You need to check your math, 4'x8' = 32s/f per sheet at .25¢ s/f that's $8 a sheet, which is a tad low board cost. My latest price sheet from supplier 1/2" 4' board delivered is .27¢, regardless of the length of the sheet. Then you have to add in the costs for mud, tape, bead, fasteners, glue, backers, and primer. Materials are gonna run .30¢ at least, labor end around this neck of the woods, you charge much more than .60¢ a s/f and you're going to price yourself out of the job, to much southern labor force in this market, they don't speak much english, but they do reasonably quality work for a dime less than that. They can't work for me, maybe I'm funny, but I feel like if you're going to live & work in this country, you should at least learn to speak our language, but alot of the bigger outfits in this part of the country don't seem to care what language their subs speak & by them being subs, not employees the company gets around proof of right to work legalities. In other words they don't know or care if the guys hanging & finishing their board are US citizens or have a green card. But these guys will work in god awful conditions.
Couple of yrs back things were unusually slow, even for mid-winter, I call around and locate a large outfit out of Columbia, about 90 min drive south of me, they have plenty of sub work on a huge new apt complex, nearly 2,000,000 s/f of bd total. Great news, so the next morning I load up the tools, equip, & crew & we head down there at 0 dark thirty, get to the site at 7am. First thing I see is a swamp, literally 8"-10" of mud all over the site, 3 different 4wd p/u from various trades already stuck blocking the "roadway" into where we need to get to. We see a crew of mexicans sloshing thru the mud with their pouches towards the bldg where we were told to start working at, then I noticed the real kicker, these fools are hauling their benches up a homemade ladder in the breezeway, that's right the stairways weren't even installed yet!! Needless to say I turned around & came home. If this is what the Pres is talking about when he says these people are coming here & taking jobs that Americans don't want to do. He's right I'm not going to work under those type of conditions and I certainly wouldn't expect my crew to either. On the way home that day I seriously thought about giving OSHA & the I.N.S. a call.
Sorry about the rant, getting back to the topic at hand, I've never figured costs or rates by the sheet, I see that type of pricing being used by alot of guys on the east coast from postings I've seen on the W&C msg bd and drywallflorida.com boards. Got to go give a bid this morning, but I think I'll sit down & do the math on it this afternoon. I'll post back my findings then.
Let's say materials are $0.25/sq.ft - this would translate to $24 per 4x8 sheet.