Does anyone know if installing siding over existing stucco in LA is allowed? I cannot find anything telling me either way.
I would recommend calling your local building department. They can point you in the right direction.
I'd suggest calling Hardie directly or reviewing installation guides on their website.
I don’t know the rules, but after much consideration we gave our contractor the go-ahead to do it on a remodel of our two story primary residence in Sherman Oaks back in 2004. Not a single issue to date and saved a lot of money.