Garden Glasshouses

Premium Glasshouses for Year-Round Growing

Create a stronger, more productive growing space with our range of premium garden glasshouses. Designed for home gardeners who want better light transmission, a more solid structure, and a cleaner finish, our glasshouses are ideal for growing vegetables, herbs, seedlings, and flowers in New Zealand conditions.

 

Polycarbonate Greenhouse or Glasshouse?

Find the right growing space for your garden. Compare warmth, natural light, durability and appearance to choose the option that suits your needs.

Polycarbonate Greenhouse or Glasshouse?
Features
2.4m x 4.4m The Ultimate Greenhouse 6mm Twin Wall Aluminium Greenhouses Steelmates
Polycarbonate Greenhouse
Lightweight, impact-resistant panels retain warmth and soften sunlight, helping vegetables, herbs and seedlings thrive.
PC Curved Glasshouse 4mm toughened glass 2640 x 3830 x 2550mm Glasshouses Steelmates
Toughened-Glass Glasshouse
Enjoy natural light, clear views and timeless style with a toughened-glass growing space for your garden.
Insulation & Heat Retention Insulating air pockets help retain warmth and reduce heat loss during cooler weather. Single-pane glass provides less insulation, allowing heat to escape more quickly.
Natural Light Diffuses sunlight for softer, more evenly distributed light and fewer harsh shadows. Clear glass allows more natural light through; frosted roof options soften incoming sunlight.
Growing Season Better heat retention helps support growing into cooler months. Excellent light transmission supports growing when daylight is limited; additional warmth may be needed.
Impact Resistance Highly resistant to accidental knocks and impacts, with a low risk of shattering. Stronger than ordinary glass, but can still break under severe impact.
Safety Lightweight glazing that does not shatter like glass. If broken, toughened glass breaks into small fragments, reducing injury risk compared with ordinary glass.*
Appearance & Visibility Practical garden appearance with translucent panels that soften the view inside. Clear views and a classic, premium finish that makes an attractive garden feature.
Heating Efficiency Better insulation can reduce heating requirements when maintaining a set temperature. Greater heat loss can increase heating requirements during colder months.
Installation & Handling Lightweight panels are easier to lift and position during assembly. Heavier panels require careful lifting, handling and installation.
Cleaning & Maintenance Clean gently with a soft cloth and a suitable mild cleaner to avoid scratching. Smooth, scratch-resistant glass is easy to clean and maintains its clarity well.
Long-Term Glazing Condition Panels may scratch or weather over time; lifespan depends on quality and exposure. Glass retains its clarity over time and does not yellow with sun exposure.
Summer Ventilation Requires ventilation and, when necessary, shading to manage heat. Requires ventilation and, when necessary, shading to manage heat.
Best For Gardeners prioritising insulation, impact resistance and value. Gardeners prioritising natural light, lasting clarity and garden aesthetics.
Product links View Poly Greenhouse View Glasshouse

Steelmates Greenhouse Features

Our greenhouse range is well designed with the following features

  • Premium Construction Materials

    Featuring powder-coated aluminum framing and a galvanized steel powder-coated base, our glasshouses resist corrosion and maintain structural integrity over time.

  • High-Quality Fastenings

    Equipped with 304 stainless steel bolts, nuts, and fasteners, our glasshouses guarantee exceptional stability and resistance to rust, providing a secure and reliable structure.

  • Durability and Strength

    Built with 4mm tempered (toughened) glass, our glasshouses offer superior strength and safety, ensuring long-lasting durability for all weather conditions.

  • Exceptional Wind Resistance and Warranty

    Designed to withstand winds up to 110-120 km/h and backed by a 10-year structural warranty, our glasshouses offer unmatched protection and peace of mind.

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What is a glasshouse used for?

A glasshouse is used to create a protected growing environment for plants, vegetables, herbs, seedlings, and flowers. It helps shelter plants from wind, cold, heavy rain, and pests while allowing in plenty of natural light.

What can I grow in a glasshouse?

You can grow a wide range of plants in a glasshouse, including tomatoes, cucumbers, capsicum, herbs, leafy greens, seedlings, flowers, and many other vegetables and ornamental plants.

What is the difference between a glasshouse and a greenhouse?

The terms are often used interchangeably. In many cases, a glasshouse refers to a structure with glass or clear panels designed for growing plants, while greenhouse is the broader term commonly used for all protected garden growing structures.

Why choose a glasshouse for gardening?

A glasshouse helps extend the growing season, improves plant protection, supports seed starting, and creates a more stable environment for healthy plant growth. It is ideal for gardeners who want better control over growing conditions.

What size glasshouse do I need?

The right glasshouse size depends on your available space, what you want to grow, and whether you need room for seed trays, pots, shelves, or taller plants. Many gardeners choose a slightly larger glasshouse than they first planned so they have room to expand.

Where is the best place to put a glasshouse?

A glasshouse should ideally be placed in a sunny, level area with good drainage and convenient access to water. It is also helpful to position it where it is protected from strong winds where possible.

Does a glasshouse need ventilation?

Yes, ventilation is important in a glasshouse. Good airflow helps regulate heat, reduce excess humidity, and support healthier plant growth. Roof vents, doors, and windows can all help improve ventilation.

How do I maintain a glasshouse?

Glasshouse maintenance usually includes cleaning the panels, checking the frame and fittings, keeping vents and doors working properly, and monitoring temperature, humidity, and watering needs throughout the growing season.

Can a glasshouse help protect plants from pests?

Glasshouse maintenance usually includes cleaning the panels, checking the frame and fittings, keeping vents and doors working properly, and monitoring temperature, humidity, and watering needs throughout the growing season.

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Designed for Strength, Light & Everyday Use

A quality glasshouse does more than protect plants — it helps you extend the growing season and create a more controlled environment for healthy growth. Whether you are looking for a compact option for a smaller backyard or a larger glasshouse for serious home growing, this collection includes practical choices for a wide range of spaces and needs.

Choose the Right Glasshouse for Your Garden

Our glasshouse range includes different sizes and styles to suit modern homes, lifestyle blocks, and dedicated backyard gardeners. If you are comparing materials or planning a full growing setup, you can also explore our planting collection for irrigation and plant care essentials, or browse our greenhouse accessories to complete your setup.

Build a Complete Growing Setup

Choosing the right glasshouse is only the first step in creating a successful growing space. To get more from your setup, pair your glasshouse with practical add-ons and planting essentials that make everyday gardening easier and more efficient.

Helpful Add-Ons for Better Growing

Browse our range of greenhouse accessories to improve ventilation, organisation, and day-to-day use. You can also explore our planting collection for watering systems, plant protection, and garden tools that support healthier growth throughout the season.

Explore More Growing Solutions

If you are still comparing options, take a look at our wider range of polycarbonate greenhouses and related garden growing products to find the best fit for your space. With the right combination of structure, accessories, and planting tools, you can create a glasshouse setup that is practical, durable, and enjoyable to use year after year.