Is a Polycarbonate Greenhouse Better than Glass?

When it comes to choosing the perfect greenhouse, one question stands tall:
Should you go for polycarbonate or traditional glass?

While glass has been the long-standing classic, polycarbonate greenhouses are fast becoming the go-to choice for modern gardeners and for good reason. They’re lighter, safer, and offer better insulation, especially when battling the unpredictable British climate.

Let’s dig into the pros, cons and facts so you can choose the right structure for your space, your plants, and your peace of mind.

Polycarbonate vs Glass: What's the Difference?

Both materials do the job but how they do it varies greatly. Here’s a quick side-by-side comparison:

Why is Polycarbonate Often the Better Choice?

1. It’s Safer in Every Way

If you’ve got pets, kids, or a clumsy elbow or two, polycarbonate is a lifesaver. Unlike glass, it won’t shatter making it perfect for family gardens.

Did you know polycarbonate is up to 200 times more impact-resistant than glass? That’s serious peace of mind.

2. Insulation That Works with British Weather

British gardens need a greenhouse that traps heat—not one that leaks it.

Twin-wall polycarbonate acts like double glazing. It keeps the warmth in and the cold out, which helps:

• Cut heating costs
  
  

• Protect delicate seedlings
  
  

• Extend your growing season
  
  

According to Clear Amber Shop, polycarbonate panels provide around 40% better insulation than single-pane glass. That means healthier plants and happier growers.

3. It’s Lighter and Easier to Fit

Forget heavy lifting. Polycarbonate panels are lightweight and easy to manoeuvre, making self-assembly totally doable even for beginners.

This is why we’ve designed every Gradwell Group greenhouse to be DIY-friendly with clear, step-by-step instructions.

See our full range of easy-to-install polycarbonate greenhouses

4. Built for Long-Term Use

Modern polycarbonate panels are UV-coated, meaning they won’t yellow, fade or crack over time.

With proper care (a quick clean every few months and checking for loose fittings), your greenhouse could last 10–15 years or more.

Bonus? If a panel ever gets damaged, it’s far cheaper and easier to replace than glass.

When Might You Prefer Glass?

Let’s be honest glass greenhouses do have their charm.

You might choose glass if:

• You’re restoring a heritage garden or period property
  
  

• You want that crystal-clear aesthetic
  
  

• You don’t mind a bit more upkeep for the look you love
  
  

But for most gardeners who value practicality, affordability, and longevity, polycarbonate is the smarter pick.

Why Choose Gradwell Group for Polycarbonate Greenhouses?

At Gradwell Group, we’ve taken the best of polycarbonate tech and made it accessible to every kind of gardener:

• UV-protected twin-wall polycarbonate panels
  
  

• Sturdy aluminium frames (rust-free and weather-resistant)
  
  

• Sizes to suit patios, gardens, and allotments
  
  

• Affordable pricing without cutting corners
  
  

You’re growing tomatoes in summer or protecting sprouts through winter, we’ve got the greenhouse for you.

Explore our polycarbonate greenhouse collection
Need help choosing? Contact our friendly team

FAQs 

1. Is polycarbonate warmer than glass?

Yes. Twin-wall polycarbonate keeps heat in and creates a more stable climate.

2. Is polycarbonate safer than glass?

Absolutely. It’s shatterproof and won’t crack into sharp pieces like glass.

3. Does polycarbonate block too much light?

It diffuses light evenly, which reduces hotspots and sunburn on your plants.

4. Is polycarbonate cheaper than glass?

Yes. It’s not only more affordable upfront, but easier (and cheaper) to replace if needed.

5. How long does polycarbonate last?

With care, expect 10–15 years, especially if UV-coated.

Final Thoughts

So, is a polycarbonate greenhouse better than glass?
For most modern gardens, yes.

It’s safer, warmer, easier to build, and more affordable in the long run. Unless you're restoring a historic space or want that classic Victorian look, polycarbonate delivers top performance without the faff. At Gradwell Group, we help UK gardeners grow smarter with greenhouses designed for real life, real gardens, and real weather.

Find your perfect polycarbonate greenhouse today