I'm measuring up the wood to order for wood paneling in a room. Looks to be around 210sq ft. What percentage contingency should I add as standard for this - rough guess? It's more if I'm doing the work, less if a skilled contractor does it. Could be some wood wastage from cuts, mistakes with tinting, etc.

I'm trying to post this from my smartphone, using Chrome, and see no option to attach a photo. I'm installing baseboard trim in a room that has never had baseboard before. On one wall, a concave spot on one wall causes a large gap (almost 1/4 inch) between the wall and baseboard. Scrbing the baseboard does not seem feasble due to size of the gap. Besides, the baseboard is MDF and does not scribe well, as I see it. I can make the baseboard contact the wall by firmly pressing against it. However, I have detected a stud in the wall near the center of this gap, so regular nailing is not going to work. I am wondering whether anchor screws could be used. The idea is to countersink the screw heads in the baseboard and the probably cover them with spackling, wood filler, or caulk, and then paint over them. The only downside I see to this is that if a future owner of the house tried to remove the baseboard for any reason, they would not know about the anchor screws and could damage the drywall by trying to remove it. Your thoughts? Edit (note on using smartphone): I'm typing this edit from my computer. When posting via computer, I can click Go Advanced button and get the option to attach a photo. Does this option not exist when using a smartphone with the Chrome browser?