I'm wondering this in regards to permits for locations.

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A portrait studio will be classed as a business. Any photography where a fee is payed is 'commercial' photography. Chris

It definitely is if you plan to charge for sittings and/or production of portraits. I suggest that if you are serious, contact a lawyer, form a corporation (many advantages), obtain Federal I.D. number and whatever local license/permit may be needed. I wish you well.

Technically, no... It's considered portrait/glamour photography. Commercial is more for businesses taking real estate, product, etc. photos for commercial/marketing purposes... You're jus' doin' personal photography now. If you're worried about what to define a location used for photography as, I'd say it'd hafta be classified as commercial, unless you shoot at home.