So probably looking at £70 - £100 worth of trace heating maybe more by the time they have wrapped the pipe, plus insulation £30?. Still doesn't account for extra price when compared to my installation.
Plus my contractor and to cut a trench through the concrete drive at the corner of the house and reinstate with four bags of cement and ballast, £30?
Plus when I mentioned the neighbor that recommended him, the contractor gave the chap £20 commission without even blinking.
It was only one year ago. They were here at 9:30, gone at 4:30, two blokes. 5 cups of tea each, it is worth supplying lots of tea!
Perhaps your mole contractor has a super duper mole?
The neighbors who did their own pipe connection almost hit their gas main with the minidigger(long drive 20 odd meters, minidigger for one day only) and only missed it because my Dad jumped in to stop them. It wasn't hard to see where the gas pipe was, exactly where my Dad predicted, but it is easy to get carried away with a minidigger.
Their diy job cost a 25m roll of mdpe, minidigger for the day, 2 bulk bags of sand to surround the pipe, roll of marking tape and enough concrete delivered to reinstate the driveway surface. They used a 10inch angle grinder and SDS chisel to get through the drive way.
The contractor who moled mine was also a time served plumber, but has shifted his business to moleing instead.
I would bet regular plumbers aren't interested in digging trenches, or managing those who dig, and will happily connect the pipework and notify after you have dug and had it inspected. Might be worth a few quotes from those without a vested interested in using a mole!
I think the difficultly would be timing the inspection and the plumbers visit to coincide on the same day. Although since it is a quick job, it might be the kind of thing a plumber can do on the way home from his main job.
You would also have to find something to cover the trench with until the inspector arrives.
One other thing, the contractor used narrow bore pipe through the wall of the house and internally, after the stop cock, which restricted the flow rate, so I swapped it to the 25mm MDPE, and now I don't end up with cold shower when somebody pulls the toilet flush!