The Tough One XL — Toughest Greenhouse 13'1\" Wide Double Door Edition
The Tough One XL — Toughest Greenhouse 13'1\" Wide Double Door Edition
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🎁 3 FREE gifts included with every order:
Automatic Roof Vent Opener ($75 value) · Galvanized Raised Bed ($115 value) · 14-Piece Gardening Tool Set ($12 value)
📅 Pre-Order Pricing ends June 30 — prices increase after this date. Delivery Aug–Sep 2026 · Free US freight · Cancel within 7 days
❄️ STRUCTURAL RATINGS — CHOOSE YOUR BUILD
| Standard (39" apart) | Heavy Duty (26" apart) | |
|---|---|---|
| ❄️ Snow Load | 15 lbs/ft² | 30 lbs/ft² |
| 💨 Wind Rating | 72 mph | 85 mph |
Heavy Duty recommended for Zones 3–6 and coastal/high-wind sites.
Our widest polycarbonate greenhouse — 13'1" wide with double front doors.
More width. More access. More space to work. The Double Door Edition is the professional choice — built for gardeners who treat their greenhouse as a serious growing operation, not just a seasonal hobby. Double sliding doors at both ends mean wheelbarrows, garden carts, and larger equipment move in and out without contortion. Polish-engineered galvanized steel frame, twin-wall polycarbonate panels, free US shipping.
Width: 13'1" (4m) | Height: 7'6" (2.3m) | Doors: Double sliding doors — front and rear
They offer one spec. We offer your spec.
Most competitors sell one panel thickness at one price. We give you the choice: budget-smart 4mm, the same 6mm spec the market leaders use at a lower price, and Heavy Duty frame spacing no competitor offers.
Sizes and pricing
| Length | Frame Spacing | Panel | Price |
|---|---|---|---|
| 13ft (171 sq ft) | Standard (39") | 4mm | $2,400 |
| 13ft (171 sq ft) | Standard (39") | 6mm | $2,600 |
| 13ft (171 sq ft) | Heavy Duty (26") | 4mm | $2,800 |
| 13ft (171 sq ft) | Heavy Duty (26") | 6mm | $3,000 |
| 20ft (262 sq ft) | Standard (39") | 4mm | $2,900 |
| 20ft (262 sq ft) | Standard (39") | 6mm | $2,990 |
| 20ft (262 sq ft) | Heavy Duty (26") | 4mm | $3,190 |
| 20ft (262 sq ft) | Heavy Duty (26") | 6mm | $3,390 |
| 26ft (340 sq ft) | Standard (39") | 4mm | $3,190 |
| 26ft (340 sq ft) | Standard (39") | 6mm | $3,390 |
| 26ft (340 sq ft) | Heavy Duty (26") | 4mm | $3,590 |
| 26ft (340 sq ft) | Heavy Duty (26") | 6mm | $3,790 |
| 33ft (433 sq ft) | Standard (39") | 4mm | $3,690 |
| 33ft (433 sq ft) | Standard (39") | 6mm | $3,790 |
| 33ft (433 sq ft) | Heavy Duty (26") | 4mm | $4,090 |
| 33ft (433 sq ft) | Heavy Duty (26") | 6mm | $4,390 |
| 39ft (511 sq ft) | Standard (39") | 4mm | $3,990 |
| 39ft (511 sq ft) | Standard (39") | 6mm | $3,990 |
| 39ft (511 sq ft) | Heavy Duty (26") | 4mm | $4,290 |
| 39ft (511 sq ft) | Heavy Duty (26") | 6mm | $4,590 |
DOUBLE DOOR — WHO IS THIS FOR?
| Standard single-door Toughest | Double Door Edition |
|---|---|
| One front door — sufficient for hand tools and baskets | Double doors front and rear — wheelbarrows, carts, large equipment |
| 9'8" width — great growing space | 13'1" width — professional-scale growing operation |
| Perfect for home gardeners | Perfect for serious growers, market gardeners, homesteaders |
| Single ventilation path | Double door through-flow — superior summer ventilation |
FRAME SPACING — WHAT'S THE DIFFERENCE?
