Gradwell Group Building Products
Mythos 6' x 4' Greenhouse - Grey Aluminium Frame & Twinwall Polycarbonate Panels
The Mythos wall and roof panels are made of a nearly unbreakable polymer called polycarbonate that has the light transmission benefits of glass but is lighter, stronger, and safer. The double walls diffuse intense sunlight that can stress plants, inhibit growth, and provide twice the heat retention of single panels for a stable environment.
The Mythos frame is made of rust-resistant aluminium mounted on a heavy-duty galvanized steel base for ultra-durable structural support. Other features include an integrated rain gutter to disperse the rainwater, a roof vent, and a lockable hinged door with a magnetic catch to help control temperature and humidity. The unique sliding panel system creates better insulation, stronger resistance to wind, and makes it easier to assemble than other DIY Greenhouses.
With this backyard greenhouse, you can prolong your growing season by starting in the early spring and extending your plant growth beyond the first fall frost. With its easy assembly, durable materials, and effective features, the Mythos greenhouse is a natural choice.
- Highly resistant, transparent, and safe polycarbonate greenhouse
- Built with light-diffusing twin-wall glazing for soft light irradiance and level temperatures
- Provides up to 100% protection from harmful sun rays (UV)
- Life-time resilient polycarbonate plastic walls; do not fracture, turn yellow or opacify over time
- Stout, rust-free aluminium structure
- Clean-lined and functional design
- DIY greenhouse, maintenance-free – built to last thanks to outstandingly durable materials
- Protects your plants from the elements so that you can enjoy an extended growing period.
- Technical information, including dimensions, panel thickness, and wind and snow load, can be found in the photo gallery above.
About this product
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About Gradwell Group Building Products
At Gradwell Group Building Products, we’re proud to be one of the UK’s trusted suppliers of high-quality outdoor living and construction solutions. With over 20 years of experience, we offer a carefully curated range of products—designed to combine long-lasting performance with stylish design.
Whether you’re looking for reliable shelter, low-maintenance roofline systems, or modern garden structures, we have a solution to suit every project. Our expert team provides honest advice, fast UK-wide delivery, and friendly customer support from start to finish.
Join thousands of homeowners, tradespeople, and developers across the UK who choose Gradwell Group for dependable products at competitive prices. Explore our full range today and experience quality you can count on.
Why Choose Gradwell Group Building Products?
✅ Trusted UK supplier with 20+ years of industry experience
✅ High-performance products built for British weather
✅ Wide range of styles, sizes, and custom options
✅ Nationwide delivery with installation support available
✅ Excellent customer service from our friendly, expert team
Frequently Asked Questions
1. Do your products come with a warranty?
Yes, all Gradwell Group products come with a manufacturer’s warranty for your peace of mind. Warranty periods vary depending on the product type, but most of our aluminium and GRP ranges offer 10–25 years of coverage against structural defects, corrosion, or weathering.
2. Can you deliver anywhere in the UK?
Absolutely. We offer UK-wide delivery on all products, including large or heavy items such as carports, patio covers, and conservatories. Delivery times may vary based on location and product availability, but we’ll always keep you updated every step of the way.
3. Do I need planning permission for your products?
In most cases, our products do not require planning permission—especially for carports, door canopies, patio covers, and roofline items. However, we always recommend checking with your local planning authority for large installations or if you live in a conservation area or listed building. Our team can provide specifications to assist with your application if needed.
4. Can I install the product myself or do I need a professional?
For larger structures like aluminium carports or lean-to conservatories, we recommend using a qualified installer for best results. We can also arrange professional installation services through our trusted partners.
5. How do I choose the right size or style for my property?
Our team is here to help! If you’re unsure which product suits your space, simply get in touch with us. We can guide you through measurements, fitting options, and customisation features to ensure you get the perfect fit—whether it’s for your garden, driveway, or roofline.