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It’s also pretty common in New England (Boston area especially) although almost unheard of outside that area in the U.S.

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We had rehab work done when we moved to a Boston area house and they skim coated everything with plaster as standard of practice. That is definitely not the standard anywhere else I have lived.

Another regional difference is they put the powder room light switch next to the door on the outside, why? Has anyone seen this in any other area?

It's a Massachusetts standard, explained to me as an early safety procedure before GFCI was invented -- and probably dating back to early exposed wiring. Separation of water and voltage.

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