I put this up outside in the shed but due to no safety mats underneath and it being the colder months so grass isn't an option atm we decided to put it up inside. Honestly best decision I have made as a parent lol my asd 4yo has stopped climbing my cupboards and almost everything else which is amzing because shes been a climber since she was 1!! She's fallen asleep in it once(idknif that's recommended honestly) but she spends upto 4 hours a day on and in it sometimes and considering this was paid using carer support it has definitely brought me the relief I was hoping for. Amazing strong and sturdy I'm 93kgs and the den and climb frame holds me with ease