How much to knock a French Window through to connect 2 internal rooms?

[faraday]

I'm also asking about bathroom renovations in this topic! So bear with me.

This is the house:

here

We want to knock a 2 door french window in the wall between the dining room (who uses THEM these days?!) and the sitting room, we think.

I don't think it's load bearing (but it might be!) so what do you think?

Anyone?

We had this done about 3 years ago. Ours is a load-bearing wall so we needed a steel joist; it cost £500 including replastering one wall for a doorway 6ft wide. Best thing we've done here

I don't know about the doors but please ensure they take down the horrific curtain swags