The Best 10 Glass Extension Companies 2026
Introduction
Are you deciding between having a glass or polycarbonate extension? Did you know that glass extensions are far better at keeping out noise and cold temperatures? Or that while glass extensions are typically more expensive, they tend to last much longer?
Modern conservatories or box extensions are often additional spaces made of glass that are connected to a home. In this guide, you’ll find out everything you need to know about glass extensions, including the types of glass used and their pricing.
Top 10 Glass Extension Companies
1. UK Modern Glass Extensions
- Type:
- Conservatory and extension company
- Offers:
- Veranda, patio, roof canopies and glass garden rooms
- Trustpilot Score:
- 4.5/5
UK Modern Glass Extensions specializes in glass canopies and rooms with aluminium frames. It usually takes 4-6 weeks to create their structures but installations only take up to 5 days, depending on the size.
They offer various canopy shapes depending on bespoke designs and bi-folding or sliding door options.
2. IQ Glass
- Type:
- Extension and glass company
- Offers:
- Extensions, windows, doors
- Google Score:
- 4.2/5
IQ Glass is an architectural company that provides high-quality extensions, glass boxes, conservatories, doors, and windows.
Their glass extensions can come with either double or triple glazing, which has excellent energy efficiency and are built to meet building regulations.
3. Glass Design and Build
- Type:
- Extension company
- Offers:
- Extensions, glass structures, glazing, doors
- Google Score:
- 5/5
Glass Design and Build offers contemporary glass extensions and structures that can be used for living spaces and even fitted for kitchens.
Their glass extensions can be customised to match your specifications, with additional features like fully moving glass wall systems.
4. Glass Extensions UK
- Type:
- Extension company
- Offers:
- Extensions, glass roofs, and verandas
Glass Extensions UK offers high-quality extensions, roofs, and verandas. Their glass extensions can come in a variety of styles, such as contemporary, Victorian, or Edwardian.
Each structure will come with sufficient insulation and double glazing to keep it energy-efficient.
5. UK Glass Rooms
- Type:
- Extension company
- Offers:
- Extensions, conservatories, glass rooms
UK Glass Rooms offer retractable canopies, and glass rooms and verandas. They use computer-generated designs to customise their structures according to customer specifications.
Their glass extensions come with a 10-year guarantee. There’s also no planning permission required.
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 that offers glass structures that can be used as extensions and garden rooms.
Their glass extensions feature a slim and minimalist look, specialised glazing, and a range of styles and finishes.
7. Everest
- Type:
- Conservatory company
- Offers:
- Extensions, conservatories, windows, doors
- Trustpilot Score:
- 2.7/5
Everest is a popular company well known for their conservatories, windows, and doors. However, they also offer glass extensions.
These extensions typically feature a 10-year guarantee, a bespoke design, various finishes and colours, and enhanced security with modern locking systems.
8. Simply Extend
- Type:
- Glazing company
- Offers:
- Glass extensions
- Google Score:
- 4.4/5
Simply Extend is a family-run company based in London. The company offers fixed, all-in packages that include project and design management.
Their glass extensions can cost from £3,000 per sqm, featuring high thermal efficiencies, double- or triple-glazed glass, and framed or unframed bodies.
9. Spectrum Architectural Glazing
- Type:
- Glazing company
- Offers:
- Windows, doors, glass extensions, roof lights
- Trustpilot Score:
- 4.8/5
Spectrum Architectural Glazing is a highly rated company founded in 2003 to provide glazing products and glass extensions. Their glass extensions feature sun protection and high security.
They are also thermally efficient and certified by independent institutes that have tested these products.
10. Finepoint Glass
- Type:
- Extension company
- Offers:
- Extensions, doors, windows, rooflights
- Trustpilot Score:
- 4.3/5
Finepoint Glass specialises in bespoke glazing and installation designs across the UK.
Their glass extensions are thermally efficient, has high-quality aluminium for frames, and available in various finishes. The company also uses smart glass, such as heated, electrochromic, and privacy glass.
FAQs
What are the different types of extension glass?
Here are some of the glass available:
- Self-cleaning
- Laminated
- Double- or triple-glazed
- Solar
- Toughened
- Curved
- Frosted
- Electrochromic
Here are the benefits for each glass type:
Self-cleaning glass uses the sun to break down and remove dirt.
Laminated glass is very tough and hard to break.
Double- or triple-glazed glass is well-insulated and helps reduce any potential heat loss.
Solar or heat reflective glass protects you from the sun’s harsh rays by reflecting them away and reducing heat loss.
Toughened glass is tempered glass that can be difficult to break. However, if it does smash, it breaks into thousands of blunt parts, making them safe for emergencies, such as fires.
Curved glass is traditionally used for period homes, such as those that are Georgian and Victorian, so they might be an excellent choice for traditional styles.
Frosted glass allows light to filter through, but you still retain privacy by having a clouded surface. This might be a great idea if you want to turn your extension into a bedroom.
Electrochromic glass is a type of smart glass that uses electricity to tint itself depending on the intensity of the sunlight, preventing heat from entering.
How much does a glass extension cost?
Extensions can cost upwards of £30,000. Usually, glass extensions will cost more than polycarbonate ones, which is a budget-friendly version.
What are the benefits of having a glass extension?
Here are some of the benefits of having a glass extension:
- Glass extensions keep out noise and rain.
- You can view your garden clearly and safely.
- There are many different glass types to choose from.
- It can 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?
The best extension glass depends on many factors, including additional features like self-cleaning, added security, or self-tinting.
What styles of glass extension can I have?
- Cheltenham. This typically has a slanted roof with clear windows around the extension.
- Edwardian. 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. Victorian extensions have a pitched roof, bayfront, and ornate details that are unique to this category.
- Gable. Gable extensions are characterised by their roof, which doesn’t slope but stays upright.
- Lean-To. Lean-to extensions are generally essential in the design and have a single slope for the roof and a rectangular shape.
- Bespoke. You can choose between a combination of styles, depending on the elements you want to incorporate.
How do I clean/maintain 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 weeks or even 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.
Conclusion
A glass extension can be great for your home if you want the high-quality glass to help keep the weather out but allow sunlight in. Prices will depend on the size, materials used, and design complexity.
To make sure you compare all your options, fill out the easy and quick tool at the top of the page, or you could take a look at the guides on this site.
