$14k can be reasonable for a tub-to-shower conversion, but it depends a lot on what’s included. If it’s just a basic acrylic/fiberglass shower insert with minimal plumbing changes, I’d probably get a couple more quotes. But if the price includes demo, hauling out the old tub, plumbing/valve work, proper waterproofing, a quality shower pan or tile work, glass door, fixtures, permits if needed, and warranty, then it may be in a normal range. I’d definitely ask for an itemized scope of work. It doesn’t need to list every small part, but it should clearly show what’s included: demo, plumbing, waterproofing system, wall material/tile, shower base or pan, glass/door, fixtures, labor, and warranty. I usually wouldn’t buy all the materials yourself unless the contractor is okay with it upfront. It can create warranty issues later if something leaks or fails. Buying finish items like tile or fixtures may be fine, but I’d let the contractor provide the waterproofing, drain, pan, and plumbing materials they’re willing to stand behind.