Best Double Glazed Windows and Companies

Double glazing will lower your energy bills, make your home warmer and quieter, provide added security, and will add value to your property.

To compare prices from the best local and national installers operating in your area fill out the form at the top of this page.



Who are the best double glazing companies?

There are thousands of double glazing companies in the UK. The best double glazing companies have their windows endorsed by The Energy Saving Trust for their energy efficiency, and approved for security by Secured By Design (SBD), the official police security initiative.

There are just 12 window companies in the UK who have had their windows endorsed by The Energy Saving Trust. These companies are either manufacturers and installers or just manufacturers.


Top Window Manufacturers and Installers

These companies both manufacture and install windows as one complete service. Learn more about the leading national installers.

Double glazing company
Number of windows endorsed by The Energy Saving Trust
Number of windows endorsed by SBD
Customer feedback score on Trust Pilot (Aug 2016)
Anglian
14
4
7.6 / 10
Everest
5
0
7.4 / 10
Zenith
2
2
8.0 / 10
Safestyle UK
2
0
8.8 / 10


Top Window Manufacturers Only

These companies only manufacture windows and do not install them for you. You can either buy direct or get your installer to buy the windows from them. Some of these manufacturers have a recommended installer database. Learn more about finding a local installer.

Double glazing company
Number of windows endorsed by The Energy Saving Trust
Number of windows endorsed by SBD
A and B Glass
6
3
CMS Window Systems
7
15
Direct Window Company
1
2
Duraflex
8
1
Masterframe Window
10
2
Tradesmith Ltd
10
2




Compare Double Glazing Prices In Your Area



Which double glazed windows are best?

There are 4 important factors to consider when deciding the best double glazed windows for your home:

1. Which style to choose?

There are many styles of windows to choose from. Casement, Sash, Tilt Turn and Dual Turn are the most popular styles.

Popular types of windows

You can learn more about the best styles below.

2. Which material to choose?

It is also important to consider what material will be best for your home. uPVC is the most popular, whilst timber / wood frames are a good option for more traditional homes and are considered the best looking type of window. Aluminium frames are a modern looking frame and are available in multiple colours.

You can learn more about the best material below.

3. Which product to choose?

It is important that your new windows are energy efficient and secure.

New windows and doors are given a energy efficiency rating by the British Fenestration Rating Council, known as the BFRC energy rating. The ratings range from A+, the most energy efficient, to G, the least efficient. Always try to go for the highest rated windows, as these will save you the most money in the long run.

You should also ensure your new windows meet or exceed the British Security Standard and are securely beaded to prevent removal of the glass from outside.

4. Which installer to choose?

When choosing a double glazing installer you have the choice of both local and national companies. While national installers are well known, local companies can offer competitive quotes and you have the added benefit of a local, personal service.

With a local service you will be able to ask for examples of their work in your neighbouring area so you can see their work before buying. It is always best to compare quotes from both local and national installers to get the best deal.



What is the best style of double glazing?

There are many styles of double glazing window to choose from. Some examples include sash windows, bay windows and tilt & turn windows. The type of window best for your property will depend on the style of the property.

It is always best to match new windows closely to the ones you are replacing. It is also important to note the predominant style of window on your street in order to fit in with the neighbourhood aesthetic. Casement style double glazing windows are the most popular and the type that will usually be quoted as standard, if you do not specify otherwise.

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What is the best material?

The next factor that can influence the best double glazing windows for your house is the material of the window frames. Most homeowners opt for upvc frames for their double glazed windows. Use the table below to compare the pros and cons of each material and decide which material is best for you.

Material
Pros
Cons
Notes
Low cost
Lightweight
Low maintenance
Recyclable
Durable
Frames usually white
Can get dirty quickly
Not a natural material
Not most visually pleasing
Unless you live in a listed building or a home with a specific look, upvc is probably the best option
Natural appearance
Natural material
Good insulator
Renewable material
Less durable
More expensive
Can swell
needs frequent painting
High maintenance
Only really a sensible option if you need wooden frames to fit with the aesthetic of your house or you live in a listed building
Durable
Weather resistant
Lightweight
Modern looking
Multiple colours
More expensive
Insulation issues
Risk of corrosion
Can look too modern
Less common
Not yet commonly used on residential properties. Main use is currently on large commercial type properties




Who are the best national double glazing installers?

