Double Glazing Cost

Double Glazing Prices 2020

What is the Average cost of Double Glazing?

Depending on the type and size of window you are looking for, double glazing prices in 2020 can run from around £150 to £600 per window. If you are replacing several windows at the same time, the average cost per window will get lower.

The cost of double glazing for your property is going to be influenced by several factors such as:

  • Style: Casement / Sash / Tilt & Turn Etc.
  • Size: bigger windows cost more.
  • Frame material: UPVC / Aluminium / Timber Etc.
  • Frame colours & finishes: Wood grain effect adds around 10% to double glazed window costs.
  • Accessories: Window handles, cills, Georgian bars, patterned or leaded glazing tc.
  • Energy efficiency: A++ windows typically cost more than B rated windows.
  • Installer: Prices vary by region & company (London prices generally higher).
  • Guarantees: Costs vary by company & product.

Because of this variation, it’s always best to get at least 4 written quotations from different companies – both local and National. This way you will get a better idea of what is the average cost to replace windows in your home.

What is the double glazing cost for a new window in 2020?

upvc windows - Double Glazing Cost

Upvc Window Frame Cutaway View

As we said above, prices vary, but you can expect to see average replacement window prices in the market for the following popular window types:

  • Casement window prices from £300 to £450
  • Sash window prices from £500 to £800
  • Tilt & turn window prices from £450 to £650

If you are changing from one type of window to another, you should also bear in mind that the frame thicknesses can be different.

For example, Sash windows have quite thick outer frames.

That can mean, if you are changing from Sash to Casement (or the other way around), it may involve extra labour and materials to “make good” on the interior window reveals.

What are the Average Double Glazing Prices for A House?

Maybe you are thinking of doing a complete makeover and are wondering how much does it cost to double glaze a house?

Of course, this is only a rough guide, but if you want to combine lower prices with good energy efficiency and long lifespan, then your best bet is going to be to use UPVC double glazed windows.

For just the front of a terraced property, assuming 3 windows, you could expect to pay around £1,500. If you are going to change the front door at the same time, you should allow for an extra £600 to £1,000 depending on the door type. A UPVC front door can cost £500 to £600 fitted, but composite doors will cost over £1,000.

The cost of double glazing for a 3-bed semi with 6 to 8 UPVC Casement windows prices can go from £4,500 to £7,500.

If you want to install new Sash windows, the cost can rise to between £8,500 and £10,000.

You can get free quotes for the cost of double glazing your house here: GET QUOTES

What are the different types of double glazing?

Of course, you can get double glazed windows in a number of different styles, however, some are more popular than others.

Here is a brief guide to the main differences between the most popular types of replacement windows.

Casement Windows

Seen almost everywhere in modern homes in the UK the casement window style is hugely popular, especially UPVC casement windows.

Although you can get versions that do not open at all, a standard casement window will open outwards from hinges mounted either on the left or right.

There are versions that open from the top which are called awning windows. Casements that open from the bottom are called hopper windows

Casement window prices 2020

Window Size in MM                      Frame Material                               Price Guide

  • 600 x 900                                     uPVC                                       Around £200
  • 1200 x 1200                                   uPVC                                       Around £300
  • 940 x 1600                                    uPVC                                       Around £450
  • Semi-detached 3 bed house         uPVC                                   £4,500 to £7,500

Sash Windows

Easily identified by the way the windows open by sliding up and down. Basically, a window of 2 vertical halves, the top and bottom.

The 2 versions of this style are called single hung and double hung. Single hung windows have only the bottom section opening – double hung can have the top and bottom opening.

They work by sliding on tracks built into the sides of the outer frame. The weight of the moving window sashes is supported using counterweights attached to the window via a “sash cord”. The cord runs from the window up & over a pulley wheel and connected to the counterweight. The weight is hidden within the outer frame – which is why Sash window frames are quite thick.

Some modern designs use a spring tension mechanism instead of the ropes & counterweight system.

Sash Windows Prices 2020

Window Size in MM                      Frame Material                               Price Guide

  • 600 x 900                                          White uPVC                                      from £550+
  • 1200 x 1200                                      White uPVC                                      from £650+
  • Semi-detached 3 bed house         Timber                                               £10,000 upwards

French Windows

In reality, this style is just a variation on the casement window design. The signature appearance is that of a matched side by side pair of casement windows.  The windows open from the centre, either out or inwards as per your choice.

Most installations do not have a centre bar, which gives a clear and uninterrupted view of the outside. You can have them fitted with a centre post (mullion) if you wish.

However, French windows cost more than standard casement windows.

