery idle on site while they wait for delayed head works to
catch up to them. This kind of loss is commonly known as
"prolongation costs".