Replacement Windows

Replacement windows

Window Replacement

How to Choose Replacement Windows

  • uPVC, timber or aluminium
  • Casement, tilt and turn or sash
  • A wide range of colours and styles
  • Choose a window that's right for you

Have your windows seen better days? Do you suspect your double glazing isn’t keeping your room as warm as it used to? Do outdoors noises sound a bit louder inside your house? It might be time to look for replacement windows.

As a guide, we have listed everything you need to know about replacing windows, so you can make an informed choice on what is best for your needs. If you need any help, don’t hesitate to contact us or book a free appointment.

How Long Do Windows Last?

You should expect any window to last a minimum of 20 years, but with maintenance and varying factors, some windows can have a much longer life than expected.

Window materialLifespanConsiderations
uPVC20 yearsMinimal maintenance
Aluminium25 yearsMinimal maintenance
Timber50 years +Require regular maintenance

3 Things That Will Impact the Lifespan of Your Windows


The quality of window frame products varies dramatically between manufacturers and installers. Cheap uPVC will warp and discolour long before a quality uPVC frame would. If frames are not fitted properly, they can be prone to water ingress, damp and draughts that will speed up deterioration.


Developments in materials mean that uPVC is now far superior to the products made before 2000. Aluminium now has better thermal properties and stronger frames. Timber has to be maintained on a regular basis every few years to achieve anywhere near a 50-year lifespan.


The factor that contributes the most to shortening the lifespan of a window frame is the weather. A coastal fronted property has to contend with the corrosive effects of saltwater and high winds compared to a sheltered house. South-facing windows will also have to contend with the constant contraction and expansion caused by the heat of the sun.

Signs That Your Windows Need Replacing

Regardless of how long a window should last, it’s more important to regularly check your windows for wear and tear and look for signs that they might be getting to the end of their life.

Some issues can be easily fixed, such as loose handles and some issues are not critical to performance, such as discolouration - it just doesn’t look great.

If your window shows signs of more serious issues, then it’s better to consider replacing them to avoid costly heating bills or damp and black mould in rooms.

Draughts and Cold Spots Around Your Window

If your window seal fails, it can be difficult to replace it to achieve the same levels of efficiency as a new window. Around 30% of a property's heat is lost through poorly performing windows, so if you notice draughts around your window, your energy bill might be higher than it would be with energy-efficient windows.

Condensation Between the Double Glazing

Condensation on the inside of a windowpane is a sign windows are failing. Condensation between the panes of double glazing should never happen and this means your sealed double glazed unit has ‘blown’ and no longer offers any thermal efficiency. Condensation should be taken seriously as it can lead to damp and mould causing structural damage, and more importantly, serious health issues.

Outdoor Noise Levels Are Increasing

If you begin to notice outdoor noise becoming louder inside the house, as above, this means the double glazed unit has been compromised and is no longer efficient.

Problems Opening and Closing Your Windows

If your windows are becoming difficult to open and close, this can be due to the frames becoming warped or having expanded over time (timber frames). This means you will have gaps around the frames, reducing the energy efficiency and the security of the frame could be compromised.

Signs to look forChecks to make
Draughts around the frameFeel around the frames for blasts of air
Problems opening/closingDo the openers close tightly, or does it stick or have gaps?
Condensation between panesCheck for fogging between the double glazed panes
Discolouration and crackingCheck timber frames for dried exposed wood and cracks
Increased noise levels from outsideCan you hear more noise from outside inside your house?

Everest Window Materials

uPVC Windows →

Our bestselling windows are highly secure, energy-efficient and virtually maintenance free as uPVC will never rot, rust or flake. With A++ rated triple glazing, you get our most thermally efficient and secure window ever.

  • Our highest rated energy-efficient window
  • Our most secure window
  • Virtually maintenance free
  • Wide range of colours and woodgrain finishes

Timber Windows →

Crafted to perfection from sustainable sourced hardwood or softwood and laminated for extra strength. The micro-porous paint and stain finishes help keep timber windows protected from the elements, so they look their best for years to come.

  • Perfect for period and listed homes
  • Laminated for extra strength and rigidity
  • Micro-porous finish for protection
  • Choice of paint or stain

Aluminium Windows →

Add a contemporary style to any property, with our slimmest profile and range of modern colours. The slim frame and large glass area let more light flood into your home, while aluminium is so strong and robust, it requires very little maintenance.

