Internal water pipes under concrete floor

[Johnners]

Hey guys
I’ve gutted the bathroom and I’m moving things around. I’m looking at putting a basin on a wall which never had a basin on it before.

I’m wondering if I could channel out the concrete floor and run the hot and cold water feed via PEX speedfit 15mm in the floor then concrete back over it?

is that safe? I’m thinking only just under the surface so it shouldn’t be an issue with freezing in the ground etc although this is the first time I’m looking at this so I’m more than happy to be told that’s a stupid idea

 

[Johnners]

The alternative would be running the pipes in the roof space and back down a channel in the walls.

i probably should also say the room is about 1700x1500 so the length of pipework is pretty short runs.