Tunnel Greenhouse

A tunnel greenhouse—also known as a hoop house—is a type of greenhouse structure made with a series of curved supports, typically covered with polyethylene plastic. Unlike more rigid designs like rectangular or T-shaped greenhouses, tunnel greenhouses have a continuous, arched form that resembles a semi-cylinder. This shape provides excellent internal space and is particularly popular among vegetable growers, commercial farms, and serious hobby gardeners looking for maximum coverage at an affordable cost.

Tunnel greenhouses are often freestanding and easy to install, with fewer structural parts and quicker assembly time. Their rounded shape is naturally aerodynamic, making them more resistant to wind and heavy rain when properly secured. They’re especially effective for creating protected environments for early spring planting or extending the season late into autumn.

Benefits of the tunnel design

The arched design of a tunnel greenhouse offers several functional advantages. Firstly, the smooth curve allows snow and rain to run off easily, reducing the risk of structural strain or leaks. Secondly, it maximises headroom across the entire width of the greenhouse, providing more usable vertical space for climbing plants, trellising, or hanging baskets.

Tunnel greenhouses are highly space-efficient. Because they’re usually longer than they are wide, they make it easy to arrange rows of crops with optimal airflow between them. Ventilation can be achieved by simply opening the ends or adding roll-up sides—no need for expensive automated systems. Combined with low initial investment, this makes them one of the most economical solutions for serious growers.

They are also incredibly flexible. Whether you're growing tomatoes, chillies, lettuces or flowers, tunnel greenhouses provide a controlled environment that's easy to manage and scale.

Materials and construction options

Most tunnel greenhouses are constructed with a metal frame—often galvanised steel or aluminium—for durability and resistance to rust. The frame is then covered with greenhouse-grade polythene, which diffuses sunlight while retaining warmth. High-quality coverings can last 5–10 years depending on UV exposure and weather conditions.

More advanced models offer features like double-layer polythene with air inflation for insulation, anti-drip coatings, or reinforced mesh for added durability. Tunnel greenhouses can also be equipped with roll-up side walls, shade netting, and irrigation systems.

Because of their simplicity, many models can be assembled without specialist tools or foundations. They can also be easily relocated, making them ideal for rotating crops or moving the structure seasonally.

Best placement and garden fit

Tunnel greenhouses are particularly suited to larger gardens, allotments, or commercial plots where growing space is the top priority. Since they typically come in long, narrow modules, they can be placed in line with rows of crops or alongside existing planting beds. Their low profile makes them blend well into rural or agricultural settings, and because they're usually not permanent structures, they may not require planning permission (always check local regulations).

When positioning a tunnel greenhouse, the long side should ideally run east to west to maximise sunlight throughout the day. It’s also important to anchor the frame securely—either with ground stakes or concrete footings—to prevent shifting in strong winds.

Their portability and adaptability mean tunnel greenhouses are excellent for growers who want maximum control with minimal setup.

Why should you buy a tunnel greenhouse?

Tunnel greenhouses are a great choice for gardeners who prioritise growing space and cost-efficiency. They're especially suited for:

• Commercial growers and small-scale farms
• Gardeners looking to extend their growing season
• Crop rotation or seasonal greenhouse placement
• Maximising yield in long rows (e.g., vegetables, herbs, berries)
• DIY enthusiasts who want a greenhouse that’s easy to assemble and maintain

While tunnel greenhouses may lack some of the visual appeal of glass or cedar structures, they are unmatched when it comes to functionality and value for money. If your focus is productivity, they’re an ideal solution.