It is becoming more common these days to have an en-suite. The benefit of being able to nip out of bed straight into a bathroom is now seen as a standard rather than a luxury for many.
For most of this it means either using the box room or corner of a bedroom with the resultant space being fairly restricted. Using a standard bath suite becomes rather difficult so manufacturers have started to com up with designs that enable small spaces to be utilised to the full. For instance consider the use of a corner toilet, basin and shower enabling the corner of one room to be used.
On a new en-suite care will be needed in the siting of the room. Although macerators give more flexibility they tend to be too noisy for use in a room that is part of the bedroom. This means the en-suite will need access to the soil pipe or one will need to be fitted with a sewer drain. The input pipes, hot and cold will also need to be considered although for most en-suites they can be run through the loft space.
It is worth noting here that a new bathroom will need to meet and be given Building Regulation Approval for electrics, drainage, ventilation and any glazing. They are not onerous and there to ensure protection and safety. The cost varies depending on the work being carried out. If the Tradespersons is part of a scheme then then the work can be self certified. For instance an election registered with a body like ELECSA or NICEIC will be able to certify the electrical work and a certificate will be sent to you. The Government Approved Documents for England and Wales Building Regulation can be found here: Building Regulations
See the Ideal website for some ideas:
Ideal Standard Small Bathrooms