Carpet/pad/install for me is about $3.50/ft with rem pack carpet, but I get high end pad with vapor barrier for my rentals. 

Starting with the slab, it does not usually have a vapor barrier or the correct PSI concrete.

Of course, the tile and sheetrock were ripped out, vapor barrier, backer board installed, new tile properly laid and grouted. 

And they make organic vapor cartridges for respirators, you won't smell a thing!

Unless the money makes sense.I dug out a 500sf basement last year 2' down then put down French drain, vapor barrier, gravel concrete.

Environmental moisture vapor, within the air or being released from the ground, can easily collect on the underside of flooring.  

The environmental company stated that there were nosoil vapor issues present on the subject property but there werelow levels of contamination in the ground water.

That was the start We have went from: The Gold Standard The Paper Standard Now we have the digital standard Fractional banking needs to have a 12:1 ratio of real monet to vapor paper, 20:1 can workwith the way balance sheets work.

You could maybe cut that cost by making one of those lights a motion detector, but I think that a full time florescent bulb is going to be cheaper to run than turning an incandescent or mercury vapor off and on.I've got a dusk to dawn florescent security light that is 14 watts.

If you don't really know anything about construction,I'd suggest you begin my learning each element or part of a house, from the vapor barrier at the foundation to the ridge of the roof.