I have a bit of an odd question for you good folks.

I've been talking to people on my parents' block, because there's an issue in their neighborhood with homeowners turning their front lights on at night (in that they don't do it). Recently there was an attempted car theft, which (fortunately) is almost unheard of in that area. Long story short, I'd like to set them up with some automated lighting, and they'd like me to do it for them.

My question is, are there codes against me fiddling with light switches in other peoples' homes? Do they need to have an actual electrician? I won't be doing anything other than turning off some circuit breakers, taking off some wall plates, removing old switches, and putting new ones in.

I've done this a dozen or so times myself, so I know what I'm doing. I just want to make sure that this is above-board. I've started my own business and I want to make sure I'm not doing anything wrong.

So is that okay? Is there someplace I can look to find out? If it helps, this is in Fairfax County, Virginia.

Thanks for your help.