It's common practice to run gas pipes outside from a meter box to the entry point for the kitchen/boiler. I have seen some that go around two sides of a house.If it's a sraight run you could hide it a plastic cable conduit trunking strip if it matches the outside of the house (rendered) or use a cable guard.

Brother in law had it done last year.20mm or 22mm whatever size it is.

His gas meter is at the side of the garage so they fitted the copper pipe on the outside wall all the way down to the kitchen and in that way.

It is open to all weathers so not sure how long it should last without any sort of decay.

The pipe itself should be ok just wondering about the soldered connections in the frosty and cold weather.

Looks like they are doing the same with electric cables as well.Wife's friend just got her house rewired and they took the wires out of the house through the wall and ran them round the side of the building the same way as they do the gas pipes nowadays.

I suppose it saves a lot of mess but it is not the way I would like to have mine done.

Running gas pipes on external walls is a common practice, and complies with Gas Safe codes of practice, so no worries there, as long as the pipe run goes by the shortest possible route, and is properly clipped to the wall. As your installer is Gas Safe registered I'm sure that will be the case. He should sleeve the pipe through the wall in a plastic conduit, by the way. This can subsequently be filled with expanding foam to seal any gaps.

There will be no danger from frost or weathering - the pipe will do good service for many years.

One quick point worth knowing. Modern combi boilers have self-moderating burners, and when they go at full blast there's a considerable gas demand. In some cases where pipe runs are long, or contain multiple changes of direction it's advisable to run 28mm pipe from the gas meter to within a metre or so of the boiler, especially if there are branches that feed a hob, or any other gas device. The reason for this is that a big demand from the boiler when it fires up can cause a sudden drop in flow to the ancilliary devices, and if a hob is a few years old it may not have a flame-failure device. This could mean that a hob burner that is on a low setting could go out, and then, when flow is restored to normal it could allow unlit gas to escape into the room. It's unlikely to happen in most modern homes, but it's worth mentioning. Gas regulations are very strict on these matters.

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[I hope the electric cables were enclosed in round PVC conduit, carefully clipped to the wall]

They were covered but by what I am not sure as we have not seen it yet and are going by word of mouth.

Richard.Sole

Nice neat job.But like anything else that should not be there it tends to spoil the look of the house.

But I suppose all of us will have to have the same done eventually when we modernise our systems.

I had a new back boiler fitted in my fire about 5 years ago so that should last another 5 years or so.Pipes were already there so no new gas pipes were needed.

I must admit the old metal gas pipes that are in my house do look a lot stronger than the copper ones nowadays especially when they are outside in all weathers.

I suppose it is down to time money and mess it would make if running the new pipes inside the house.