Monticello is Proudly Made in the USA!! The Monticello Greenhouse is easy to assemble with their patented attachment system which eliminates hundreds of parts. The Monticello assembly depends of skill level and location preparation, most assembly takes 3 days once the location has been prepped, a small price to pay for a professional grade greenhouse that will last for years. The Monticello is a commercial grade greenhouse that is designed to last. Don’t let the ease of construction fool anyone, this is a sturdy permanent structure that will give the owner years of satisfaction. The Monticello Greenhouse comes with a 10 year Warranty, one the strongest in the industry.