Wow. Lot's of questions. I'll tell you my experience. I purchased a used and erected 8 x 15 Sunglo that is sold as a kit. My son and I had to take it apart and then rebuild it. It has aluminum framing that is riveted together. I had hoped to move it in sections but it really needed to come completely apart. It was probably easier to construct from having deconstructing it than it would have been doing it from instructions. They had a contractor put it together origionally in two days. Plan on two long ones.
They had theirs on a slab. The water (hot and cold) was plumbed and the electric run underground. It came with the exhaust fan and power vent. Since I am a lot less affluent, mine is on a wood foundation made from landscping ties buried a few inches in the ground. I have paving stones over 4" of mulch for the walkway and 4" of lava rock over weed barrier cloth everywhere else. I ran a hose from the spigot under the foundation and to a y splitter for the mist system and a separate watering hose inside. I will probably water in winter with a pump sprayer that I fill in the house. My electric is a 120 line from the house on it's own circuit but just outdoor rated wire laying across the ground. (Not in any type of traffic area.) I will make more necessary modifications as time and budget allow but it's working so far. I also expect this setup to be temporary as I'm back living with a aging parent so I've done some things I otherwise wouldn't do if I owned the house.
Your greenhouse isn't going to be very big at 100 - 150 square feet but spend a few extra bucks to do it right and you'll be more satisfied. I'm a handy person and don't mind going back and installing new things after the fact. I'm probably going to put in a natural gas heater and move the plumbing and electric underground with the gas line when I dig the trench.
Good luck! It's stressful the first year!
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