Advice on wall strength for lintel..

[Jason-m]

I have just moved into a property that had a strange extension on the side and rear of the house but with no access other than through the old front door into the extension passage..I noticed today that in the lounge which the extension joins onto there was a studded partition so i ripped it out and found this (see pic. ) the extension lintel seems to be sitting on one skin of bricks, as you can see in the photo it is for a single storey extension and is just holding joists and roof, i want to cut part of the brick wall out so i can use the extension via the house, if i chop the section of wall to the right of the joist will the remaining brickwork still have enough strength to support the lintel as it will be basically a brick and a half wide, if not what could i do to strengthen the small wall that would be left..?

 

[catlad]

I can not see a lintel in your pics.

 

[Jason-m]

picture 2 under beam you can see the lintel

 

[catlad]

The black bit is that the end of a catnik lintel.

 

[Jason-m]

It is...if i remove the patio doors from the extension and brick up the hole with a window in it, would i be able to cut back further on the house internal wall due to the fact that i would be supporting the lintel crossways from where i brick up the patio..?

 

[catlad]

Is that stud work an old window bricked up, something looks a bit odd to me, you would be better waiting for one of the builders to advise.