French Windows Prices 2020

Window size in MM                       Specification                                     Average Price Guide

  • 1200 x 1200                                      White uPVC                                      from £300 to £400
  • 1200 x 1200                                      White uPVC, Georgian bars          from £350 to £400
  • 1000 x 1200                                      White uPVC                                      from £300 to £350
  •  1000 x 1200                                     White uPVC, Georgian bars          from £350 to £390

Tilt and Turn Windows

Quite a quirky style of window. The key feature of a tilt & turn window is its’ ability to open in 2 completely different ways.

  • Open like a regular side hinged casement window – however, they open inwards.
  • The opening window can be set to tilt or lean backwards to a fixed angle for ventilation.

You can’t “tilt” at the same time as you “turn”. Each action can only be carried out separately and is controlled by moving the handle in a certain direction.

Tilt & Turn windows are also especially useful to use as a means of escape in the event of an emergency. When the window is opened normally, the arc of opening is well over 90 degrees. This means it’s quite easy to climb out through one. Bear this in mind if you have curious children in the house.

Tilt and Turn Windows Prices 2020

Window size in MM                      Specification                                    Average Price Guide

  • 800 x 800                                          White uPVC                                      from £450 to £500
  • 1000 x 800                                        White uPVC                                      from £450 to £500
  • 1000 x 1000                                      White uPVC                                      from £500 to £550
  • 1000 x 1200                                      White uPV                                         from £520 to £550

Bay windows and Bow Windows

Bays and Bows are specialist designs, often referred to as projection windows. Bay windows are usually flat 3-sided rectangular designs – although some are angled.

Bow windows, on the other hand, curve outward.

It is exceptionally difficult to predict bow or bay windows prices due to the complex nature of their design. Typically, especially if you are adding a new bay window, there can be a lot of construction work in order to create the bay itself.

However, as a very rough guide, you can expect to see a 3 section bow window in uPVC to cost over £1,000. 4 and 5 section bow windows prices will run from £1,500 to £2,000+.

Double Glazed Window Accessories & Personalisation Costs.

Not everybody wants to look the same, and this also applies to peoples houses. If you want to add a personal touch, there are quite a few things that you can do to make your windows stand out from the crowd.

One popular option is to go for coloured windows.

With timber, this is very simple, just get a tin of paint and you’re off. With Aluminium and UPVC windows it’s usually an optional extra – with added costs.

You can expect coloured UPVC or windows to cost an extra 10% per window – the same can be said for adding a wood-grain finish on both uPVC and Aluminium.

Leaded, coloured or patterned glass.

Monkey tail window handle on UPVC frame

Monkey Tail Handles

It’s not possible to give you individual prices here, because this is a very selective subject. It’s going to depend upon the individual company you deal with, especially if you are dealing with custom leaded or stain glass windows.

With leaded glass, you can go for the authentic version, or the much less costly version of “stick-on” lead. This give the appearance of traditional leaded glass, but it is just a pattern laid on top of the glass itself. Check with your installer.

Georgian Bars

These make the windows appear to be made from a lattice of smaller panes. The bars can be real or with a double glazed unit you can pit inserts into the gap between the outer & inner panes of glass.

Inserts can cost anywhere from £20 to £50 per window.

Window Handles

Double glazed window handles come in a lot of shapes and sizes. A basic white handle with a simple lock can cost less than £5.00. On the other hand, an antique black Monkey tail handle can cost £12 to £15.

So for a fancy handle I would allow at least a few pounds per window.

But which type of double glazed window is the best? – Part 1


This, as they say, is the $64,000 question.

With personal preference as such an influencing factor, it’s better to ask “what is the best double glazing for me & my circumstances”.

In the beginning of your search, there will be a few clues, so to speak, that can help guide you towards making a good choice. The biggest 2 clues are:

  • Do the windows suit my property?
  • Are they within my budget?

Do the windows suit my property?

You can look at it this way. If you have a period home, it’s probably not going to suit tilt & turn windows for example.

If every other house in the street has Sash windows, will your house look out of place (and be less attractive) if you fit casement windows?

Using your Common sense is likely the best guide for you here.

Are they within my budget?

Well, this is a simple yes or no. However, are you willing to go a little higher for some better performing, better looking replacement windows. Usually it’s best to set your budget and keep to it if at all possible – allow an extra 10% for unforeseen expenses.

Which double glazed windows are the best? – Part 2


Other folks will tell you there is no such thing as the best double glazing, but we have decided to take a big risk and share our personal opinions on which type of double glazed window is the best.

So, in our humble opinion:

If you want some of the cheapest double glazed windows, with good energy efficiency, a good choice of design and widespread availability then UPVC windows are the best option in most cases.

