Model # Mont-12-AL

Internet #203192060

Monticello 8 ft. x 12 ft. Aluminum Finish Greenhouse


8 ft. x 12 ft. Aluminum Finish Greenhouse

$268999 /each
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Frequently Bought Together

Product Overview

Not all greenhouses are built the same and the Monticello line of greenhouses by Riverstone Industries proves this to be true. The Monticello is 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 and more brittle foreign aluminum) and coated as not to discolor over the years (guaranteed to contain 0.0% lead), our greenhouse uses on average more than 55 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 0.2 mm), the Monticello uses professional grade 8 mm 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 in natural anodized aluminum for long life
  • High impact, UV stable 8 mm commercial grade twin wall polycarbonate walls and roof construction
  • 720 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 8-10 hours to assemble the 8 ft. x 12 ft. greenhouse while using much fewer parts, this does not include the base prep work needed, which includes leveling the ground
  • 2 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 12.2 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
  • Features a 10 year limited warranty on the entire greenhouse (strongest in the industry)
  • Expandable can be expanded by using the mont-4-AL expansion kit which allows your greenhouse to grow as your needs do
  • Efficient average cost to run greenhouse year round ranges from $125 - $175
  • New patent pending twist and 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), 2 people suggested for assembly, manual is fully illustrated

Info & Guides

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Approximate Depth (ft.)
Approximate Greenhouse Depth (ft.)
Approximate Greenhouse Height (ft.)
Approximate Greenhouse Width (ft.)
Approximate Width (ft.)
Assembled Depth (in.)
145 in
Assembled Height (in.)
90 in
Assembled Width (in.)
97.5 in
Door Opening Height (In.)
Door Opening Width (In.)
Exact Width x Depth
8 ft 1.5 in x 12 ft 1 in


Assembly Required
Floor Options
Without Floor
Frame Color Family
Greenhouse Features
Door latch,Lockable door/gate latch
Installation Available
Maximum Roof Load (lb./ sq. ft.)
Maximum Wind Resistance (mph)
Number of Doors
Number of Vent Openings
Product Weight (lb.)
Storage Capacity (cu. ft.)

Warranty / Certifications

Manufacturer Warranty
Limited 10 years

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Customer Questions & Answers

I just bought the 8 x 12 greenhouse and am assembling the wood base. Can someone explain why I need 14' 2x4's for a 12' greenhouse?

Asked by: mi8
The greenhouse is slightly bigger than 12'. A 12' 2x4 wouldn't be long enough for the base. I was also confused at first because the directions call for uncut 14' 2x4's, but you actually do have to cut them.
Answered by: mi8
Date published: 2016-09-20

what is the snow load rateing

Asked by: cal
The roof load is 24 lb./sq. ft.
Answered by: CommunityAnswer
Date published: 2016-03-25

How do the doors latch or lock since they are sliding doors?

Asked by: suzieq
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Customer Reviews

8 ft. x 12 ft. Aluminum Finish Greenhouse is rated 5.0 out of 5 by 1.
Rated 5 out of 5 by from Top Notch Product & Customer Service First of all, let us say what a great greenhouse this is. And, just as important as the quality of the Monticello Greenhouse is their exceptional customer service. We bought an 8x12 greenhouse in April 2012. When it arrived we discovered the doors had been damaged in shipping. We reported this to Riverstone Mfg and a few days later, we had new doors. We did experience some alignment problems during assembly. Riverstone’s engineer contacted us and through his help discovered that 3 twin-wall panels (corners slightly crushed during shipping) were the cause of this problem. Riverstone immediately sent out replacement panels and a few days later we were back in business. The greenhouse then went together smoothly. We were and are still very impressed with their Customer Service. The greenhouse is easy to assemble and instructions are some of the best we have run across. We don’t think the greenhouse can be assembled in 4-5 hrs as seen on YouTube, but with two people can easily be assembled in one day. The completed greenhouse is rock solid – no rattling of the twin wall panels & all the metal parts are of heavy-duty construction. While the interior shade cloth is an accessory, it is well worth the money and is a great & convenient addition. We decided to buy this greenhouse after a great deal of research & were impressed by the answers to our questions we received from Riverstone. We have not been disappointed. While there are cheaper greenhouses on the market, from what we have seen, heard, and read from reviews; none of them match Riverstone’s quality and ease of assembly. As a side note we do not write reviews, but felt this product was worth our time. We are budget-minded shoppers and don’t part with our money easily. As the old saying goes, “You get what you pay for”, we felt it was worth it, and as a plus is made in the USA.
Date published: 2012-06-22
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