19'8" × 8'8" · 170 sq ft
20' Glasshouse
4.3 · 6 reviewsOur best-selling size. Room to run a full four-season vegetable rotation and still have space for starts and cuttings.
- • 10-year frame warranty
- • Bolted 1mm galvanized steel — no welded joints
- • Best for: Growing families & season-extension
- • Shipped across Canada
Measurements & materials
Exact specs for the 20' Glasshouse
- Length
- 19'8" (6m)
- Width
- 8'8" (2.64m)
- Ridge height
- 7'11" (2.42m)
- Side wall height
- 4'11" (1.5m)
- Roof slope (each panel)
- 5'3" (1.61m) — the diagonal from eave to ridge, derived from the width and rise
- Footprint area
- 170 sq ft (15.8 m²)
- Frame material
- 1mm galvanized steel, 275g/m² zinc coating (both sides)
- Frame profile
- 60mm omega-profile, fully bolted — zero welded joints
- Covering material
- Twin-wall channeled polycarbonate, CE-certified, UV-stabilized
- Covering thickness
- 4mm or 6mm
- Snow & wind load
- Engineered to the same structural spec sold into harsh Baltic and Northern European winters — bolted omega-profile hoops and diagonal cross-bracing are what carry snow load, not the polycarbonate. We don't publish a lab-tested kg/m² rating; if your site sees exceptional snow accumulation, clear the roof after major storms the same as you would a shed.
- Foundation
- No concrete footing required — ground anchor feet with cross-bracing hold the frame against wind uplift. A level gravel or paver base is recommended for long-term stability.
- Estimated planting capacity
- 45–55 tomato-sized plants — assumes typical tomato/pepper spacing; more if growing smaller crops like greens or herbs.
- Warranty
- 10-year frame warranty
What's included
- • Reinforced double doors on both gable ends, aluminum handles + locks
- • 2 roof vents for passive ventilation
- • 10cm foundation base rail
- • Ground anchor feet with crossbars
- • Numbered assembly instructions
- • Complimentary folding shelf
Built to last
Why the frame doesn't rust, sag, or fail at the joints
Most of what separates a greenhouse that lasts fifteen years from one that fails in three comes down to four decisions the manufacturer made before it ever shipped.
Omega-profile steel, not tube
Most budget kits use round or square tube. Ours uses a 60mm omega (Ω) profile — wider than most kits on the market — which resists twisting under snow load far better than tube of the same gauge.
Zero welded joints
Every connection is bolted, not welded. Welding burns through the zinc coating and creates a rust starting point at every joint — the first place a cheap frame fails. Bolted joints keep the galvanization intact everywhere, including at the connections.
275g/m² galvanization, both sides
The steel is hot-dip galvanized to 275 grams per square meter on both faces before it's ever formed into a profile — this is what actually determines how long a steel frame lasts outdoors, not the paint on top.
1mm gauge throughout
A full 1mm of steel in every structural member, not just the main hoops. Thinner gauge is the most common place cheaper kits cut cost, and it's invisible until the first heavy snow load.
Airflow, access, and what holds it to the ground
Doors — 2 — one at each gable end
Wide, tall, double-panel doors with aluminum handles and a locking mechanism. Each door opens halfway for everyday access or fully for wheelbarrow and equipment clearance, and doubles as a through-draft vent on hot days.
Ventilation — 2 roof vents
Positioned at the ridge, opposite the rising heat from the growing bed below. Paired with both end doors open, they create a chimney effect that pulls hot, humid air out without a fan — the single biggest factor in preventing fungal disease in a closed structure.
Foundation & anchoring
10cm foundation base rail, included with every kit. Sits between the ground and the polycarbonate, so the panels never sit directly in mud, standing water, or lawn chemicals.
Ground anchor feet with cross-bracing. Driven into the soil at each upright and cross-braced for wind resistance. No concrete required — a level gravel or paver pad is recommended but optional.
Because nothing is welded or set in concrete, the entire structure can be unbolted and relocated if you move or want to reposition it for better sun exposure.
Assembly
How it goes up
A weekend, with two people and a cordless drill — no welding, no cutting polycarbonate on site.
- 01
Lay out the base rail
Square the 10cm foundation rail to your footprint and stake the corners.
- 02
Raise the hoops
Bolt the pre-formed omega-profile hoops to the base rail at marked, numbered points.
