Putting a door from converted garage into the house

[eggtastico]

Currently have a converted garage with a door at the back that leads into the Kitchen. We are looking to block up this door for a Kitchen renovation & move the door to the foot of the stairs.

The ground floor wall is a single block wall with plasterboard either side & supports the joists for an ensuite bathroom (& possibly separate joists for the bedroom above garage - but I am 80% sure these joists run the length of the room instead of the width - plan to check a neighbours garage who does not have a converted garage) & Once above the joists the wall for the 1st floor is timber & plasterboard.

Just wondering if this is a specialist job, or if a competent DIYer can do it?
If the later, is a Lintel like below OK, or do I need a structural engineer?
https://www.wickes.co.uk/IG-Ltd-Internal-Steel-Lintel---1200mm/p/220067

 

[oldbutnotdead]

It is DIYable but is also notifiable (to Building Control). You'll need a couple of Acros & maybe a pair of Strongboys

 

[^woody^]

Is there room at the base of the stairs for a landing, and then the doorway?

 

[eggtastico]

Yes, lots of room - I have seen it done on another house we looked at before buying this one.

My main concern is a lintel. Not sure I want to task myself with cutting bricks horizontal more than I would have to.
Would a lintel like this be strong enough? It would be a one man (me!) job due to lockdown restrictions in wales
https://www.wickes.co.uk/IG-Ltd-Internal-Steel-Lintel---1200mm/p/220067

 

[noseall]

Would a lintel like this be strong enough?

No.
Provided there are no unusual loads a pair of 1200mm PCC lintels (cavity wall?) will suffice, for a standard door sized opening. We use a single Acrow and strongboy centrally. More to prevent droppage of masonry rather than supporting any loads.

 

[eggtastico]

Thanks
It's not a cavity wall. Just a single thermal brick as it was the internal wall separating the garage from the house.
Are there any advantages/disadvantages of a concrete lintel to a steel box lintel?

 

[oldbutnotdead]

Concrete are usually cheaper, fabricated steel are lighter to support the same load.

 

[^woody^]

That stupid metal lintel does not work to gauge and needs a lot of split bricks/blocks, but it's not really designed for retrospective use anyway, and needs to be built in and loaded as the wall is built.

 

[eggtastico]

Thanks, I thought steel might be lighter for me handle on my own, but I can do it with concrete.