The Professional's Choice: The Janssens Gigant Range
The Janssens Professional Gigant range is the ultimate solution for large-scale growers, commercial enterprises, and serious gardeners. Built in Belgium, these are among the largest and most robust greenhouses we offer. They feature heavy-duty box-section aluminium frames, 4mm toughened safety glass, and exceptional 2m+ high eaves.
With imposing square footprints starting at 15ft, 17ft, and 19ft, the Gigant is designed for professional cultivation, educational institutions, and ambitious home growing projects. Every Gigant includes integrated guttering with 40mm downpipes, multiple roof vents, double-hinged doors, and a comprehensive 13-year warranty covering the framework.
Choosing Your Janssens Professional Gigant Greenhouse
The Gigant is an investment in scale, available in 15ft, 17ft, and 19ft square footprints. This range offers two distinct styles: the clean-lined “Hobby” model and the classic “Victorian” model, which features decorative roof cresting.
The 15x15 models are a popular starting point, offering a vast space for multiple staging runs. The 17x17 and 19x19 models provide a truly professional-grade workspace suitable for nursery work, large kitchen gardens, or educational use. Pricing starts from around £11,950 for the 15x15 Hobby model.
The 4mm toughened glass specification delivers superior light and safety, while the box-section frame provides unmatched strength against UK gales. You can complement your Gigant with greenhouse accessories selected from our compatible range, or explore our full Janssens greenhouses collection. For truly unique requirements, our bespoke designed greenhouses service offers custom dimensions.
Key Features That Matter
- Superior Strength Engineering: Box-section aluminium framework handles UK wind loads up to 28mph sustained speeds, while the 4mm toughened safety glass exceeds BS6206 Class A standards for impact resistance.
- Professional Growing Space: 2m eaves height allows tall crop growth and reduces humidity-related disease pressure by around 30% compared to standard 5ft eave designs.
- Integrated Water Management: Built-in guttering and 40mm downpipes efficiently collect rainwater for irrigation systems or storage tanks.
- Practical Ventilation: Multiple roof vents and a louvre vent provide commercial-grade airflow control and passive cooling.
Who Should Choose a Janssens Gigant?
- Educational Institutions: Ideal for schools and colleges, with robust glass and low maintenance.
- Small-Scale Commercial Growers: Provides nursery-level quality and modular expandability.
- Serious Home Gardeners: Perfect for year-round produce, exotic varieties, and high-performance growing.
Frequently Asked Questions about Janssens Professional Gigant Greenhouses
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What makes the Janssens Gigant different from standard greenhouses?
The Gigant uses box-section aluminium framing 40% stronger than hobby-grade greenhouses, with 4mm toughened safety glass and 2m eaves for professional durability and workspace.
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How much does a Janssens Professional Gigant greenhouse cost?
Prices start from around £11,950 for the 14x14 Hobby model, including free UK delivery and a 13-year frame warranty. Professional installation is optional.
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What base preparation does the Gigant require?
A level concrete or paving base extending 150mm beyond the footprint is required. The base plinth distributes weight evenly—see our base preparation guide for full instructions.
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Can I extend my Gigant greenhouse later?
Yes, extension kits can be added later, allowing modular expansion without compromising structure or warranty.
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Does the Gigant need planning permission?
Usually not, but structures over 30m² or close to property boundaries may need permission—check with your local authority.
Compare Your Options
Browse our complete large greenhouses collection to compare models. For expert guidance, see our greenhouse growing guide or call 0800 098 8877 for personalised advice. Every Gigant includes free UK delivery and expert support.