Monticello 8 ft. x 20 ft. Black Greenhouse-Mont-20-BK - The Home Depot
Message to Our Customers


Model # Mont-20-BK

Internet # 203192075

8 ft. x 20 ft. Black Greenhouse

Monticello 8 ft. x 20 ft. Black Greenhouse

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

$3,999.99 / each


Model # Mont-20-BK

Internet # 203192075

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 .2 mm), 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.

  • Heavy duty extruded Aluminum frame construction finished with electro statically applied black paint for long life, entire greenhouse proudly made 100% in the USA
  • High impact, UV stable 8mm commercial grade twin wall polycarbonate walls and roof construction
  • 1200 cu. ft. of space, plenty of space to grow your plants and vegetables
  • Through a combination of using superior materials that are more rigid and creating interchangeable parts in our design the Monticello takes the average gardener 10-12 hours to assemble the 8ft x 20ft greenhouse while using much fewer parts. This does not include the base prep work needed, which includes leveling the ground.
  • 4-Automatic opener Roof Vents (2 ft. x 2 ft.) opens and closes based on interior temperature to help prevent plant wilting and dry out
  • Integrated flush base Design allows for lower than normal door threshold
  • A-frame roof design to optimize heat disbursement along with roof joist supports that double as hanging plant rods
  • Hinged lockable double doors
  • Greenhouse dimensions: 8.1 ft. W x 20.4 ft. L x 7.6 ft. which includes thoughtfully appointed structure including built in dual rain water collection system gutters
  • Solid commercial grade aluminum along with polycarbonate walls and roof construction assures no rust to the greenhouse
  • 10 year limited warranty on the entire greenhouse the strongest in the industry
  • Expandable can be expanded by using the MONT-4-BK Expansion Kit which allows your greenhouse to grow as your needs do
  • Efficient average cost to run greenhouse year round ranges from $175 - $225
  • 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.) 
Approximate Greenhouse Height (ft.) 
Approximate Greenhouse Width (ft.) 
Assembled Depth (in.) 
249 in 
Assembled Height (in.) 
90 in 
Assembled Width (in.) 
97.5 in 
Door Opening Height (In.) 
Door Opening Width (In.) 
Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Assembly Required 
Floor Options 
Floor Options 
Without Floor 
Foundation Included 
Frame finish family 
Lockable Door/Gate Latch 
Number of Doors 
Number of Vent Openings 
Product Weight (lb.) 
400 lb 
Shelving Included 
Storage Capacity (cu. ft.) 
Warranty / Certifications
Manufacturer Warranty 
Limited 10 Year 


Rated 4.0 out of 5 by 1 reviewer.
Rated 4.0 out of 5.0 by Great Greenhouse Bought this greenhouse last fall.I used a different footing because I wanted more strength. used 4x8 treated timber. From HD. This gave me the assurance that I had a lifetime footing and I could line up the Base plate on the timbers. I set the beam's on 8x16 concrete blocks and then I set a form up a few inches away and poured concrete under the Beam. The greenhouse went together smooth except for an Ice Store that came to Dallas. The plan's said to do the work in one day. It took me a couple of week's.I have included pictures of the construction. The house is strong and has had 60+ wind but without the the smallest movement. The door will have to be reengineered. I have talked to the factory about all of the questions that came up. They could not be nicer people. The manager even gave me his home phone # if I needed to call after hours. I grew my first crop this winter. I would not consider any other house. I did a lot of research before the purchase. And I'm also a retired Pro Grower. You can buy this product without worry about problems. Sorry no pictures. As usual the site doesn't work. March 30, 2014
  • 2015-05-04T11:09:00.889-05:00
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