Investing in a greenhouse isn’t just about this season, it's about the long game. Whether you’re nurturing veg, flowers or seedlings, you want something built to last. So, how long does a polycarbonate greenhouse really last?
The answer depends on the materials, build quality, and a bit of care. But here’s the good news: a well-made polycarbonate greenhouse from Gradwell Group Building Products can serve you for well over a decade and then some.
What’s the Typical Lifespan?
Most polycarbonate greenhouses last between 10 to 15 years, sometimes even longer.
Here’s why:
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Twin-wall polycarbonate resists damage, holds heat well and doesn’t shatter like glass
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Aluminium frames don’t rust, warp or rot
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Modern UV protection helps prevent panels turning yellow or brittle over time
With light maintenance, you can expect many happy growing seasons ahead.
What Affects a Greenhouse’s Lifespan?
1. Panel Quality
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Look for twin-wall polycarbonate (not single-sheet plastic)
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At least 4mm thick, ideally UV-stabilised
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UV protection helps panels stay clear and strong for over a decade
2. Frame Material
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Aluminium is lightweight, rustproof, and won’t need repainting
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Avoid cheaper plastic or untreated timber frames they don’t last as long
3. Location Matters
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Avoid very exposed or windy areas
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Place your greenhouse where it gets good light but is protected by fences or hedges
4. Maintenance
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Just a quick clean with soapy water twice a year
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Keep vents, gutters and seals clear of leaves and grime
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Tighten bolts annually to keep it sturdy
Built for British Weather
Here in the UK, gardens face the full range sunshine, storms, frost, and rain. That’s why polycarbonate beats glass for longevity:
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Impact-resistant no shattered panels from hail or footballs
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Insulated traps warmth for better year-round growing
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Flexible bends slightly in wind, making it less likely to break
According to Clear Amber Shop, twin-wall polycarbonate can last 15+ years, especially when UV-treated.
Studies from MDPI also show polycarbonate provides better thermal performance than standard glass greenhouses.
Why Choose Gradwell Group Building Products?
At Gradwell Group, our greenhouses are designed to last.
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Twin-wall polycarbonate panels with UV protection
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Durable aluminium frames that don’t rust or weaken
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Simple DIY assembly with full instructions
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Strong base kits for long-term stability
Whether you want a compact 6x4ft for your patio or a walk-in model for your allotment, we’ve got options that balance affordability and durability.
Browse our full range of polycarbonate greenhouses
Tips to Make Your Greenhouse Last Longer
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Wash twice a year with warm, soapy water
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Tighten bolts and check for loose fixings
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Clear leaves and moss from vents and gutters
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Install away from large trees or overhanging branches
These quick checks take minutes but add years to your structure.
FAQs
1. Can polycarbonate greenhouses last over 15 years?
Yes! With quality materials and light care, they can last 15–20 years.
2. Do polycarbonate panels go yellow?
Not if they’re UV protected. Our panels are UV-stabilised to stay clear.
3. Is aluminium better than wood for frames?
Yes. Aluminium is rustproof, rot-free and maintenance-free.
4. What’s the biggest threat to greenhouse lifespan?
Poor location and no maintenance. Keep it clean and stable, and it’ll thrive.
5. Can I replace individual panels?
Absolutely just get in touch, and we’ll match your model.
Final Thoughts
Your polycarbonate greenhouse is an investment in years of growing success not just a season or two. And with Gradwell Group, you’re getting long-lasting materials, expert guidance and models designed for British gardens. Find your forever greenhouse here. Need help choosing the right size or style? Get in touch with our team