In terms of raw materials:
Average Cost of Steel = $700-$800 per metric ton
Average Cost of Concrete = $100-$200 per metric ton (but this doesn't include extra expenses like aggregate, rebar, molds, etc.)
Average Cost of Lumber = $400-$600 per metric ton
Then you have to consider things like labor, time, etc. Steelworkers generally earn more than rough carpenters/framers. Steel goes up quicker, but then you still have to use lumber/aluminum to frame things out, and tying into steel takes a little extra time. Concrete takes a lot longer, because you have to build the molds, set rebar and supports, pour and then allow for time to dry. Building with block requires a similar time frame as concrete, and qualified masons generally earn more than rough carpenters/framers.
Overall, all lumber or mostly lumber construction is quicker and less expensive. The drawback is the allowable height you can build, which is upwards of four stories. Bay House is four stories of lumber on top of one story of concrete and steel.
All or mostly lumber construction is more costly to insure once built, but if you're building to sell, you generally don't care how much building operator or the condo owners have to pay in insurance.
