Rerouting gas pipe

[LeeUK]

Anyone know a rough estimate cost to reroute a gas pipe in 2 places?

1. Pipe enters property and goes along centre of wall approx 1.5m length and then up into ceiling. Want it to enter property and go up corner of wall and along ceiling and then up into ceiling.

2. Where pipe comes up through ceiling into upstairs floor, it goes along bottom of wall about 1.5m length then up wall into ceiling/loft. Want it to come up through upstairs floor and continue directly up wall into loft.

I don't know what planet the gas fitters where on who originally installed the pipework. Pipe is a phat copper pipe.

 

[LeeUK]

It's after the meter. Boiler is actually in the back bedroom airing cupboard but the gas pipe goes up to the loft then along to the back of the house then down into the airing cupboard.

It couldn't just go up the outside wall as there is a flat roof extension in the way otherwise that would have been ideal. Also I wouldn't think all the pipe needs replacing, just the sections I want rerouting.