Why has it become essential now to use construction equipment to economize the cost of construction?

The following reasons may be cited: The lobor productivity is always lower than the machine (equipment) productivity.
Labor productivity is not constant and depends on weather conditions so it is unreliable when you are behind the schedule and want to speed up.
The labor cost is ever increasing due to inflationary pressures while the equipment cost does not escalate to that extent.
Multi shift system can be adopted without too much expense.
The use of equipment reduces the overall project duration hence impacting the cost.

It is not necessary to use construction equipment for small jobs.
On most of jobs, however a combination of manual labour and machines appears most justified.But in developed countries where labour wages is very heigh and for large scale project use of construction equipments reduce significantly construction cost and time also.
Advantage of uses of Construction equipment: Tough work which is beyond the scope of manual labour can be performed efficiently and speedily.
At the time when human labour is uncertain, machines are the only alternatives, further these equipments are not affected by social and economic conditions of the region.
Due to use of machine, proper planning of work can be made which consequently reduces the overall cost of project.
For huge work or when large quantities of materials to be transported from one place to other, use of equipment are always cheaper.
 

Not only to cut down the cost, but also to complete it within time frame.
A construction equipment makes a task easier.
And also the productivity given by the labour work force is always less than the equipment.

At the present time, using construction equipments plays pivotal role in economizing the cost of  construction projects process. However, this is not the sole way to do. In my point of view, the most important thing deserving to consider is managing of the process. in the other words, team managment, time managment, cost managment are the stones of this sweet apricot process. Intrestingly, using modern construction equipment is a big help for all of these3 parts, providing than that of managment is never forgetten.

Nowadays labour availability has decreased and thus usage of machinery is important.Moreover handover of properties should be done quickly.Machinery provides a faster progress of work.