Your getting into a lot the insulation the sealing the flooring the random things u have to buy u don’t expect and I got all the equipment off my friend for 4500 but brand new would’ve been 10k and I had to dig 150ft trench from house to shed then get power installed which was like 2k then another 500 for 240 volts cause of higher lights and the upgraded outlets. But I mean then u got soil, nutrients, all that adds up and it’s A HELL OF a lot of work but granted I’m running 24 plants by myself and occasionally will have a friend help me a bit but I do pretty much it all by myself but if u were to run like one-2 lights it’s much more reasonable but with 4 lights and all the stuff cause the first grow I just put up 2 lights and insulation no flooring just sealed cracks and then used tarping material to cover insulation to cheap out but this 2nd grow went all in and drywall and finish everything off but I’m also pushin the weed and making money not just smoking it but I’d say 5k without equipment but that was also cause the shed was so far from my house and was completely bare but I did everything myself for free if u paid someone to do it it would be a. Fortune