I built my "grow box" about 2 years ago, converted my useless cold cellar which has 9" thick concrete walls/ceilings/floor. Total space is a 4x9.5x7' flower room, with another 4x4.5x7' area which holds a veg cabinet and enough space between the two rooms to hang/dry. The best part of converting a cold cellar is temperature management is easy, the second best part is mine is directly below my front porch, which has a 10" thick concrete slab. I've had cops come to the door, literally standing on top of my "grow box" with no f'n clue that I had a room full of plants directly under their feet. Love it
Before:
View attachment 3536274
After:
View attachment 3536276
Fuck grow boxes...