Backyard Greenhouse Information

12' Mini Greenhouse

This 12’W x 18’L High Profile Mini Greenhouse has a single layer of plastic for the roof and ends. It is used as a “season extender”.

To make it a year-round structure a second layer of plastic would be added to the roof, and an inflator fan kit would be supplied to blow air in between the layers.

This building sits on a 4” x 4” pressure-treated beam (there are other environmentally friendly alternatives available as well), which is anchored into the ground.

Ventilation can be done manually (through doors and windows or by adding roll-up sidewalls), or mechanically by adding an exhaust fan.


A COLD FRAME usually has a single plastic covered structure and is used as a season extender
A GREENHOUSE usually has a double plastic cover with air in between and sides that roll up for year-round use and better heat efficiency.

Be sure to review our article on building permits as well, and check out our “getting started” page for everything to consider for your purchase. We have plenty of information on our website and YouTube channel for you to review, as well as a book to have it printed all in one place if you prefer. Please feel free to have a look around and call or email us with any questions you may have. We are happy to help!


  • Custom widths, heights & hoop spacing
  • Roof vents & forced ventilation packages
  • Various types & sizes of doors with end framing are priced separately
  • 8mm polycarbonate sheeting for roof and/or ends
  • Roll up sides for natural ventilation & reduced condensation


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click here to download our backyard greenhouse brochure! Please see pricing below, click to expand and print

**Please use these prices as a guide only (current as of March 2022) & call for your custom quote, prices are subject to change without notice**
Our prices exclude installation, foundation, end framing, freight & taxes unless otherwise specified. Please inquire with any concerns.

please note that the code from the ad is for full backyard greenhouse structure kit purchases only, not to be combined with other sizes or partial structures or materials