night vs day construction costs?

Usually, large concrete placements take place at night because the ambient air temperature is lower, and no sun, both of which help the concrete hydrate with minimal cracking.

This is how large slabs on grade are placed in hot environments like mine is Arizona. Also, concrete bridge decks are placed at night for the same reason.

Placing concrete at night does not eliminate the need for concrete curing methods, however.

As far as cost is concerned, the labor force gets the same wage. I have heard that some workers get a 10% bump in their hourly wage when working over the evening hours.

From an efficiency stand point, day is the best, evening is slightly worse and graveyards are poor. This is specially true if it goes on in an irregular manner.

Indoor versus outdoor can also add to the inefficiency due to problems with lighting.

As previously mentioned, there can also be a wage difference.

Finally if all materials are not on hand, it is hard to get extra supplies at night while you can during the day.

Night vs day construction costs?

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I'd use a 20% - 30% adder to pay for differential and account for lower productivity.

yes there is a lot of diff b/w day n night, a men who can awake early he or she can be work with concentration,if his or her mind is fully intersted ti doing her or his job,but in night rarely people do work because they tired in the day n feel lazyness.