Position of new Utility/Shower Room

Hello Laura, The drainage is the most important and potentially the most expensive part of the proposed utility/shower room. Do you plan on putting a toilet in there? What is your ground floor fabricated of? Joist and floorboards? concrete? The further the shower room is located from all the services the more money it will cost due to the repair work needed when the pipes are installed through the house. An 8 meter run of soil pile will usually require a sub stack (an independent brach directly from the underground drainage). You will need a reasonable amount of space below your finished floor level to achieve the correct gradient (fall) on the soil pipe and sweep on the base of the sub stack. If you want the cheaper option (short term) then a macerator (saniflo) can be installed but it will cost you more in the long run as they are very temperamental. Especially when installed incorrectly, which they usually are. You will need an extractor fan unless you like mold. This will need venting directly to outside. The ducting for those are around 3 inches. So it may need boxing in if its running through other rooms. The wall directly to outside is your best option to keep costs down. You can spend more money on a better finish. Regards, Ben