Monticello 20 ft. x 8 ft. Black Electrostatically Painted Aluminum 8 mm Twin Wall Polycarbonate Greenhouse-MONT-20-BK-PREMIUM at The Home Depot



Internet # 203539427

20 ft. x 8 ft. Black Electrostatically Painted Aluminum 8 mm Twin Wall Polycarbonate Greenhouse

Monticello 20 ft. x 8 ft. Black Electrostatically Painted Aluminum 8 mm Twin Wall Polycarbonate Greenhouse

This item has been discontinued.
The Home Depot no longer carries this specific product.

$4,699.99 / each


In Stock




Internet # 203539427

Not all greenhouses are built the same and the Monticello line of greenhouses by Riverstone Industries proves this to be true. The Monticello is proudly MADE IN THE USA, applying good old American ingenuity to make the best product for our customers and help to elevate the industry standards of all greenhouses. Constructed from the highest quality extruded aluminum (US grade – not the thinner & more brittle foreign aluminum) and electrostatically painted Black (guaranteed to contain 0.0% lead), our greenhouse uses on average more than 85 lbs. more aluminum than the average imported greenhouse. Why is this important? The weaker the framework the less snow the greenhouse can hold in the winter time before collapsing on itself also the easier it will be get damages in wind. While most hobby greenhouses on the market us less expensive thinner walls and roofing materials (the crystal clear walls are as thin as .2mm), the Monticello uses professional grade 8mm twin wall polycarbonate. This is the same thickness as used in the commercial greenhouses. The twin wall polycarbonate acts as a double pain window keeping cooler air in during warm months and insulating the greenhouse from cold air in the wintertime. This not only makes the Monticello more efficient to grow in for a longer period of time than other greenhouses but it also adds to the efficiency of growing, cutting down electric bills for those who choose to grow year round.

  • 8.1 ft. W x 20.4 ft. L x 7.6 ft. H
  • Through a combination of using superior materials that are more rigid and creating interchangeable parts in our design the Monticello takes the average gardener 12 hours to assemble the 8ft x 20ft greenhouse WITH THE PREMIUM PACKAGE while using much fewer parts. . This does not include the base prep work needed, which includes leveling the ground.
  • Integrated flush base design
  • Premium package includes: Monticello 16 ft. green house Monticello work bench system Monticello interior shade system Monticello programmable watering system Monticello greenhouse sink system
  • High impact UV stable 8mm twin wall polycarbonate walls and roof
  • Heavy duty extruded aluminum frame construction
  • Black electro statically painted frame, guaranteed to last for at least 10 years
  • 4 - 2 ft. x 2 ft. roof vents with automatic openers
  • Integrated dual rain water gutter system
  • Hinged lockable double doors
  • Large 4.6 ft. wide door opening
  • Full 10 year warranty (strongest in the industry)
  • Expandable ability to expand greenhouse in 4 ft. increments as needs grow
  • Efficient average cost to run greenhouse year round $150-$200
  • Snow load capacity of 24 lbs./sq. ft. and wind load of 52 m/sec (113 mph gusts)
  • New Patent Pending Twist & Lock single bolt (makes assembly quicker and easier over prior version) (NEW for 2014)
  • Please Note - Allow for a FULL weekend to Fully Assemble (ground prep included), Two people suggested for assembly, Manual is fully illustrated
  • Proudly designed and made in the USA

Info & Guides

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Approximate Greenhouse Depth (ft.)  20  Approximate Greenhouse Height (ft.) 
Approximate Greenhouse Width (ft.)  Assembled Depth (in.)  244 in 
Assembled Height (in.)  90 in  Assembled Width (in.)  98 in 
Assembly Required  Yes  Floor Options  Without Floor 
Frame finish family  Dark  Lockable Door/Gate Latch  Yes 
Manufacturer Warranty  10 years  Number of Doors 
Number of Vent Openings  Product Depth (in.)  244 
Product Height (in.)  90  Product Weight (lb.)  505 lb 
Product Width (in.)  98  Returnable  90-Day 
Shelving Included  Yes  Storage Capacity (cu. ft.)  1216 



Curbside Truck Shipping (By Appointment) includes delivery to receiving area/dock for businesses or curbside for residential orders. The carrier will contact you to make a delivery appointment with a 4 hour window once the items have arrived at the local hub in your area. Delivery appointments are required.

If product is eligible for shipping to AK, HI and US Territories additional transit time and remote surcharges may apply.