"Hands On" wrote
| I was told that all new houses require toughned glass
| on glass panel doors up to 80 Cm from the floor.
| Is that so?

Applies to all new / replacement windows in old houses too.

| And when did this come in?

Several years ago.

| How would I know if the glass is toughened, as I can't
| see a mark on the glass? It is a French doors type of
| door with 10 panes per dooor.

There may be an exemption for small panes like that. I'm not sure.

Owain