Mulling over a job we are having done in a few weeks. we've got an old Ideal boiler that is due for replacement. So speaking with my nephew whos a plumber and his mate whos a Valiant boiler installer I have decided to take the plunge and have a new valiant boiler fitted. As the current central heating system is at least 30 years old they are changing the rads too, 6 in total which are scabby as hell and defo need to go, now the issue arises. The pipes going to all the current rads is 10mm and i've been informed that this will also need to be replaced / upgraded with 15mm meaning the floor in the bathroom which has just been layed needs to come back up not a cheep floor either also the expensive floor in the main bedroom also has to come up hopefully without damaging it. The quote for the job made me swollow hard £3500 but am assuming this is a ball park or even family rates price? Downstairs the boiler will be sited in the corner of the kitchen ( Small kitchen I might add ) there is a sink there but no window so no issues re vent and the sink will not be directly under the boiler there will however be a fused spur under the boiler which I believe means the sink needs to be at least 300mm from the spur. Not looking forwards to having to take the floors up but as the kitchen is also ancient this is also being replaced with a built in kitchen so need to get the boiler fitted befor we can consider having the new kitchen fitted.