As far as I know, the building codes in my city don’t specifically prohibit a garbage disposal under anything but a kitchen sink. Or if they do, I can’t find the code about this specific situation. The NEC (National Electrical Code) only requires that electrical devices be accessible. The NSPC says pretty much the same thing. That means an electric junction box or device can’t be sealed behind a wall. I have some friends in the building trades that I usually defer such questions to, but they’re not sure either. If someone in the trades here can point to a particular code prohibiting this, I’d appreciate it. I live in a city in eastern PA, by the way.
And your comments are useful. Thank you. I’ll pass your advice to the client, the likes and the risks.