Plan your pipes to run on the surface or under the floorboards. Remember to make sure that all pipes vent to the radiators otherwise air locks will be created and the system will not work. If you do run pipes under the floor mark the area they are installed in so nails do not damage them. The fittings can be compression joints or capillary joints. These are soldered using a blow-torch. Remember if you do use a blow-torch protect flammable materials and check that the solder has properly run around the joint otherwise you will have a leak.
Allow room for the pipes to expand and contract. Also don’t make a too permanent feature of concealing the pipes because one day you may have to maintain them.
Route the pipes back to the boiler and also ensure that the system has a cold feed and an open vent pipe connecting to the feed and expansion tank which is usually positioned in the roof space.