If you have the budget and you want slimline designs with contemporary looks, some striking designs matched with very long lifespan and security, the Aluminium double glazed windows are the best.

To be fair, all modern double glazing windows will share a lot of the same benefits / features, so as long as you are buying quality products, you should get many happy years of service from them.

The best double glazing will also include:

  • 28mm sealed units are the best, 14mm are acceptable.
  • Low-e glass
  • A++ window energy ratings
  • Toughened glass
  • 75mm profile frames
  • 7 chamber frame profiles
  • Stainless steel fixings
  • Locks on all handles
  • Multi-point locks
  • Internal window beads
  • Gas filled sealed units – Argon is cheapest, Xenon is best.
  • 10-year minimum guarantee

At the end of the day, it’s what you can do to get the best double glazed windows for your budget.

Window Energy ratings and Double Glazing Vs Triple Glazing

Window Energy LabelsThe best performing windows in terms of energy efficiency are going to be A-rated. It is possible to go as high as A++, but, the extra performance comes with a price. That price increase is not always justified by the added savings on your energy bills.

In most cases in the UK, B-rated windows are perfectly acceptable. It’s not often that our weather is extreme enough for long enough to make A++ rated windows essential.

According to the Energy Savings Trust, the potential savings on your bills for a 3-bed semi are around £70 to £75 per year on B-rated windows and £85 on A++ rated windows – so the difference is quite small.

You can also apply this outlook to triple glazing. Compared to double glazing it does perform better “across the board” with better sound proofing and better insulation. Having 3 panes of glass also make the windows more secure.

However, a triple glazed window won’t last any longer than a double glazed window, but triple glazing will cost quite a bit more. In the UK, in our opinion, having triple glazing fitted by choice will be more for bragging rights than anything else.

To clarify the WER, or window energy rating, applies to the whole of the window unit, not just the double glazed part.

Ratings run from A to G, with G being the worst. A+ and A++ ratings are available in the market, as mentioned previously.

If you are looking for cheaper double glazing, then C-rated windows may be the ones to check out. These are the lowest acceptable rated replacement windows that meet current UK building regulations.

See more about energy efficient windows here in this article.


FAQ’S

Do I need planning permission to fit double glazing?
1). For double glazed replacement windows, it’s not usually necessary.

That is, unless you live inside a conservation area, an Area of Outstanding Natural Beauty (ANOB), live in a listed property or have article 4 direction that takes away your rights to many permitted developments.

2). What is my alternative to replacement windows?

In certain circumstances, it may be that secondary double glazing is the option that you can use.

3) When should I replace my existing double glazed windows?

There are some tell-tale signs that mean it’s about time to make a change:

  • Leaks or draughts from around the frame.
  • Heavy condensation inside the double glazed unit.
  • Warped or badly fitting windows.
  • Locks don’t engage properly.
  • If your existing windows are over 15 years old.
  • Joints on the corners are broken or cracking.
  • If your UPVC is badly discoloured over the years.
4) Is it better to repair or replace broken double glazing?

It really depends on what is damaged and how severe the damage is. For example, if your sealed units fog-up, it could be that the seals are useless and you can just replace the glazing not the whole window.

Get an inspection by a local installer and they will guide you.

5) Which is the best company to use to install my replacement windows?

In general, if you look for a company that is accredited by one of the major UK industry trade body, you should be able to rely upon the sales, installation and customer service of that particular installer. Most Trade bodies pre-vet and asses their members annually.

Look for:

  • GGF
  • FENSA
  • CERTAS
  • DGCOS
  • TRUSTMARK
  • FAIRTRADES
6) What are Gas filled units and should I have them?

As you know, modern double glazed windows are a sandwich of glass & air. An inner and outer pane separated by an air gap.

Air itself is not that good as an insulator, so sometimes a partial vacuum is created in its place. Better than a vacuum is to replace the air with a heavy gas. Heavy gasses do not circulate easily and therefore don’t transfer heat from one side of the window to the other.  Argon & Xenon gasses are used in place of the air in order to greatly reduce circulation & convection.

Gas filled units cost about £12 per square meter more than a regular unit – we think they are worth the money.

7) What are chambered UPVC frame profiles and why are they important?

Profiles are the lengths of UPVC that form the outer frames of your windows. Inside the profile is a sort of honeycomb, these are the chambers and they run the full length of the frame.

The chambers are there to trap air. Still air does not circulate. If the air does not circulate, it does not transfer heat. Therefore each chamber acts as an extra insulator. If you have a choice, go for a profile with a higher chamber count – 7 is about the highest.

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