  • Our slimmest frames
  • Strong and durable material
  • Low maintenance
  • Modern colour range

Types of window material

How to Choose the Right Window Material for Your Home

Historically, windows were made using timber frames. Steel windows came into use in the early part of the 20th century, followed by aluminium in the post-war period. uPVC windows were introduced in the 1980s as a more energy-efficient type of window, and remain the most popular window material to this day.

uPVC Windows

Long-lasting and low maintenance, offering high performance at affordable prices.

uPVC is a good all-round material for frames that will never rot, flake or rust. uPVC windows are still among the most energy-efficient available, and can achieve up to an A+ Windows Energy Rating if they have efficient double glazing.

uPVC is a popular choice for windows available in a range of colours. Cheap uPVC can discolour over time, but Everest frames have guarantees against discolouration on white frames.

uPVC is also available in a wood grain finish that emulates traditional timber frames with the benefit of no maintenance. This works especially well on sash windows.

uPVC windows are best suited to modern new build properties, suburban developments and terraced houses.

Timber Windows

Timber is a natural insulator and potentially the longest-lasting frame material (with maintenance).

Timber frames can be made from softwood or hardwood. Softwood is faster growing and cheaper. Hardwood grows slower and is more durable. Modern timber frames are engineered to be stronger, meaning they will not warp or bow, and can also be treated to resist rot and fungus.

The added beauty of timber is that it can have a stained or painted finish. It’s the only material that can be repainted a different colour, something to consider if you do like to change the appearance of your home.

Wooden windows can last for 50 years or more, but they are high-maintenance and will require constant attention to keep them in good condition.

Timber windows are best suited to cottages, rural properties, period properties and can suit modern builds.

Aluminium Windows

Aluminium has superior strength to other frame materials and is used in structural glazing and other commercial construction projects. In domestic properties, aluminium allows for a much thinner frame and a larger glass surface area, letting more light into the room.

As a metal, aluminium is a natural heat conductor. In the last 10 years, thermal barrier technology has improved massively, and aluminium windows can now achieve almost the same high energy ratings as uPVC windows.

Aluminium windows are also extremely weatherproof and low maintenance. Unlike other metals, aluminium does not corrode, so window frames will not rot, flake or rust. A powdered coated finish offers a range of colours with the most popular colours being dark grey and black for contemporary properties.

Aluminium windows are best suited to modern and contemporary properties that want a slimline frame and large glazed area.

Everest Window Styles

Casement Windows →

  • Highly thermally efficient
  • An array of colour options
  • Smooth or woodgrain
  • Highly secure

Tilt & Turn Windows →

  • Opens in for easy cleaning
  • Tilts for secure ventilation
  • An array of colour options
  • Smooth or woodgrain

Bay Windows →

  • A sense of space and light
  • Panoramic views
  • Four different configurations
  • uPVC, timber or aluminium

Sash Windows →

  • Replica traditional design
  • Smooth running mechanisms
  • Smooth or woodgrain
  • Traditional sash furniture

Types of window styles

Types of window styles

How to Choose the Right Window Style for Your Home

Casement Windows

Casement windows are the most versatile window frame style and can be adapted to most properties.

The casement window is hinged at the side, or top, and are usually made with a pair of window panes in one frame.

A white uPVC casement window is the most economical window you can buy.

Everest casement windows are available in uPVC, timber and aluminium frames in a wide range of colours and finishes.

Flush casement

A casement frame is available in standard or a flush design. A standard opening window will sit proud of the frame, but a flush casement window sits flush in the frame when it's closed. The frame looks more slimline and has a sleek appearance.

Casement style windows are best suited to cottages and rural properties in timber. Modern builds with flush aluminium frames.

Tilt and Turn Windows

A tilt and turn window has a multi-hinged frame that can be opened fully inwards, opened fractionally on a vent, or opened on a tilt at the top only.

Tilt and turn windows have become one of the most popular styles of window in uPVC or aluminium. The versatility of this multi-opening frame means they are ideal for above ground-level windows as they can be safely left open with a ventilation gap and opened inwards for cleaning.

Everest tilt and turn replacement windows are available in uPVC, with a choice of double or triple glazing.

The tilt and turn window is best suited to new build properties and multi-floor properties.

Sash Windows

Sash windows are a period style of frame that have two panels sliding vertically up and down across each other.

Usually found on Georgian properties in city centres, especially in London, and Victorian terraces (that haven’t been ripped out), a sash window in good condition has a beautiful classic appeal. But, it is high maintenance.

Modern sash windows offer smooth running mechanisms, well-fitted brush seals and double glazing for energy efficiency.

Everest sash replacement windows are available in uPVC or timber and double glazing.

Sash windows are best suited to Georgian and Victorian-style houses and period properties.

Bay Window

Bay windows are a feature of many Victorian and Edwardian houses in a front-facing living room. The window and floorspace protrude out from the main wall (a bow window is a protruding window and not the floor area).

