4 x 3m Walk-In Polytunnel Greenhouse with Reinforced Steel Frame - White
A professional-grade growing space featuring a heavily braced galvanised frame for superior stability compared to standard tunnels.
- Galvanised steel frame provides long-term resistance against rust and corrosion.
- Mesh windows allow for pest-free ventilation to protect delicate crops.
- Reinforcement rods and guy ropes included to secure the structure in exposed gardens.
- Two-layer grid-reinforced plastic ensures the cover stays intact through multiple seasons.
Ends Friday 31st July
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Delivery by 14th Jul 2026
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FREE UK mainland delivery
From our curation team
Why we recommend this
Often a strong fit for
- Allotments and large gardens
- Growing tall-stemmed plants like tomatoes and cucumbers
- Overwintering tender plants
- Starting seeds early in the season
This 4 x 3m walk-in polytunnel greenhouse provides a spacious and protected environment for growing a wide variety of vegetables, fruits, and plants throughout the year. Designed for durability in typical UK weather, it features a heavily reinforced frame and a tear-resistant cover to safeguard your crops from pests and the elements.
- Reinforced Steel Frame: Built with galvanised metal for rust resistance, featuring four sets of 'V' diagonal wall braces, six diagonal top braces, and four reinforcement rods for enhanced structural stability.
- Durable Protective Cover: The 140 gsm two-layer plastic cover includes an internal grid to prevent tearing while allowing 85% of natural sunlight to nourish your plants.
- Effective Ventilation: Equipped with six mesh windows and a large roll-up door, allowing you to regulate temperature and airflow while keeping insects out.
- Bury-in Cover Edges: Includes a 15cm overhang designed to be buried into the soil, providing extra tension to the cover and better resistance against wind.
- Full Accessory Kit: Supplied with four ground stakes, four guy ropes, ten plant labels, and a pair of gardening gloves to assist with setup and planting.
The internal dimensions offer 12 square metres of growing space with a 2-metre ceiling height, making it comfortable to walk inside and easy to manage tall-growing crops like tomatoes or climbing beans. The open floor design allows you to customise your layout, whether you prefer raised beds, shelving units, or direct ground planting.
Constructed with a focus on longevity, the galvanised steel core is designed to withstand seasonal use without the core strength degrading. The combination of guy ropes, ground stakes, and the weighted cover edges ensures the structure remains secure when properly installed in your garden or allotment.
| Assembled Length | 396 cm |
| Assembled Width | 300 cm |
| Assembled Height | 200 cm |
| Assembled Weight | 23.5 kg |
| Frame Material | Galvanised Steel |
| Cover Material | 140 gsm PE Plastic |
| Colour | White |
| Light Transmission | 85% |
| Number of Windows | 6 |
This product is dispatched and delivered by our approved partner, Giga from their UK warehouse.
- Cost: Delivery is FREE for all orders within mainland UK.
- Delivery Method: Please be aware that larger items are delivered kerbside (the street or pavement outside your property).
Easy Returns
Not the perfect fit? No problem. Our returns process is straightforward and completely free.
- 21 Day Guarantee: You can return your item up to 21 days after delivery.
- Online Portal: To start a return, simply visit our online portal and follow the prompts to generate your labels or schedule a collection.
For more information, please see our returns policy.
