Can a Greenhouse be Double Glazed?

It is always nice to enjoy the outdoors, but what if you live in a place where it gets really cold during the winter? One solution would be to build a greenhouse. But can your greenhouse be double glazed? When it comes to double glazing greenhouses, there are a few things to think about. We came up with the idea of putting our findings together in this post, which covers double glazed greenhouses.

A greenhouse can be double glazed. It’s not only feasible, but it’s also a great method of keeping a greenhouse warm in the winter months, allowing certain plants or shrubs to grow. Despite the fact that double glazing is typically more expensive, it is a long-term investment that may help you save money on heating during the colder months.

There are many benefits to adding this layer of protection, which we will discuss below:

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Table of Contents

Things to consider when using double glazed glass for a greenhouse

Keep in mind that a greenhouse is used for growing plants, which means that you will need to have an opening or vent somewhere. You can either use two vents and put them on opposite sides of the glass structure or simply try to find one well-placed window.

The main purpose of double glazing greenhouses is to keep it warm inside during the winter months. If you live in a place where your summers are hot – this might not be such a great idea because the extra layer adds insulation and may make it difficult for airflow within your greenhouse.

Be sure to check out what type of materials were used by the company that sold you the product before purchasing anything, as some companies sell single shard glasses instead of true double glazed glass. These products may still be useful, but it’s important to know what you are buying beforehand.

Double glazing will provide the finest feasible growing environment and energy efficiency if your goal is to produce the greatest amount of food with the least possible labour. Double glazing, on average, cuts heating expenses in half compared to single-pane glass greenhouses. The initial investment for double glazing is significantly greater than that for a single pane greenhouse, but it will soon pay for itself as you save money over time.

retain heat

Double glazing is something you reap rewards from in the long term.

It may seem like an expensive investment at first, but you will notice the difference in no time. Double glazed greenhouses are a great way to enjoy gardening year-round without paying too much for heating bills during the winter months.

With that being said; it’s important to do your research before buying anything and be sure of what type of quality material was used when creating these types of products. The benefits double glazing brings is something worth investing in as well.

Save heating costs with double glazing in a greenhouse

A low-energy reflective coating, which is applied to the inner glass pane, is another method for keeping double-glazed windows warm. It acts as an excellent insulator while also reflecting heat.

excess heat

What are the benefits of having a double glazed greenhouse?

Double glazing provides the finest feasible growing environment and energy efficiency if your goal is to produce the greatest amount of food with the least possible labour.

  • Double glazed greenhouses are a great way to enjoy gardening year-round without paying too much for heating bills during the winter months.
  • Save heating costs with double glazed windows in a greenhouse.
  • A low-energy reflective coating, which is applied to the inner glass pane, acts as an excellent insulator while also reflecting heat.
  • Provides three times the resistance to heat loss as a regular single pain greenhouse
  • Controls extreme temperature changes
  • Saves money in the longterm
  • A smarter looking alternative compared to other types of greenhouses

Another advantage of utilizing double-glazed glass is that it may be obtained for a low price and used to construct your own. Upcycling websites frequently feature windows, so if you have some construction experience or know someone who does, this could be a fantastic option.

glazing material

Growing plants all year round is easy with double glazed greenhouses

Building your own greenhouse may appear to be a difficult job, but it is well worth it. If you want double glazing, you might be able to grow all year round, even in the winter. Whether you decide to get a second-hand glass greenhouse or buy a brand new one, double-glazing is well worth the effort. The types of plants that you can grow as an example are geraniums, fuchsias and cacti.

building a greenhouse

How much light doubled glazed glass lets in

Light penetration is one of the most important issues for a gardener when it comes to greenhouses. It’s generally accepted that the more light that enters, the better. This is true in some cases, but it all depends on what you want to cultivate in your greenhouse. Some plants and vegetables like bright, hot weather while others prefer less sunshine.

greenhouse retaining heat

Comparing double-glazed glass to single glazed glass for greenhouses

The light transmission of single glazed horticultural glass and plain double glazed glass is not significantly different. Single glazing allows 95% of sunlight to pass through, while double glazing lets 80% of the light to go through.

Lowered light transmission may benefit winter-farmed crops since some vegetables actually do better with less sunlight throughout the day. Through the course of the day, these winter farmers would find that their plants require significantly less light.

letting in sunlight

The lower number of light flowing in from greenhouses with double glazed windows is not an issue

The 15% reduction may appear to be a lot, but it still provides enough light for the greenhouse to be a flourishing, growing environment. In fact, it is only slightly lower than many twin-wall polycarbonate sheeting greenhouses, so there is no need to be concerned about.

