cbr I'm out of step with many of the others on this one. I prefer to visit up front, to check/advise if anything like position is likely to be a problem.
Mounting isn't a big deal as long as the builder can get a fixing in the wall. I'd say that I was going to hang on it myself and try to pull it off the wall. Not had a problem yet.
Lay gas pipe if you like but don't join it - I want to inspect for burs and use the right flux. Air test the pipework (please) but don't put water in it.
Provide proper drain cocks or I walk.
Drill the hole for the flue by all means. Then it's like it's my job with the builder doing the plumbing and labouring. No problem.
But it's the most expensive work I ever do. I spent thousands on qualifications and carry the can, and come back if there's problem within the first year. A trained monkey can put a boiler in and get it going - that's not what you're paying for.
Mounting isn't a big deal as long as the builder can get a fixing in the wall. I'd say that I was going to hang on it myself and try to pull it off the wall. Not had a problem yet.
Lay gas pipe if you like but don't join it - I want to inspect for burs and use the right flux. Air test the pipework (please) but don't put water in it.
Provide proper drain cocks or I walk.
Drill the hole for the flue by all means. Then it's like it's my job with the builder doing the plumbing and labouring. No problem.
But it's the most expensive work I ever do. I spent thousands on qualifications and carry the can, and come back if there's problem within the first year. A trained monkey can put a boiler in and get it going - that's not what you're paying for.