Creating a doorway

[ECP90]

Hello, 

 

I am going to make a doorway between my bathroom and bedroom, making it ensuite. 

 

I've been watching a few videos and reading about how to do it. It seems doable even for a DIYER.

 

This post is looking for any information people can share about making a doorway. 

 

Points I've noted down, standard UK doorways are 826mm wide. Anyone go bigger? Lintel above the doorway is extra 100mm either side of the door. Would anyone go bigger? What thickness would be acceptable?

 

Above the wall where the doors going, there is only one beam across it. A builder had a look at it and said there no structural issues/its not supporting anything about it. 

 

Any thoughts/information would be much appreciated. Thanks. 

 

[Russell griffiths]

Minimum bearing for a concrete lintel is 150 each end I believe. 

[Oz07]

1 hour ago, Russell griffiths said:

Minimum bearing for a concrete lintel is 150 each end I believe. 

I think thats rule of thumb but can go smaller like maybe 100mm in some circumstances. I'm sure I've seen it written down before. @Gus Potter

[Nickfromwales]

100mm in concrete is fine.

[ECP90]

1 hour ago, Nickfromwales said:

100mm in concrete is fine.

 

How thick would you say it needs to be minimum?

[Nickfromwales]

1 hour ago, ECP90 said:

 

How thick would you say it needs to be minimum?

How thick for what? Wall or lintel?

 

The reference to 100mm is for each end of the concrete (pre-stressed) lintel to be sat over 100mm masonry the same thickness as the lintel. 
 

For this, you’d be using a 3” x 4” lintel

 

https://www.diy.com/departments/expamet-concrete-lintel-l-1050mm-w-100mm/150790_BQ.prd