A double-glazed greenhouse in the right position may be a fantastic growing environment, provided it gets enough sun.

greenhouse light reduction
growing plants in greenhouse

The placement of a double-glazed greenhouse

Another factor to consider when selecting a double-glazed greenhouse is where to put it. Obviously, this is largely determined by the amount of room in your garden or allotment, but there are several basic guidelines that you should try to follow to get the most out of your greenhouse.

allotment and placement

Site the double glazed greenhouse near to nature's elements

Every garden has its own micro-climate, and everyone is different. Avoiding harsh winds and frost pockets while receiving plenty of sunshine exposure is a good rule of thumb when putting up your greenhouse.

Places that receive the full sun are best for double glazed greenhouses

One of the most essential items to consider when planning your own greenhouse is what you intend to grow inside it. Do the plants require a lot of sunshine? Sun exposure is important, as is afternoon shade for some plants and shrubs.

When determining the best location for a greenhouse, several elements should be considered, such as how much sunlight it will receive in that position and whether or not it will have access to water or electricity.

However, providing too much heat to the greenhouse is not good for plants. Ventilation systems are especially important for bigger greenhouses.

For double glazed greenhouses, flat surfaces with excellent draining ground are ideal

A greenhouse should be constructed on a solid foundation with excellent ground drainage. In the winter, frost will not build up in the greenhouse since it will drain properly.

It’s also ideal to put a greenhouse on the south side of a home since this part of the day is usually exposed to the most light. In most circumstances, placing it north to south provides greater illumination.

garden drainage

The greatest choice for a double glazed greenhouse flooring

It’s a widespread misconception that concrete or brick foundations are the ideal flooring materials for greenhouses. Even though these hardwood flooring may be aesthetically appealing, they can also promote mould and carry diseases.

mold on plants
brick walls halfway

Bricks are excellent for flooring in double glazed greenhouses, but there are certain things to consider

Bricks can add moisture to the greenhouse, but they should be laid on top of the sand for better stability and drainage. These materials are also more expensive to employ and require more effort.

Double glazed greenhouses can benefit from pea gravel as a flooring material

A simpler choice might be better suited for the floor of a double-glazed greenhouse. One of the most effective combinations is pea gravel and specially manufactured greenhouse flooring. The gravel flooring allows for excellent drainage, while the specific flooring ensures that no weeds grow. Unlike concrete, this flooring can be readily cleaned and disinfected if you are worried about germs.

Another excellent flooring option for double-glazed greenhouses is a stone foundation with wood

A wooden frame may be built and then filled with crushed gravel or pebbles, after which weed cloth can be added. This will result in a well-draining, low-cost, and simple-to-clean floor.

weed cloth
wooden frame for greenhouse

Look into lava rocks as a flooring option for greenhouses with double glazing.

In addition, a lava rock and landscape design will add character to your home. The lava rocks are excellent for absorbing extra water and boosting overall humidity, but they may be difficult to clean.

There are no wrong or right choices when it comes to greenhouse flooring, but certain materials will keep the air cool while others can lose heat. It’s crucial to select a solution that meets the plants you want to cultivate and your greenhouse’s unique demands.


FAQ's Are greenhouses bad?

Plants can be stressed by too much heat, moisture or humidity. However, if the greenhouse receives adequate ventilation and airflow then this shouldn’t be a concern. A single glazed option is best for areas that receive high levels of precipitation to avoid rot and mould growth on your plants.

Are greenhouses good for growing vegetables?

Greenhouse vegetable gardening has become popular in recent years because it’s possible to grow food all year long without having to deal with cold weather and soil preparation problems. This sort of sustainability allows gardeners who may not have space outside their homes the ability to garden indoors during winter months while also controlling diseases such as blight which require plenty of sunlight exposure.

Can greenhouse glass be recycled?

Greenhouse glass is popular for recycling because of its durability and transparency. Greenhouses are more-or-less permanent structures, so it can be useful to recycle their glass rather than having it sit in a landfill where the material will not decompose over time.

Should I open greenhouse door?

On sunny days, open all doors and vents. On hot nights, they may be left open if the temperature does not drop much. Vents and doors are frequently left half-open in changing weather to limit significant temperature rises.

Should greenhouse be airtight?

It is important for a greenhouse to remain as airtight as possible. If there are any cracks where warm outside air enters the structure, it can cause a significant amount of heat loss and make heating more expensive during the winter months.

Should greenhouse be clear or opaque?

Greenhouses can be either clear or opaque, but the former will usually require more upkeep and cost. In addition to proper insulation materials inside of a greenhouse, it is important for there to be some type of covering over the structure in order to keep out pests such as insects that could damage plants.


If you’re considering building a greenhouse, double glazing it with the right materials is essential to keeping your plants healthy. Double-glazed greenhouses provide excellent insulation and heat retention during cold seasons while also protecting against extreme temperatures in hot seasons that could damage plant life.

To avoid wasting resources on something as important as a greenhouse, be sure to select flooring wisely so that it doesn’t have any negative effects on air quality or moisture levels inside of the structure. In addition, ensure there’s adequate ventilation for optimal airflow throughout the day and night since stagnant air can cause mould growth.

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Oliver Wright
Oliver Wright

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