The window gives panoramic views to each side of the window and floods a room with light.

Although, the bay window was actually designed to offer superior ventilation in a room.

If you already have a bay window, replacing the frames is straightforward. If you would like a new bay window at the front of your property facing the road, you will need planning permission. This is something that we can help you with.

Most Victorian bay windows were originally sash single-pane windows, but these have usually been replaced with uPVC. Modern bay windows on new build houses would usually feature a central large picture window with side casements windows that open are the best configuration.

Bay windows are best suited to most styles of houses that want to take advantage of a view and extra light.

How much do new windows cost

How Much Do Windows Cost?

Our guide to the cost of new windows to help you budget.


Window design ideas

Window Design Ideas

A selection of window designs to give you inspiration for your home.


How to choose replacement windows

How to Choose Glass for Windows

There are many different types of glass tailored to different needs in a home.


What's the Difference Between Double and Triple Glazing?

If they are both made from the same material and to the same quality standard then the triple glazing should be around 20-30% more energy efficient. However, there are lots of variables that can compromise the comparison between double and triple glazing:

  • Correctly spaced gaps between the panes.
  • Type of gas or coating used as the insulator.
  • Type and quality of the materials.
  • Level of tailored manufacturing to your home.

This means that it's possible for some lower quality triple glazing to be less energy efficient than good quality double glazing.

Triple glazing isn't the right choice for everyone. To understand what is a better long-term investment for your needs, book an appointment with our specialist advisors who can recommend the right glass for you.

Double GlazingTriple Glazing
Energy RatingA+A++
U Value1.31
G Value0.460.40
L Value00

How Much Do Replacement Windows Cost?

Costs can vary greatly for both the windows and installation. There are a lot of variables to consider and because we only offer bespoke installations, we can't show a price list.

To get an idea of industry standard prices, read our full guide about how much new windows cost here.

Things to Consider When Replacing Windows

Choosing the style of your replacement double glazing can be a confusing choice to make when buying new windows. Many factors need to be considered, these include:

  • What is the age or period of your property? Choose a style, material and colour based on what is right for your house. Some properties can be devalued if you fit the wrong style of window. For example, timber sash windows on a Georgian property replaced with uPVC casement windows.
  • What styles of windows look particularly good on your neighbours' homes or similar properties?
  • It's better to replace all your windows at once for uniformity of appearance, if your budget allows. This can also help to increase the value of your property.
  • It may be worth asking your neighbours if they are also thinking about replacement windows as uniformity over several adjacent properties can also help to increase value. Everest also gives greater discounts for several properties buying at the same time.

High Quality Windows Guaranteed

  • Lifetime guarantee against fog & condensation between panes*
  • 20 year guarantee against discolouration of white uPVC
  • 25 year guarantee on aluminium finish
  • 30 year guarantee against rot & fungus on timber windows
  • 10 year guarantee on window including hinges, locking & installation

*Only available on Exclusives uPVC Casement windows.


A double glazed uPVC window with secure GrabLock from Yale

Replacement Window FAQs

  • +
    Is window replacement worth the cost?

    Investing in new windows will have an immediate impact on the energy efficiency of your home. Rooms will be warmer and your heating bill will reduce.

    Quality windows will also increase the value of your home and make it more appealing to buyers if you want to sell. On a long-term basis, quality windows can maintain good structural integrity and avoid issues with damp and mould.

    Considering all factors, replacing old inefficient windows is worth the cost and a good investment.

  • +
    Should I replace all windows at once?

    It is better to replace all windows at once. Firstly, because the aesthetic of the property looks better with uniformity. This will help the value of your property and make it more appealing to buyers.

    Secondly, it is far more cost-effective to replace all windows at the same time. Installers work on a basis of having fixed costs to attend a job. The more windows you have installed at once, the cheaper the cost per unit becomes.

  • +
    Can I just replace the glass in my windows?

    Yes, it is possible to replace a fully double glazed unit into an existing frame.

    However, if your frames are anything more than a few years old, it is far better and more cost-effective on a long-term basis to replace the full window frame.

    It's not always possible to get a perfect install with a new glazed unit in a uPVC or aluminium frame. There might be slight damage to the frame.

    Timber frames are easier to re-fit and can be repainted. As timber last longer, you would be more likely to re-fit new glass units in timber frames if the frame was still robust and not warped.

Everest Customer Reviews

Start Your Project Today...

Book your free quotation appointment with one of our local expert consultants who will:

  • Provide an accurate, no-obligation quote
  • Offer ideas and practical solutions
  • Show you samples of our products
  • Take all necessary measurements

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