Your Guide to Composite Windows

Written by  John Davies
Last updated: August 8, 2023

Composite windows are quickly making a name for themselves in the window market in the UK. They offer all the benefits of wooden windows without the high maintenance costs associated with them in long-term installations. In this guide to composite windows, we’ll look at the benefits of having them installed in your home and provide a broad costing outline to give you an idea of pricing for composite windows. 

What are composite windows? 

Compost windows are a relatively new design of window frames. They allow homeowners to enjoy the look of wooden window frames on the inside of their homes, without worrying too much about intense upkeep and maintenance on the outside. Composite window frames are made from a wooden base material which is exposed on the interior. However, they are clad with aluminium on the outside, thereby protecting them from external damage. 

This additional protection adds durability to the windows, meaning you won’t have to spend as much time and money on maintaining them. Composite windows actually have a longer lifespan than other materials like uPVC. Whereas uPVC window frames have an approximate lifespan of 25-35 years, composite windows will last around 40 years, making them the ideal material to use for permanent builds. 

What are the benefits of composite windows? 

Composite material is increasing in popularity because of all the benefits associated with incorporating the materials into your home. Below we’ve listed just a few of the benefits you can enjoy when you choose to install composite windows. 


Unlike windows with wooden or timber frames, composite windows are a lot more durable owing to the aluminium cladding placed on the outside of the property. Their long lifespan also makes them ideal for long-term design investments as they are less likely to become damaged by external factors such as extreme weather or impact. 

Interior design appeal

Many interior designers and homeowners enjoy the look that wooden or timber windows provide but are often tempted to go with other materials for the sake of durability and less maintenance. With composite windows, you can still have the same interior look that timber windows provide which is wonderful for the likes of farmhouse-style kitchens and dining areas. This look also adds a cosy aspect to bedrooms and lounges. 

Improved insulation

Another reason timber windows are so popular is because of their superior insulative qualities. Composite windows provide the same insulation on the inside as wooden windows so that our home can stay warm and cosy during wintertime. With the heat-conducting aspects of the aluminium cladding, homes can stay even warmer as they draw warmth from the outside of the house as the sun shines on the frame. 

Low maintenance

Purely wooden windows are susceptible to damage and require regular painting to ensure they stay in good condition. However, with composite windows, the outside of the frame is protected with aluminium cladding, which acts as a shield against factors that could damage the outside of the window frame. This increases composite window frame’s lifespan to around 40 years as opposed to the normal estimated lifespan of 25 – 35 years. 

How much do composite windows cost? 

As with any type of window and window frame material the overall cost of a window installation project depends on several factors which we have listed below. As far as overall average costs go, you’re probably looking at around £1500 – £2000 per window. This mean to fully deck out an entire house would cost in the regions of £10,000 – £25,000.

Composite windows are on the upper end of the pricing spectrum, given that they use two of the most expensive materials on the market. Timber is a high-cost option for window frames and the additional aluminium cladding adds costs to these too. For this reason, you can expect to pay more for composite windows. However, your long-term savings justify the upfront costs. 


Costs will also go up according to the design options you select. Window designs such as sash windows and bay windows with composite frames will usually be more expensive than the standard casement window design. It’s also possible to have composite frames on other designs like tilt-and-turn windows, which will cost more than casement designs but will come out cheaper than sash or bay windows. 


Installation costs will also be a factor, but a good contractor will break down the installation costs for you in a comprehensive quote. The location of the project will increase the costs depending on how remote the project site is. Other aspects include the size of the windows as well as specific requirements for installation such as on which floor the windows need to be placed. Other contractors may charge you delivery and courier fees if these fall within the scope of their service. 


Custom shapes and designs of composite window frames will also impact the cost of a composite window. Everyone loves to add their own unique twist to the look of their home but doing so comes at a cost. If you have the money to spend on customised composite windows, they can look great and will certainly make a design statement. However, for projects on more of a budget, standard designs are the best way forward. 


Why are composite windows so expensive? 

Composite windows are made up of two of the most expensive materials for window frames. These two are prominently timber and aluminium. Although other materials such as uPVC will cost less upfront, it’s estimated that composite windows will end up being around 23 – 35% cheaper over 60 years. This definitely makes composite windows a fantastic long-term investment. 

Are composite windows worth it? 

Composite windows add a lot of value to the property given their long lifespans. They, therefore, make it a worthwhile investment when you choose composite materials as the frame for your windows. Given their low-maintenance, high-quality properties, they will also increase the overall property value, with modern house-hunters seeking homes that won’t take time and effort for upkeep and renovation. Homes with composite windows are often built into properties that are ready for immediate occupancy. They will also save property investors money in the long run, with window care costs kept to a minimum. 

Are composite or uPVC windows better? 

Both uPVC and composite windows are attractive to buyers given their low-maintenance nature. If you are on a tight budget for upfront costs, uPVC window frames may be the best way to go. However, if you can spare the cash and are looking to invest in your property, composite windows will last longer and ultimately save you time and money. 

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