2.4m x 2.9m The Ultimate Greenhouse 6mm Twin Wall
DTGH-AS290-AKL
- Excellent Insulation: Polycarbonate panels provide superior heat retention compared to glass
- Optimal Ventilation: More vents than any other greenhouse on the market
- Stainless Steel Fasteners: Longer life and better durability
Couldn't load pickup availability
Dimensions
Dimensions
|
External Dimension (mm) |
2440 x 2940 |
|---|---|
|
Length/Depth (mm) |
2940 |
|
Width (mm) |
2440 |
|
Peak Height (mm) |
2270 |
|
Door Height(mm) |
1710 |
|
Door Opening (mm) |
920 |
|
Wall Height (including foundation) |
1410 |
|
Area |
7.17 |
Materials
Materials
|
Panel Thickness (mm) |
6 |
|---|
Structure
Structure
|
Number of Doors |
2 |
|---|---|
|
Number of Vent |
4 |
Warranty
Warranty
|
Frame Warranty |
5 Years |
|---|---|
|
Panel Warranty |
3 Years |
| - |
Shop Safely
Secure your shopping experience with various safe and trusted payment methods.
Ultimate 6mm Twin Wall Aluminium Greenhouse | 2.44 × 2.94m
Create the ideal environment for healthy plants with our Ultimate 6mm Twin Wall Aluminium Greenhouse. Designed for home gardeners who value durability and excellent insulation, this greenhouse features premium 6mm twin wall polycarbonate panels paired with a heavy-duty powder-coated aluminium frame for reliable year-round growing.
Manufactured using high-quality raw polycarbonate materials, the panels provide excellent light transmission and strength while helping to create a stable growing environment. The first-grade aluminium frame is corrosion-resistant, low maintenance, and designed for easy DIY assembly.
Want to learn more about panel thickness? Compare 6mm vs 4mm Polycarbonate Greenhouses to find the best option for your garden.
Ideal For
Perfect for growing:
- Vegetables
- Herbs
- Flowers
- Seedlings
- Potted plants
- Everyday home gardening
Whether you're starting seeds, extending the growing season, or creating a dedicated growing area, this greenhouse provides a practical and protected space for your plants.
Features
- Premium raw 6mm twin wall polycarbonate panels
- Heavy-duty 1.5mm powder-coated first-grade aluminium frame
- Excellent light transmission and thermal insulation
- Low-maintenance aluminium construction
- Slotted channel panel fixing system
- Double sliding doors with a 920mm opening for easy access
- Roof vents for natural ventilation
- Zinc-plated steel foundation frame with ground pegs included
- Easy DIY assembly
- 5-year frame warranty
- 3-year polycarbonate panel warranty
Why Choose This Greenhouse?
Built with premium materials and practical features, this greenhouse is designed to provide a reliable growing environment throughout the seasons.
The high-quality twin wall polycarbonate panels help retain warmth while allowing plenty of natural light to enter, while the heavy-duty aluminium frame offers long-lasting durability with minimal maintenance. The wide double sliding doors make it easy to move larger plants, pots, and gardening equipment, while the roof vents promote natural airflow to help regulate temperature and humidity for healthier plant growth.
Installation Notice
Proper anchoring is essential for safe installation.
Where possible, install the greenhouse in a sheltered location.
Greenhouses should not be installed in exposed locations that experience frequent strong winds.
Severe weather, storms, and extreme wind conditions may damage the greenhouse regardless of installation quality.
Specifications
Colour:
Green
Overall Dimensions:
2440 (W) × 2940 (L) × 2270 (H) mm
Door Width:
920 mm
Frame Material:
1.5mm Powder-Coated First-Grade Aluminium
Panel Material:
6mm Twin Wall Polycarbonate
Foundation Frame:
Zinc-Plated Steel
Ventilation:
Roof Vents
Warranty:
- Frame: 5 Years
- Polycarbonate Panels: 3 Years
Package Size:
- Carton 1: 298 × 18 × 18 cm
- Carton 2: 298 × 18 × 18 cm
- Carton 3: 142 × 75 × 21 cm
Total Weight:
95 kg
Package Includes
- 1 × Greenhouse
- 1 × Foundation Kit
- 1 × User Manual

We aim to deliver all products as soon as possible. Below is an outline of the services we offer on Steelmates products.
Standard Delivery
Steelmates will email you shortly after your order is processed to confirm your order has been placed successfully. We will then call you or send you an Email with a tracking number when your order is dispatched. The delivery is weekday service.
| Auckland | |
| Courier | 2-3 working days |
| Rural Courier | 5-7 working days |
| Transport | 3-5 working days |
| North Island | |
| Courier | 2-5 working days |
| Rural Courier | 5-8 working days |
| Transport | 4-7 working days |
| MainFreight Depot Pickup |
2-4 working days |
| South Island | |
| Courier | 2-5 working days |
| Rural Courier | 5-8 working days |
| Transport | 4-7 working days |
| MainFreight Depot Pickup | 2-4 working days |
Kindly be advised that the delivery time for the South Island is subject to variation based on the availability of stock at either our Christchurch warehouse or Auckland warehouse. In the case of large items requiring transportation, we kindly request that you allocate an additional 2-3 working days for delivery if the parcel originates from the North Island.
