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The Best 10 Glass Extension Companies 2024

Glass Conservatory


Are you deciding between having a glass extension, and one made from polycarbonate?

Did you know that glass extensions are far better at keeping out noise, as well as the weather?

Or that while glass extensions are typically more expensive, they tend to last much longer?

In this guide, you’ll find out everything you need to know about glass extensions, including the types of glass available and pricing.

Let’s go!

What’s in this guide?

Top 10 Glass Extension Companies

1. Apropos Conservatories


Type: Conservatory and extension company

Offers: Conservatories, extensions, doors, windows

Google Score: 3.6/5

Apropos Conservatories is a company that primarily designs and supplies conservatories and glass extensions to their customers, but they also offer a range of doors and windows too.

Their glass extensions are made from the highest quality materials, including thick glass, glazing and thermally broken aluminium systems.

They offer a completely bespoke solution which can be catered for your needs.

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2. IQ Glass

IQ Glass

Type: Extension and glass company

Offers: Extensions, windows, doors

Google Score: 4.5/5

IQ Glass is an architectural glass company, who can provide their customers with high-quality extensions, ‘glass boxes’, conservatories, doors and windows too.

Their glass extensions can come with either double or triple glazing, which has excellent energy efficiency and they are built to meet building regulations.

You can benefit from being able to use your glass box for either a conservatory or an extension, depending on your needs.

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3. Glass Design and Build

Glass Design and Build

Type: Extension company

Offers: Extensions, glass structures, glazing, doors

Google Score: 4/5

Glass Design and Build is a company that can offer their customers contemporary glass extensions and structures which can be used for living spaces and even fitted for kitchens.

Their specialist glass extensions can be customised to match your specifications, with additional products which can be installed like fully moving glass wall systems.

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4. Glass Extensions UK

Glass Extensions UK

Type: Extension company

Offers: Extensions, glass roofs and verandas

Glass Extensions UK is a glass extension company who can also provide their customers with high-quality glass roofs and verandas too.

Their modern glass extensions can come in a variety of styles such as contemporary or more historically attractive designs such as Victorian or Edwardian.

Each glass extension will come with sufficient insulation and double glazing, to keep your extension energy efficient.

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5. Duraflex


Type: Extension company

Offers: Extensions, conservatories, orangeries, doors, windows

Google Score: 3.8/5

Duraflex is a popular extension company who provides glass extensions and conservatories as well as orangeries to their customers, for an affordable price.

Their glass extensions can come in a variety of styles and customisable options, such as bi-folding doors, casement windows and double glazing.

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6. ODC Door and Glass Systems


Type: Glass structures company

Offers: Glass structures, doors, windows, roof lights

Google Score: 4.2/5

ODC Door and Glass Systems is a highly rated company who can offer their customers glass structures which can be used as extensions and garden rooms.

The glass extensions on offer from ODC feature a slim and minimalist look, specialised glazing, a range of styles on offer and finishes.

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7. Everest


Type: Conservatory company

Offers: Extensions, conservatories, windows, doors

Trustpilot Score: 4/5

Everest is a popular company who is well known for their conservatories, windows and doors. However, they also offer glass extensions to their customers.

These types of extensions typically feature a 10-year guarantee, a bespoke design, some finishes and colours available as well as enhanced security with the top of the range locking systems.

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8. Slimline Glazing

Slimline Glazing

Type: Glazing company

Offers: Glass extensions, doors, windows, rooflines, roof lights

Google Score: 3.2/5

Slimline Glazing is primarily a glazing company who specialises in providing high-quality windows, doors, glass extensions and rooflines to their customers.

Their glass boxes can be used as an extension, but their architectural glass can also be used for features or single glass walls too.

These extensions are energy efficient, meet all building regulations, allow a large amount of light into your building and come with an insurance backed warranty.

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9. Spectrum Architects

Spectrum Architectural Glazing

Type: Glazing company

Offers: Windows, doors, glass extensions, roof lights

Trustpilot Score: 5/5

Spectrum Architects are a highly rated glazing company, which was founded in 2003 to provide their customers with glazing products and glass extensions.

The glass extensions from Spectrum Architects features sun protection and resistance to burglars, as well as providing you with a clear view of your garden through your extension.