Everest

Location: HQ in Cuffley, Hertfordshire. Manufacturing plants in Sittingbourne, Kent and Treherbert, Wales.

History: Founded in 1965, they have held on to their status as one of the market leaders in double glazing. Since founding, Everest have fitted double glazing in over 2 million homes.

Supplies to: Most of Britain, including Jersey. Do not cover Ireland.

Product overview: Everest sell double glazed windows and doors, they also offer secondary glazing. Everest work across all traditional window materials; upvc, timber, aluminium and composite.

Here is a comparison of Everest's latest window products:

Material
Style
Energy rating
Sealed unit (no condensation) warranty
Discolouration warranty
Whole window warranty
upvc
casement
Double A+ 12
Lifetime
Lifetime (white)
10 years
upvc
sash
B
10 years
10 years
10 years
timber
casement
A
10 years
5 years
10 years
timber
sash
A
10 years
5 years
10 years
aluminium
casement
B
Lifetime
25 years
10 years
composite
casement
Double: A2
Lifetime
NA
10 years

Table shows standard energy ratings, in most cases glass can be upgraded to A or A+.


Anglian

Location: Head office in Norwich.

History: Established in 1966 as Anglian Windows, now trading as Anglian Home Improvements, a part of the Anglian Group. Anglian have continuously expanded to become a market leader. Their ethos is that all of their products are made in Britain from start to finish.

Supplies to: Most of the UK, excluding Ireland.

Product overview: Anglian cover many types of double, triple and secondary glazing (upvc, wood, aluminium). Anglian also sell doors and porches, conservatories and garage doors.

Here is a comparison of Anglian's latest window products:

Material
Style
Energy rating
Frame warranty
Glass warranty
upvc
casement
A+
10 years
15 years
upvc
sash
B
10 years
15 years
timber
casement
A
10 years
15 years
timber
sash
B
10 years
15 years
aluminium
casement
B
10 years
15 years

Table shows standard energy ratings, in most cases glass can be upgraded to A or A+.


Safestyle

Location: Head office in Bradford, Yorkshire

History: Safestyle started as a single branch in Bradford in 1992. Now have 32 branches and 11 installation depots. They have now become one of the market leaders and are the Number 1 supplier of upvc windows and doors in the UK.

Supplies to: Over 40 branches nationwide, catering to most of England and Wales. They do not currently cover Scotland or Ireland.

Product overview: Safestyle only work with upvc. They offer upvc windows and doors of various styles. Safestyle recently introduced the Eco Diamond range of A rated glass, available in most of their window styles.

Here is an example of Safestyle's latest window products:

Material
Style
Energy rating
Warranty
upvc
casement
A (Eco Diamond Range)
10 years
upvc
sash
A (Eco Diamond Range)
10 years
upvc
bay
A (Eco Diamond Range)
10 years


Zenith

Location: Headquarters in Norwich.

History: Zenith was set up in 1969. After some initial growth and investment they opened their first manufacturing plant in Norwich in 1984. Today they have sales of 50,000 units per year.

Supplies to: Mostly the south of England and Wales

Product overview: Zenith specialise in upvc. They are proud of their woodgrain effect upvc ranges. Zenith introduced EcoTherm, A rated window technology in 2011, which uses recycled upvc material.

Here is an example of Zenith's latest window products:

Material
Style
Energy rating
Warranty
upvc
casement
A
10 years
upvc
sash
A
10 years
upvc
tilt and turn
A
10 years




How do I find the best local installers?

As mentioned above, you should compare quotes from both national and local installers. It is important to ensure your local installer is FENSA registered.

FENSA (Fenestration Self Assessment Scheme) is run by the Glass and Glazing Federation (GGF) to ensure installers comply with regulations. This protects you from cowboy installers and ensures you will receive a high level of service from your installer.



How Do I Find The Best Prices?

Step 1 - Click your location on the map below to get your FREE quote.
Step 2 - Once you answer a few simple questions, compare quotes in your area to find the best deal!



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