Delivery FAQ
Do I need to be home for my Delivery?
Yes, all of our products require a signature as proof of delivery. If you are not happy with your delivery date then please contact before the day to make alternative arrangements.
My house has a restricted access, what do I do?
Our drivers are only contracted to provide kerbside drop offs and deliveries. They will NOT bring any of our orders through your home. A driver may offer to take an order further; for instance a back garden but this is ONLY at their own discretion. If you have any questions about access or you live in a restricted access zone please contact us prior to ordering.
My Order Has Not Been Delivered, What Should I Do?
If your order has not been delivered when expected please feel free to contact us on 09-2740618.
Please Note: Additional items such as the riverter, security locks and shelving may be delivered separately on a different day to your main product. If you have ordered multiple products in one order then you may receive multiple deliveries.
Built for Serious Home Growers
Designed for gardeners who care about growing results, not just appearance, this greenhouse helps create a more controlled environment for planting, propagation, and seasonal growing. It is ideal for home growers who want better consistency, more confidence, and a setup that supports long-term use.
Greater Control Through the Seasons
A greenhouse gives you more control over your growing conditions, helping protect plants from changing weather while supporting a longer and more productive growing season. It is a practical solution for growers who want to start earlier, grow longer, and reduce the impact of outdoor conditions on plant performance.
See How Our Greenhouse Is Built
An independent YouTuber shows exactly how our greenhouse is constructed — no edits, no shortcuts.
6mm Twin Wall
A twin wall is a common configuration in greenhouses, but the thickness of the panel varies. Our polycarbonate panels are 6mm thick, which sounds like a small difference than 4mm, but it creates 20% effectiveness in heat protection, 5-10% less light transmission. It will also last longer, especially in the variable climate of New Zealand.
Improved Wind Resistance With Door Lock
The greenhouse is able to withstand strong wind from the outside, however, if wind gets inside through the door, the greenhouse becomes vulnerable and some panels may be lifted off. For this new series of greenhouses,, we have added a door lock to keep the door securely closed.
Extensive Reinforced Bracing
Every panel has extra diagonal bracing behind their back, protecting them in severe weather conditions. There are also horizontal bracings added under the peak, which stabilize the structure of the whole greenhouse.
Stainless Steel Fasteners
Upgraded stainless steel bolts and nuts, they are rust proof as the aluminium profiles. It will support the greenhouse for many years to enjoy with peace of mind.
Optimal Ventilation
A well-ventilated greenhouse maintains stable temperatures and healthy humidity levels, helping prevent overheating, condensation, and disease.
These easy-to-open vents can be operated with one hand, or you can get an automatica vent opener.
Polycarbonate vs Glass Greenhouse
Poly Greenhouse
✔ Excellent Insulation: Polycarbonate panels provide superior heat retention compared to glass, helping maintain stable temperatures and extend your growing season.
✔ Impact-Resistant & Virtually Unbreakable: Designed to withstand hail, strong winds, and accidental knocks.
✔Diffused Light for Healthier Plants: The twin-wall structure gently diffuses sunlight, reducing harsh shadows and preventing plant burn.
✔ Energy Efficient & Cost Effective :Better insulation means reduced heat loss, helping you save on heating costs during colder months.
✔ Easy Installation: Lightweight panels are easier to handle and install, simplifying assembly and reducing setup time.
Glasshouse
✔ Maximum Light Transmission: Tempered glass allows more natural sunlight to reach your plants, promoting stronger growth, healthier leaves, and better yields throughout the seasons.
✔ Safer by Design: If broken, tempered glass shatters into small, blunt pieces, making it a safe choice for families
✔ All-Weather Reliability: Built to handle temperature changes, strong winds, and harsh outdoor conditions, tempered glass keeps your greenhouse dependable.
✔ Premium Look & Feel: Tempered glass gives your greenhouse a professional, high-end appearance that blends beautifully into any garden setting.
✔ Easy to Clean & Maintain: Smooth, non-porous surfaces resist staining and can be cleaned quickly
Everything for Planting & Garden Care
From seedling tools and irrigation products to pruning, composting, and plant protection, explore useful garden supplies for every stage of growing.
We Give Back
We support New Zealand conservation by donating to non-profits, and through “Greenhouse Grows, Tree Follows,” we plant one native tree for every greenhouse sold, helping restore habitats and support a healthier climate.
Geenhouses Buying Guide
Essential reading for anyone planning to buy a greenhouse
Greenhouse Gardening Guide
Get tips, tutorials, and resources to start gardening with ease.