Customers can benefit from glass extensions which are thermally efficient and certified by independent institutes who have tested their products.

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10. Aspect Projects

Aspect Projects

Type: Extension company

Offers: Extensions, orangeries, verandas, doors

Google Score: 4.2/5

Aspect Projects is a Yorkshire based company who specialises in glass rooms and orangeries, which are catered to your exact specifications and can be customised with types of doors and windows.

Their glass extensions are made from high-quality aluminium and glass, which allows light into your home, but will enable you to be protected against the weather and thermal efficiency.

Each glass extension from Aspect Projects came with a 10-year warranty, fast installation times, quality materials and made in the United Kingdom.

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What are the different types of extension glass?

Here are some of the different types of glass you can use when designing your extension:

  • Self-cleaning
  • Laminated
  • Triple Glazed
  • Solar
  • Toughened
  • Curved
  • Frosted

Each one of these options has their benefits; here are a few for each choice.

Self-cleaning glass, as the name suggests, are self-cleaning by using the sun to break down and remove dirt.

Laminated glass is very tough and hard to break, which is why it could be an excellent choice for those who want to keep their extension secure.

Triple glazed glass means that your glass is insulated and helps you to reduce any potential heat loss dramatically.

Solar or heat reflective glass protects you from the sun’s harsh rays by reflecting them away and reduces heat loss.

Toughened glass is not only sturdy, but it smashes into a thousand simple pieces once broken, which makes it ideal in the case of a house fire.

Curved glass is traditionally used for period homes such as those that are Georgian and Victorian, so they might be an excellent choice if you want to retain a traditional style for your home.

Frosted glass allows you to benefit from getting light from the outside, but you still retain privacy by having clouded glass which you can’t see through. This might be a great idea if you wanted to turn your extension into a bedroom.

How much does a glass extension cost?

Extensions can cost upwards of £30,000; usually, glass extensions will cost more than those that are made from polycarbonate, which is a budget-friendly version of glass.

What are the benefits of having a glass extension?

Here are some of the benefits of having a glass extension:

  • Glass extensions keep out the noise and the weather
  • You can view your garden from a weatherproof extension
  • There are many different glass types to choose from
  • Could be more energy efficient than other options
  • Most suppliers will offer you a guarantee for several years

What is the best glass to use for an extension glass?

The best extension glass for you will depend on many different factors, including things like whether you need it to be self-cleaning, or you want the security of laminated glass.

What styles of glass extension can I have?


Typically has a slanted roof with clear windows around the extension.


An Edwardian extension is either square or rectangular, typically with a pitched roof that has four sloping sides.

These extensions look traditional and can give a sophisticated look to your garden.


Victorian extensions have a pitched roof, bayfront, and often has ornate details that are unique to this category.


Gable extensions are characterised by their roof, which doesn’t slope but stays upright.


Lean-to extensions are generally essential in the design and have a single slope for the roof and a rectangular shape.


You can also benefit from being able to choose between a combination of different styles, which depends wholly on which aspects of each extension you would like to add to your design.

What do I need to look after my extension?

If you want to clean your extension by yourself, here are some of the things that you might need:

  • Warm water and soap
  • Sponges and cloths
  • A vacuum
  • Telescopic cleaning brushes
  • A power washer

How long does installation take for an extension?

Extensions can take several months, or more than half a year to complete.

This will depend highly on which installer you choose, which is why it’s so important to compare all of your options before committing to a specific supplier.

How do I compare extensions?

Do you want to compare conservatories or extension companies?

Here’s a couple of ways that you can do that.

Firstly, you could approach each extension company and request a quote from each one, but this could take quite a long time as you’ll want to try and compare as many as possible.

Or, you could use the quick comparison tool that you can find at the top of the page; this will give you all of your available options within minutes, making it the fastest path to finding out which company is best for you.


In conclusion, a glass extension could be the best match for you and your home if you want the high-quality glass to help keep the weather out, and the light into your extension.

Are you ready to compare all of your extension options or companies?

Take a look at the easy and quick to use comparison tool at the top of the page, or you could take a look at the ExpertSure guides to find out more.


Let’s compare!

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