DIY Q&A
Solid wood must be protected under several layers of varnish or paint. Even then, if water ingresses between the boards it can move. There are laminate floors suited to bathrooms, but most are water-resistant not waterproof, so don’t let water pool on any laminate or the sections can swell. Try AquaLOC, from B&Q. A vinyl wood effect would be far less of a headache and highly economical, too.