- 03
Tie in the ridge and cross-bracing
Connect the ridge beam and diagonal braces — this is what gives the frame its snow and wind rigidity.
- 04
Hang the doors and fit the vents
Both gable-end doors and the two roof vents install last, after the frame is square and true.
- 05
Panel the polycarbonate
Pre-cut panels drop into the channel and are capped — no cutting or trimming on site.
Grow into it
Accessories to round out the setup — coming to the store soon. For now, ask us about availability when you order.
Raised garden beds
Slot-in cedar-style beds sized to the interior width, for keeping soil off the base rail.
Interior shelving units
Modular wire shelving that bolts straight to the frame — no extra hardware to source.
Plant support / trellis kits
Vertical netting and stake supports for tomatoes, cucumbers, and climbing beans.
Drip watering systems
Gravity-fed irrigation lines that run the length of the bed, on a timer.
Automatic vent openers
Wax-cylinder openers that push the roof vents open as the interior heats up — no wiring needed.
Pathway border strips
Keep gravel or mulch paths defined and separate from planting beds.
Questions about the 20' Glasshouse
Will the 20' Glasshouse fit my yard?+
The 20' Glasshouse has a footprint of 19'8" by 8'8" (170 sq ft). We recommend leaving at least 60cm of clearance on all sides for door swing and maintenance access.
How long does assembly take?+
Most customers assemble this size in a single weekend with two people. Every component is bolted, pre-cut, and numbered — no welding, no cutting polycarbonate on site.
Does it come with a foundation?+
Yes — a 10cm foundation base rail and ground anchor feet with crossbars are included. A level gravel or paver pad is recommended but not required.
What's the warranty?+
The frame is covered by a 10-year manufacturer warranty. The polycarbonate is CE-certified and UV-stabilized.
Can it handle Canadian winters?+
The frame is 1mm galvanized steel with a 60mm bolted omega-profile, engineered for heavy snow and wind loads. It's the same core structure sold into harsh European winters before we brought it to Canada.
Growers with the 20' Glasshouse
Tomatoes in March, in Ontario
“Okay so my husband thought I was nuts spending this much on a "hobby" but two seasons in and I am not exaggerating when I say I had tomato starts going by mid March. We got that huge February dump of snow and I kept going out there convinced it was going to cave in and it just... didn't. Frame hasn't moved an inch. Worth every penny, tell your husband I said so.”
Marianne T.
Ontario · Vegetable growing
Vents actually work
“The roof vents make a real difference on hot days, we barely need a fan. Instructions were translated fine, not perfect but fine. Herbs all winter now, my mother is jealous.”
Chantal B.
Quebec · Herbs & season extension
solid but read the manual twice
“we get brutal wind out here so i reinforced the anchor points more than the manual called for just to be safe, hasnt budged since. wish there was an assembly video, the printed guide alone took me a couple tries to get right on a few steps. product itself no complaints”
Tom W.
Saskatchewan · Prairie wind conditions
My neighbours keep asking about it
“So we'd been talking about getting a greenhouse for probably three years before actually pulling the trigger, kept putting it off because of the cost and honestly a little bit of laziness on our part. Finally did it last spring. We're getting produce well into November now which just wasn't happening before, the foundation base included with the kit made leveling so much less of a headache than I was bracing myself for, and now I've had two different neighbours ask where we got it. Would 100% recommend, just don't wait three years like we did.”
Sandra L.
New Brunswick · Season extension
Cracked panel, but handled well
“Not going to pretend everything was perfect out of the box - one roof panel had a hairline crack when it arrived. Emailed them with the order number and a photo of the crack, and the replacement panel showed up before I'd even finished putting together the rest of the frame. Honestly better support experience than I've had with much bigger companies. Bumping this up to 5 stars because of how it was handled, would've been 3 otherwise.”
Josée P.
Quebec · Vegetable growing
Disappointed with delivery, product is okay
“I want to be fair here - the greenhouse itself once assembled is decent. But my order shipped to the wrong regional depot and I spent almost three weeks on the phone/email sorting it out before it actually got to my house. By the time it arrived I'd basically lost the beginning of my planting season. If you're not in a hurry it's probably fine, but the logistics side needs work. Might update this if a future order goes smoother.”
carol.ann
Nova Scotia · Coastal wind