How much does electric underfloor heating raise the floor height?

[WishIwas19again]

Mid bathroom renovation. Our builder has just told us our plans to install electric underfloor heating will raise the floor height around 5cm.

Has anyone any experience of this? I'm worried about the transition between the carpet in the hallway and the new bathroom floor. Will it look weird?!

Questioning whether to scrap our plans, but worried tiles will be cold? Only ever had vinyl floor in bathroom before so tiles were a luxury I was looking forward to!

We had it in our kitchen and bathroom and it didn't make any difference.

Did they lower the floor Tricky? Or does it just run into the adjoining rooms quite seamlessly?

The insulation boards are about 1/2 cm, the actual heating elements are thin thin, so I think most of our height was from the tiles.

There was a huge thick carpet throughout the ground floor so once that was removed and the underlay I think we probably increased the floor height by a CM.

5CM sounds mad even if you're going from a bare floor.

The heating we had was a copper wire which was taped down and incorporated in the file adhesive so no extra height.
There are loads of different systems though.

It only made a difference of less than a cm

Thanks everyone for the info and reassurance! Sounds unlikely there will be such a big jump up then.

I wonder if our builder has got the dimensions wrong, it's the tiler who is fitting it tomorrow so I'll maybe wait to chat to him. Hopefully it's a misunderstanding.