Each bathroom installation will be valued differently. The time required to finish each job will differ depending on several factors. Size and difficulty of installing components will have an impact on the cost, as well as the number of things that need fitting. The more work that needs to be done, the more expensive your bathroom installation will be. A straightforward bathroom retrofit carried out by a plumber could cost you as little as £1,000, whereas an entirely new space complete with new heating and tiling will cost far more. The cost can range between £6,000 to £6,500