| Standard (39" apart) | Heavy Duty (26" apart) |
|---|---|
| Best for most US climates | Best for heavy snow regions — Minnesota, Vermont, Michigan, Montana |
| More open interior feel | Maximum structural reinforcement |
| Faster assembly | More crossbars = more anchor points for shelving and accessories |
| Recommended for zones 6–10 | Recommended for zones 3–6 with 3ft+ snowfall |
PANEL THICKNESS — 4MM VS 6MM
| 4mm Twin-Wall Polycarbonate | 6mm Twin-Wall Polycarbonate |
|---|---|
| Good insulation — extends season 4–6 weeks each end | 30% better insulation — extends season further |
| Light transmission: 82% | Light transmission: 80% |
| Best for mild to moderate climates | Best for cold climates and year-round growing |
| Lower price point | Longer lifespan in harsh conditions |
ASSEMBLY — WHAT TO EXPECT
Step 1 — Choose your size and order. Select length, frame spacing, and panel thickness. Free freight to your door in 12–16 business days.
Step 2 — Unbox and build. All components arrive pre-labeled. Full illustrated assembly manual included. The 13ft version typically takes a weekend with two people. Larger sizes allow two weeks. No specialist tools required.
Step 3 — Grow at scale. The 13'1" width gives you proper growing rows on both sides with a generous centre aisle. Space for raised beds, shelving, and a dedicated potting area.
FREQUENTLY ASKED QUESTIONS
What is the frame made from?
Hot-dip galvanized steel — permanent zinc bonding that protects against rust for 15+ years. Not painted, not coated — galvanized. The same process used in industrial outdoor infrastructure.
How much space does the double door give you?
Each door is a full-width sliding door — wide enough for a standard wheelbarrow or garden cart. The rear door creates a complete through-access path, making large harvests, soil deliveries, and equipment movement genuinely easy.
Can I heat it in winter?
Yes. At 13'1" wide, you'll want a slightly larger heater than the standard model — a 2,000–3,000W unit with thermostat handles most US winter climates comfortably. The twin-wall panels provide excellent insulation.
Is this suitable for market gardening?
Yes — the 13'1" width and double-door access make this the right choice for anyone selling produce at farmers markets or supplying restaurants. At 39ft length, you have 511 square feet of production space — serious output potential.
Can I anchor it to a concrete pad?
Yes — base frame includes anchor points for concrete, paving, or deck. Essential for this width in wind-prone areas.
TECHNICAL SPECIFICATIONS
| Spec | Detail |
|---|---|
| Width | 13'1" (4m) |
| Height | 7'6" (2.3m) |
| Frame material | Hot-dip galvanized steel |
| Panel options | 4mm or 6mm twin-wall polycarbonate, UV stabilized |
| Frame spacing options | Standard 39" / Heavy Duty 26" |
| Doors | 2 sliding doors — front and rear |
| Ventilation | Roof vents + full double-door cross-ventilation |
| Warranty | 10-year frame / 5-year panel |
| Delivery | Free freight, continental US |
Questions? Email shop@zengreenhouses.com — we answer every message personally.
Shipping & Delivery
Shipping & Delivery
Ships via freight on pallets — delivered to your driveway. Free shipping to all 48 continental US states. Estimated delivery Aug–Sep 2026. You'll receive a tracking number and a delivery appointment call 2–3 days in advance.
Warranty & Returns
Warranty & Returns
12-year structural frame warranty — the longest standard warranty in the US market. If the frame fails due to a manufacturing defect, we replace it. 5-year panel warranty on all polycarbonate and glass panels. Cancel within 7 days of ordering for a full refund, no questions asked.
Assembly
Assembly
Most customers complete assembly in one weekend with two people. No specialist tools required — all components are pre-drilled and labeled. Full illustrated assembly manual included. NY-area installation service available on request.
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