new build, newb to HA

an electrician would know exactly what this means right? I mean I do, but I don't think I should have to explain this... (since the sales agent was clueless of course...)

any reason why they might charge extra?

Yes. If the electrician doesn't know what it means, run away fast!

The building industry charges extra for any "change", so yes, they will try to charge you extra. However, the extra charge should be minimal, as in less than a dollar per switch.
 
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