Water
Place the washing machine and the dishwasher as close to the existing water supply as possible. The water can be supplied hot or cold, depending on the appliance and the general water system in your home. If the water arrives hot you save time, especially with an automatic machine which empties after every cycle.
On the other hand, extracting water from your household system will rob your central heating or bathroom of hot water. Appliance manufacturers usually state whether hot or cold water should be used. To obtain water from your main supply, form a junction at a convenient height in the existing pipe. The plumbers should insert a stop-tap in the extension pipe so that the machine can be moved without having to cut off the water supply to the whole house.
Appliances are fitted with a flexible hose for easy connecting and tolerance when finally positioning the machine. You should try to conceal pipes from general view wherever possible. Machines should be filled at the water pressure recommended by the manufacturers.
Consult your water board for local pressures, and they will advise you on the kind of regulating valve you will need, if any, A water softener may also be needed in some areas.