1 According to an annual construction cost survey by Remodeling Magazine, a mid-range remodel of a 5x7-foot bathroom averages $14,109-$18,864; for an upscale expansion of a 5x7 bathroom to 9x9-feet within the existing house footprint, costs run $46,865-$59,456.e spent $3,385.00 on labor for total gut and some drywall, this also includes tile work, plumbing and electrical work. We spent $3,055.14 total on materials which include a deep soaking bathtub, with wall surround, new Kohler toilet, beautiful tile for the floor and tall vanity which we got at Lowes.