My experience with Lowes' carpet installation was shocking and insulting to decent, honest people. Thankfully, I halted my purchase and will never buy carpet from Lowes.
On a room that measured 11' 4" by 19' 4" (rounded up to 12' by 20' - 240 square feet), Lowes told me I needed 300 hundred square feet of carpet from a 12-foot carpet roll. Using a 15-foot carpet roll, Lowes told me I needed 375 square feet of carpeting to cover 240 square feet!!
Further, when I asked for the measurement chart for which I'd paid $35, I was told I couldn't have it and that I'd only paid for the estimate, not the drawings! Buyer Beware of this overmeasurement tactic.
Product or Service Mentioned: Lowes Installation.