Polycarbonate Greenhouses Guide
Polycarbonate greenhouses offer a safer, more practical alternative to traditional glass structures. With shatterproof glazing that’s 200 times stronger than glass, these modern greenhouses protect your plants while keeping children and pets safe from broken glass hazards.
About Our Polycarbonate Greenhouses
Our polycarbonate greenhouse collection features over 100 models from Britain’s most trusted manufacturers. You’ll find everything from compact 6x8 starter greenhouses to spacious 10x12 growing spaces, all constructed with virtually unbreakable twin-wall or clear polycarbonate glazing.
Palram Canopia
The Palram Canopia Hybrid Greenhouses combine 4mm twin-wall polycarbonate roof panels with crystal-clear single polycarbonate side walls, giving you 90% light transmission with enhanced roof insulation. Their rust-proof aluminium frames come in silver, green, or grey powder-coated finishes and include a locking hinged door with magnetic catch. Every Palram greenhouse includes a 5-year manufacturer warranty.
Elite Greenhouses
For serious growers who need maximum insulation, Elite Greenhouses feature premium 6mm twin-wall polycarbonate throughout. This thicker glazing provides 40% better heat retention than 4mm panels, keeping your greenhouse 5°C warmer on cold nights. Elite’s low-threshold sliding doors and built-in guttering system make them perfect for wheelchair users.
Vitavia Greenhouses
Vitavia Greenhouses offer excellent value with 3mm twin-wall polycarbonate and silver anodised or powder-coated aluminium frames. Their sliding door design and integrated roof vents provide easy access and ventilation, while the 12-year warranty gives you long-term peace of mind.
Choosing Polycarbonate Greenhouses: Quick Guide
- Twin-Wall vs Clear Polycarbonate: Twin-wall panels have a honeycomb structure that traps air for insulation, keeping your greenhouse 3–5°C warmer than single-layer glazing. Clear polycarbonate offers glass-like transparency with shatterproof safety — ideal if you prioritise maximum light for seedlings and summer crops.
- Size Selection: The most popular size is 6x8, which fits 4–6 staging benches. For serious vegetable growing, 8x6 or 8x10 greenhouses offer proper working space without overwhelming smaller gardens. Compact 4x6 models are perfect for patios.
- Wind Resistance: Modern polycarbonate greenhouses handle British weather well. When anchored to a concrete or slab base (how to build a concrete base or paving slab base guide), they withstand winds up to 56mph.
- Premium Options: The Palram Canopia Orangery and Ledro Garden Room bring contemporary design to polycarbonate construction, with taller walls and stylish profiles that work as garden extensions.
Frequently Asked Questions
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How much do polycarbonate greenhouses cost?
Entry-level polycarbonate greenhouses start from £350–£500 for compact 4x6 models. Most gardeners opt for 6x8 models (£500–£850), while premium 8x10 designs with 6mm glazing and powder-coated frames cost £900–£1,500.
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Do polycarbonate greenhouses turn yellow and how long do they last?
Modern polycarbonate panels have UV-protective coatings that prevent yellowing for 10–15 years. Leading brands such as Palram Canopia, Elite, and Vitavia use UV-stabilised polycarbonate that maintains clarity throughout the warranty period.
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Which is better: twin-wall or clear polycarbonate panels?
Twin-wall polycarbonate provides superior insulation (R-value ~1.7) versus single-layer clear panels (~0.9). Twin-wall is ideal for year-round growing, while clear panels deliver 90% light transmission and traditional glass aesthetics.
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Are polycarbonate greenhouses strong enough for windy gardens?
Yes. Polycarbonate panels are 200 times more impact-resistant than glass and flex instead of shattering in strong winds. When properly anchored, they can withstand sustained winds up to 56mph.
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How much warmer is a polycarbonate greenhouse than outside?
A well-sealed twin-wall polycarbonate greenhouse maintains temperatures 5–8°C warmer than outdoors on sunny days without heating and retains heat more effectively overnight.
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What maintenance do polycarbonate greenhouses need?
Clean annually with warm, soapy water and a soft cloth. Avoid abrasive cleaners or rough sponges that can scratch the UV-protective surface.