When I was on "extended vacation" a couple years ago I was a weekend lead-generator for the local 'Re-Bath' franchise. Previous customers aproached me on the job and told me they were happy with the work. I am no longer affiliated with them but still have my info packet. Their website is
www.rebathnh.com 603-625-0303. They are based out of Manchester but they work all over NH, sME and neMA.
They will do the bath area, or full bath remodeling. They will need to send an estimator but if you want to see their mockups, they have a showroom at 61 Elm Street in Manchester. IMO they are a little pricey (don't tell them I said that, I was supposed to say they were '"economical" for the quality') but they have a life-time warranty.
They used to have a rep that my wife thought looked like "Val Kilmer," but I digress...
Good luck!