Best Greenhouses & Cold Frames — Plastic + Balcony/patio (2026)
3 greenhouses & cold frames matching material “Plastic” + best for “Balcony/patio”, hand-picked from UK Amazon listings.
Not sure which one to pick? Read our Best Greenhouse UK (2026) guide.
£19.99
Pros
- Reinforced weatherproof PVC cover
- Roll-up zip door for easy access
- Tool-free assembly, ideal for patios
Cons
- Less sturdy than a full-size greenhouse
- Cover needs replacing after a few seasons
#2 Pick
Oypla Growbag Tomato Growhouse Garden Greenhouse with PVC Cover, 150x100x50cm- Plastic
- Balcony/patio
- 1 Year
Currently unavailable
Pros
- Sized to fit standard growbags
- Sturdy tubular steel frame with PVC cover
- Roll-up zipped door for ventilation
Cons
- Best suited to patios rather than full-size crops
£45.00
Pros
- Compact 4-tier design suits patios and balconies
- Clear PVC cover lets in plenty of light
- Roll-up door for easy access and ventilation
Cons
- Lightweight frame less stable in strong winds
At a glance
- Products
- 3
- Price range
- £19.99–£45.00
- Average price
- £29.65
- Average rating
- 4.13 / 5
- Total reviews
- 2,825
- Top brand
- VonHaus (1)
- Price tier split
- Budget2Mid-range1Premium0
- In stock
- 2
Expand your gardening season or nurture delicate seedlings with our selection of plastic balcony and patio greenhouses and cold frames. These lightweight structures offer a protective environment for plants, shielding them from harsh weather conditions like wind, rain, and frost – ideal for extending the growing period on smaller outdoor spaces. Constructed primarily from durable plastic, these models are easy to assemble and maintain, providing a cost-effective solution for serious or casual gardeners looking to cultivate herbs, vegetables, or flowers on their balcony or patio.
These greenhouses and cold frames are designed specifically for limited spaces like balconies and patios. Their compact size makes them easy to store when not in use, and the plastic construction ensures they’re resistant to rust and corrosion, common problems with metal alternatives. Many options feature clear panels for maximum light transmission, vital for healthy plant growth, while some include ventilation features to regulate temperature and humidity.
Whether you're starting seeds indoors or protecting established plants from unexpected frosts, a plastic balcony greenhouse offers versatility and convenience. Browse our range of models available on Amazon UK, with varying sizes and features to suit your specific gardening needs and space constraints.
FAQ
What size should I choose for my balcony?
Consider the available floor space on your balcony when selecting a greenhouse. Smaller cold frames are suitable for herbs and seedlings, while larger plastic greenhouses can accommodate tomato plants or other smaller vegetables. Always measure before purchasing to ensure it fits comfortably.
How durable is plastic greenhouse material?
The plastic used in these greenhouses is typically UV-resistant polyethylene, offering good durability against sunlight and weather exposure. However, avoid placing heavy objects on the structure and be mindful of sharp items that could puncture or tear the plastic.
Do I need any tools to assemble them?
Most plastic balcony greenhouses come with pre-drilled components and easy-to-use connectors. You’ll likely only require a Phillips head screwdriver for assembly, but check the specific product instructions before starting.
Can I use these greenhouses indoors?
While designed for outdoor use, plastic greenhouses can be used indoors to start seeds or create a miniature indoor garden – just ensure adequate ventilation and avoid direct sunlight exposure to prevent overheating.
What’s the best way to clean a plastic greenhouse?
Regularly wipe down the plastic panels with a damp cloth and mild soap. Avoid using abrasive cleaners that could damage the surface. Rinse thoroughly with water after cleaning.
How do I protect my plants from frost?
These greenhouses create a microclimate, trapping heat and protecting plants from light frosts. However, for severe frosts, consider adding extra insulation like bubble wrap or horticultural fleece to the inside of the greenhouse.
Are these greenhouses suitable for growing tomatoes?
Larger plastic greenhouse models can certainly accommodate tomato plants, providing a protected environment during early growth stages and offering some protection against pests. Ensure adequate ventilation and support as tomato plants grow larger.
Can I stack cold frames on top of each other?
While possible, stacking cold frames is generally not recommended due to stability concerns. If you choose to do so, ensure they are securely connected and that the weight distribution is even.
What’s the typical lifespan of a plastic greenhouse?
With proper care and maintenance, these plastic greenhouses can last for several years. UV exposure and physical damage are the primary factors affecting their longevity; check the manufacturer's recommendations for specific product warranties.
Are there any ventilation options available?
Many models feature adjustable vents or windows to control airflow and temperature within the greenhouse, preventing overheating during sunny days and maintaining humidity levels suitable for plant growth. Some have automatic vent openers to regulate temperature automatically.