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i've seen old fireplaces transformed into modern works of art. i have an old fireplace and would like to change the opening from a huge square to a more contemporary rectangle. i know the concrete/brickwork can be done but is it advisable or even allowed w/o an inspector? we live in southern california.

I have a wood burning fireplace and I know that any changes require a professional. I want to cover the old fashioned brick with stacked stone and will have worry about the firebox and fire retardant materials. The bricklayer who the tile shop recommends specifically states that he doesn't use any materials that will cover area that might come into contact with heat and or fire. Don't know about your area but this may be something to ask a professional about.

I wouldn't recommend trying to change the aspect ratio of the firebox opening. Any brick added to the top of the opening will have to be supported by a steel lintel and will have to be done with fireproof mortar. Matching the color of the existing brick and mortar will be difficult.

I'd ask a friend or family member on the local fire department about the inspection requirements, just as a first step. Otherwise, just call the building department directly and ask.

Bob's right about the lintel. I've seen this done a few times. Typically, a second lintel is set below the first.

If the firebrick gets a rework, they usually blacken the entire inside of the firebox to cover it.

Normally, there isn't much issue when you decrease the firebox opening area, as far as codes go, and the main concern is making sure the firebox work is done safely, and the flue design works safely.

Around here, that means yes, inspection is mandatory.

Regards.

I like your idea, changing the old square to more contemporary rectangle, I am not really an expert for this but I also did asked an opinion to my friends, they also advised me to ask the experts and I did that, cumar did all the remodeling ang changes in my house. I think there are tons of experts here that is why I like here. The people are great and I love reading their advises because I learn something new, unique ideas and things that it is only free, (their advises).