What type of wall is this?

[selim]

I'm considering buying a property with the back garden on the side. I'm trying to understand as to whether I can replace the small window with an arched patio door to maximise day light and the view of the garden. The chimney stack on the left is a real one but the one on the right is fake. There's actually a cabinet that's build on the inside. Also the outer wall of the upstairs bedroom aligns with the brick wall. I saw another property with the same plan and it has a window opening on the fake side. The property was built in 1999 and I'm trying to understand (1) the structure of the cavity wall (is it a multi layer cavity wall? is the arched stone functional or just cosmetic?) and (2) whether it's required to have a lintel / steel installed to enlarge the opening. I understand that a site visit is required to tell for sure but I'd appreciate if I could get an opinion on this. Thanks!

 

 

[DevilDamo]

You would need a lintel to modify the brick wall opening and the whole job would appear to be a lot of work for minimal gain as you would need to insulate the floor and walls.

 

Why not just have an arched window or door that is of the same profile as the brick arch but position the opening on the main/pink wall line?

[selim]

The plan is indeed to make an opening that has the same profile which is why I wanted to understand the structure and see how feasible/costly it would be.

[DevilDamo]

The only way to know is to expose it.