Shower room installation costs can range from £2,000 to £9,000, based on the size, scale of design and plumbing configuration. This is when you need to do your homework on the furniture you ‘want’ as opposed to what you ‘need’, you may need to compromise? You probably know the online sites you have to trawl through to get an idea of what your budget needs to be? Then when you’ve made your decision it’s worth negotiating with the supplier/retailer to see if you can get a reduction.