26 Oct 2020
Reaction score
United Kingdom
Afternoon guys,

I am opening up an old chimney breast that was blocked up years ago. The reason is twofold - ventilation (it wasnt vented!) And decoration.

The new opening will be 400mm wide x 600mm high which is smaller than the original so I'm only knocking out 'infill bricks' and not any of the original chimney structure. This means my new opening is approx 2 courses below the original lintel.

Here's the question - do I need a new lintel below the original? From what I can tell it will only be holding up two bricks.

I dont want to cut corners but also I dont want to create extra work for myself. As the bricks arent loose do you think a decent bit of strong render will do?

I should clarify - this will be a decorative fireplace only and is not intended to be functional. In fact hidden behind I will box it out and add a vent.

Any advice here would be really appreciated.

Thanks in advance! R

(Pic shows the work 90% done, just top right to tidy up and bottom course to knock out)

Last edited:
Sponsored Links
Updated pic ...

Raised the opening another course - existing lintel is some sort of metal strip, likely iron I think.

If it’s only decorative you could use a wooden lintel but your brick course needs support

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links