Gain extra space by expanding historic bathrooms. In some cases, a larger bathroom may be possible by moving a wall. Check to see if you can gain a few feet by incorporating a closet space into your bathroom or taking on part of another room. Consult a contractor to make sure the wall you want to move isn't structural.
Preserve historically significant features. If your bathroom floor is made of beautiful old hexagonal mosaic tiles or contains beautiful wood molding, invest a little elbow grease in repairing these defining characteristics. In most cases, it isn't feasible to replace these elements with modern equivalents, which are often far less superior in terms of craftsmanship.
Update plumbing fixtures. Many historic bathrooms were renovated in the '70s or '80s and feature older toilets and bathtubs that aren't water-efficient or even attractive by today's standards. Consider replacing these outdated fixtures with new, eco-friendly versions. If you are set on antique plumbing fixtures, visit an architectural salvage yard to find period-appropriate models.
Complete the bathroom remodeling project with a fresh layer of paint. Scrape excess old paint from the walls, millwork and wood trim. Grind them smooth with sandpaper while wearing a protective face mask. Prime and paint with a few fresh coats. Take the time to research the original paint colors within your home, or at least determine popular shades for the time period if you are aiming for a historically accurate renovation.