I always do a full estimate by counting up every stick, every sheet, all of the other materials & supplies and every hour. The last project was two 40" wide X 84" tall X 10"deep bookcases, with solid oak facing and oak plywood cases, adjustable shelves, no doors, stained and varnished. Delivered and installed for $1500. It took 4 days. The labor was $800. I needed the work at the time so it was OK. I can make more $ doing home repairs and remodeling.