There have been many ice ages during the last 2.6 million years but when people talk about the Ice Age, they are often referring to the most recent glacial period, which peaked about 21,000 years ago and ended about 11,500 years ago.
It costs roughly â¦ $11-$13 for the materials and contractors average about $5-$8 per square foot for labor, not including steps. For example, my company charges approximately $18 per square foot to build a deck.
CONSTRUCTION ITEM DESCRIPTION. Construction estimating unit cost for 4x4 deck posts (up to 8 ft height). NOTE -- This cost only includes the supporting posts for a deck. To calculate the total cost of a deck, you'll also need to add deck floor joists, deck flooring, railings, and possibly other structural framing work.