Great, and important thread. All of these ideas/tips are excellent. I wonder how insurance companies handle (or don't) things when an indoor grow room causes a house fire......
I know my strengths and I know my weaknesses, and electrical work isn't on the strengths list. So I got an electrician to test things, improve/upgrade.......from the start of the house, to the wiring infrastructure (mice.....not good for wires in walls), to GFI boxes, surge suppressors, where lights are plugged in, the quality of wiring, plugs, timers.....all of it needs to be tight. Smoke detectors, fire alarm system, and a plan. What is going to happen if a fire starts and you're not there? No one is there.....
Then there's plumbing. Electricity and water usually don't mix well, and I look at it like circles that overlap.......congruent?.....there are those areas where two worlds mix. Then there's heating/ air conditioning, which uses electricity.......if you're going to have a line hooked up to run a hose to your garden, with filtration, Ph adjustment, etc., it's probably good to have a plumber hook it all up. I had him connect a spigot through the closet wall. That can't flood or splash/spray anything electrical.
Fire suppression tanks above the lights. Sprinklers will put a fire out, but who's gonna shut off the water? A flood when it's 10 below 0 would not be good......
Chemical fire suppression tanks would solve those problems. The concept of CO2 though, that's potentially even neater, provided it's thorough. These fire-delaying building/wall boards are another great idea......
So it's worth having a few professionals test, work on, and upgrade things.