About
Part of the same family as the TETRA, the TETRA Extra aluminium orangery offers a rectangular shape, distinguishing it from the quadrangular design of the original TETRA. This extended form provides additional length, making TETRA Extra ideal for hosting larger gatherings and accommodating more plants.
While TETRA Extra shares the same standard width options as TETRA (309 cm – 383 cm), it offers a broader range of length options (457 cm – 530 cm – 603 cm and beyond), allowing for greater flexibility in design and use.
For enhanced ventilation, comfort, and accessibility, we recommend adding extra doors and roof or side windows to your TETRA Extra orangery. Increasing the height of the structure can also create a more spacious and open environment, making it even more suitable for a variety of uses.
The TETRA Extra aluminium orangery is exceptionally versatile, effortlessly blending indoor and outdoor spaces to support a variety of activities for larger groups. It can function as a garden room, guest room, outdoor kitchen or living area, or even as a distinctive setting for dining, working, or meetings.
Standard features of TETRA Extra model:
- Width: 309 cm, 383 cm
- Length: see the size options below
- Wall height: 205 cm (standard), 215 cm
- Construction: aluminium: sturdy and stable, crafted from closed-type solid profiles
- Fasteners: stainless steel
- Colour (frame): mill finish aluminium or selected colour from the RAL Classic palette
- Glazing: glass (4 mm tempered, clear) or/and polycarbonate (10 mm twin-wall, clear)
- Glazing rubbers: EPDM, black
- Door: double sliding in the front wall*
- Windows: in walls or roof, with a mechanical handle*
- Rainwater downpipes, gutters: integrated, 2 pcs.
- Foundation: integrated aluminium base profile
- Installation: the greenhouse can be installed on the ground, on the terrace/site, or on a wall-type foundation
Note: Roof material of TETRA Extra W-383 cm - 10 mm polycarbonate (clear)
* Other options are available
Are you looking for a greenhouse of non-standard dimensions and configuration? Send us your request.

- The glazing materials used in our greenhouses are selected for their exceptional quality, durability, practicality, and strength. All materials comply with EN quality and safety standards, ensuring long-lasting performance, reliability, and peace of mind for year-round use.
- We recommend choosing between tempered glass or twin-wall polycarbonate, depending on your specific needs and preferences. For greater versatility, consider a hybrid approach – combining tempered glass and polycarbonate on different walls of the structure. This allows you to achieve the perfect balance of aesthetics, insulation, and light diffusion for optimal greenhouse performance.
- For more detailed information and advice on our greenhouse glazing materials, including care, replacement, and additional tips, please refer to the "F.A.Q." section below.
Install the greenhouse yourself
All GARDENIS greenhouses are designed for DIY (Do It Yourself) assembly, allowing you to construct the greenhouse independently after purchase.
Each package includes:
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Detailed assembly instructions in English, Lithuanian, Latvian, Estonian, Polish, Slovak, and Russian
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A comprehensive packing list
Before starting installation, carefully review the safety guidelines, required tools, and the step-by-step assembly instructions.
After assembly, please follow the usage and maintenance recommendations to ensure long-term durability and optimal performance of your greenhouse.






























