8FT x 4FT Extension for Monticello Black Greenhouse


The Monticello 4 foot extension kit is specifically designed for the Monticello line of greenhouses.'  ' 

The idea is simple, as your gardening greenhouse needs grow so can you greenhouse.'  The 4 ft extension kit allows for the expansion of your greenhouse.'  The Monticello is proudly made in the USA from start to finish.'  Each 4ft extension kit comes includes a 2ft x 2ft roof vent with automatic opener and gutters.'  When ordering your extension kit make sure that the color matches your existing greenhouse.' 

This one is designed specifically for Black frames and will work with the following greenhouses:'  MONT-8-BK - MONT-12-BK - MONT-16-BK - MONT-20-BK - MONT-24-BK.


  • 49"W x 101"L x 90"H
  • Quick assembly construction.' 
  • Integrated flush base design.'  High impact UV stable 8mm twin wall polycarbonate walls and roof.'  Heavy duty extruded aluminum frame construction.'  Black electrostatically painted frame.' 
  • 1 - 2ft x 2ft roof vent with automatic openers.'  Integrated dual rain water gutter system.' 
  • Full 10 yr warranty (strongest in the industry); Proudly designed and made in the USA!' 
  • Allow for a FULL weekend to Fully Assemble. Two people suggested for assembly.'  ' Manual is fully illustrated.

What's included?

  • All Aluminum framework, all PC panels, hardware, instruction manual, screw driver and wrench

What's not included?

  • Greenhouse
  • Plants

Care instructions

  • Soapy water

Power Supply

  • none

Assembly required

  • Yes

Other Dimensions

Product Length (in): 49

Product height' (in): 90

Product width (in): 101

Product weight (lb): 67


10 years limited warranty

Ships in # of boxes

  • 1

Quantity per box

  • 1

Price Guarantee

We work very hard to ensure that we offer the absolute best prices online.  If you find another online store that offers a lower price than us within six months of your purchase date please let us know and we will refund your original payment for the difference.  We want you to feel confident that you are getting the absolute best price for the product you are ordering.  If you find that our own website has a lower price for the same item you have ordered within six months of your purchase date will refund the difference as well.

To request your partial refund simply e-mail us a link to the same product on our website, or on our competitors website within six months from the date of your order and we will process the credit accordingly.

Our 100% Price Guarantee has some limitations:

  • You must purchase the item from our website before requesting your Price Match Guarantee
  • Promotions such as rebates and buy one, get one free offers are not eligible
  • The item must be in stock on the competitors website
  • The competitor must be an online store, they may not have a retail location
  • The website can not be a discounter or auction website (ie; eBay, overstock, etc..)
  • The competitor must be an Authorized Retailer of the product in question
  • The Price Match Guarantee includes the item price and the shipping charges, it excludes sales tax
Order & Shipping

Order Confirmation:

As soon as you place your order, you will receive an order confirmation e-mail. This means that we have received your order in our system and pre-authorized your credit card for the purchase.  As soon as we receive your order, we automatically reach out to our suppliers to confirm that it is in stock and available for immediate shipment.  If your item is on backorder or unavailable, we will void the pre-authorization and reach out to you via e-mail.  If your item(s) are available for immediate shipment (within 5 business days), we will process the charges and submit the order for shipment.

Order Shipment:

If your order is stock and we process the charges to your credit card, it will ship within five business days from the date of your order.  We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address you provided when checking out.  If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at orders@theshedwarehouse.com

Some of our products require additional labor and/or equipment from the buyer when delivered. Our wood sheds/structures and some vinyl and metal sheds/structures are shipped using a flatbed truck which often is too large for a residential driveway. If a residential driveway or loading dock is unavailable, these products will need to be manually unloaded by the buyer at the curb face of the delivery address. We recommend a labor force of 2-3 people when the shipment arrives. Please allow a 2-3 hour window for delivery.


Please inspect the packaging of your item(s) when they arrive, if you notice any damage you should make note of it when signing for delivery.  If your item(s) do arrived damaged, please send photos to returns@theshedwarehouse.com and we will process an insurance claim on your behalf.

Cancellations & Refunds:

All orders cancelled after 48 hours are subject to a $20 administration fee, whether or not your order has shipped.  If you order has shipped, you (the buyer) will also be responsible for actual return shipping charges. Refunds will only be issued to the original credit card that you use when placing your order.