Large Greenhouses

 click here to download our large greenhouse brochure! (please see pricing below)

We have a variety of widths and lengths of greenhouse structures from which to choose. If you’re just trying to get a head start on the garden vegetable season (and maybe extending the growing season by a couple of weeks) consider our free-standing structures which use just one layer of poly. If your intent is to grow all year round and heat the greenhouse then you should be looking at our greenhouse packages that offer a double poly roof, inflator fan kit and roll-up sidewalls for better heat efficiency.


A COLD FRAME usually has a single plastic covered structure and 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 for better heat efficiency.


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

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 click to download our large greenhouse brochure! See pricing chart below, click to expand and print

Replacement Double Layer Plastic for the Roof, 7-8 years
(sample examples, please call for your specific size)
30’x72′ Regular Profile $936
27’x72′ Regular Profile $780
24’x72′ Regular Profile $702
20’x72′ Regular Profile $624

**Please use these prices as a guide only (current as of August 2018)
& call for your custom quote, prices subject to change without notice**
Our prices exclude installation, foundation, end framing, freight & taxes unless otherwise specified. Please inquire with any concerns.

Covering Details

  • Cold Frames are typically covered with a single layer poly and have a 5-6 year expected lifespan.
  • Greenhouses are typically covered with a double layer poly and have a 7-8 year expected lifespan.
  • 6mil clear greenhouse plastic comes with a 4 year warranty against deterioration by the sun.
  • White plastic should not be used for plants
  • Packages with double cover include an inflator fan. This kit includes hanger bracket with adaptor to fasten to the inside layer of the cover
  • Double layer poly with air between reduces heat loss by 30% and minimizes condensation. It is very effective for stiffening buildings in severely windy areas
  • All packages include one layer of plastic for both ends

Structure Components & Details

  • Base Brackets with 2 lag bolts each to attach to beam, curb, wall, etc (anchoring devices not included)
  • Welded continuous ridge with U channel stubs at the prescribed hoop spacing according to local wind & snow load requirements
  • Spacers between the hoops (2 per side on the larger buildings, 1 per side on the smaller buildings)
  • Diagonal wind braces in each corner
  • Wirelock to fasten the cover is composed of an aluminum channel with stainless steel spring inserts. It is included for both sets of end hoops. Sidewall wirelock is an optional extra.

Roll up Sides

  • No electricity needed with simple hand crank & stop
  • Variable height possibilities according to wind area
  • Roll up sides work best in combination with end vents located near the peak
  • Unique locking strip that is guaranteed not to slip or become out of alignment

Anchoring Options

  • Choice between Base Bracket (included in pricing seen in brochure) or Anchor Posts for anchoring
  • Anchor posts are an optional extra. These hollow steel tubes are 1 ¼ “ x 36” or 1 ¾ x 40”. There is one anchor post per hoop, usually set into concrete
  • Anchor posts are not advisable for very heavy or stony ground because of shifting
  • Anchoring the foundation is critical to the long term life of the building


2 responses to “Large Greenhouses

  1. Landis Fruit Market

    Hello. We are a small outdoor flower and produce market in Bancroft Ont. We are looking for a 30′ by 60′ foot cold frame. We open our market mid May and close in mid November. The early part of our season we sell hanging baskets and bedding plants that we buy in. Could you give me a price on hardware for a 30′ wide as well as a 27′ width (60′ length)? We would like the roll up side option. We also get a lot of snow and would need enough support for that. I would be able to pick up the package. I have a full size highway truck and trailer. Thanks. Nelson Rohrer cell# 519 357 5731

  2. Thanks for your inquiry. Your request has been forwarded to Norm and you can expect him to contact you within 24hrs. Thanks!