Janssens Modern Pent Roof Greenhouses

About our janssens modern pent roof greenhouses

Janssens Modern Pent Roof Greenhouses bring Belgian engineering excellence to UK gardens with their distinctive single-slope design. Manufactured since 1946 in their 6,500sqm facility in Lier, Belgium, these premium structures combine box-section aluminium frames with 4mm toughened safety glass that’s six times stronger than standard glazing. The pent roof design creates exceptional headroom, well suited to taller plants and comfortable working space, while offering efficient water runoff through integrated gutters with 40mm aluminium downpipes.

You’ll find models ranging from the compact Janssens Modern 8x10 to the spacious Janssens Modern 10x20, with 2ft extension options available to grow with your needs. Every greenhouse includes two automatic roof vents, one hinged side vent, and double sliding doors as standard. Choose from silver, green, or black powder-coated frames to suit your garden aesthetic. Backed by a 13-year warranty and free UK delivery, these greenhouses represent serious investment in year-round growing space.

Key features of modern pent roof greenhouses

Premium construction standards

• Box-section aluminium frame with matching base plinth for structural stability
• 4mm toughened safety glass throughout, tested to TUV and GS safety standards
• Rubber glazing gaskets (not clips) for superior insulation and weatherproofing
• Stainless steel fixings that won’t rust or corrode over time

Practical growing space

• Single-slope pent roof design provides maximum headroom along one side
• Available in 8ft and 10ft widths with lengths from 10ft to 20ft
• Built-in gutter system with 40mm downpipes for rainwater collection
• Extendable in 2ft increments to accommodate expanding plant collections

Ventilation & customisation

• Two automatic roof vents regulate temperature without manual intervention
• One hinged side vent provides cross-ventilation for air circulation
• Double sliding doors (can be positioned on front, back, or sides)
• Frame colour options: Silver, green, or black powder-coated finish

Choosing your janssens modern pent roof greenhouse

Size selection depends on your available space and growing ambitions. The 8ft-wide models (8x10 through 8x20) work brilliantly for standard UK gardens, while the 10ft-wide range (10x10 through 10x20) suits dedicated growers who need commercial-grade space. The pent roof provides full standing height, typically 7ft or more, making it ideal for walls, fences, or alongside buildings.

Frame colour impacts both aesthetics and longevity. The powder-coated green and black finishes blend with UK gardens and include a protective coating that extends frame life. Silver aluminium offers a contemporary look and natural corrosion resistance. All options include the same solid construction quality. Prices start from £7,399 for the 8x10 model, rising to £10,799 for larger configurations.

Browse our Janssens Greenhouses or explore Modern Greenhouses for more styles. Our greenhouse installation service ensures professional setup on a level base.

Frequently asked questions about janssens modern pent roof greenhouses

• What makes the pent roof design different from traditional greenhouses?

  The pent roof has a single slope instead of a peak, creating maximum headroom along one side while maintaining a sleek, lower profile. It provides efficient water runoff and reduced wind resistance, ideal for modern gardens and wall placement.

• How much do Janssens Modern Pent Roof Greenhouses cost?

  Prices range from £7,399 for the 8x10 model to £10,799 for the 10x20. Mid-range 8x14 models typically cost £8,500–£9,000.

• What base do I need for a Janssens Modern greenhouse?

  A firm, level base, concrete, slabs, or decking, is required. It must be level within 5mm across the footprint for proper door alignment and structure.

• Can I extend my greenhouse later?

  Yes. Janssens Modern Pent Roof Greenhouses can be extended in 2ft increments. Extensions are available via authorised retailers for smooth integration and warranty coverage.

• Are these greenhouses suitable for year-round growing?

  With 4mm toughened glass and rubber gaskets, these greenhouses retain warmth for three-season growing. For winter use, add heating or insulation accessories.

Ready to create your growing space? Explore the full range of Janssens Modern Pent Roof Greenhouses or call 0800 098 8877 for advice.