Replacing your windows is an important home improvement decision. The right replacement windows can improve your home’s appearance, thermal efficiency, security, ventilation and comfort while helping reduce heat loss.
But with so many options available, choosing the right windows can be difficult. Should you choose uPVC or aluminium windows? Is double glazing enough, or should you consider triple glazing? Which window style works best for your property? And how much should replacement windows cost?
In this guide, Glitz Windows & Doors explains the key factors to consider when choosing replacement windows in the UK, including window materials, glazing, styles, energy efficiency, security and installation.
If you live in Coulsdon, Croydon, Sutton, Caterham, Epsom, Crawley or the surrounding South London and Surrey areas, Glitz Windows can provide a free, no-obligation survey and tailored replacement window quote.
When Should You Replace Your Windows?
Not every old window needs to be replaced immediately. In some cases, a repair or replacement glass unit may be sufficient. However, there are several signs that your windows may have reached the end of their useful life.
You may want to consider window replacement if you notice:
- Draughts around the window frames
- Condensation or misting between glass panes
- Cracked or damaged glass
- Windows that are difficult to open or close
- Damaged or deteriorating frames
- Poor insulation
- Excessive outside noise
- Increasing heating costs
- Outdated or insecure locking systems
- Windows that no longer complement the appearance of your home
Misted double glazing does not necessarily mean the entire window needs replacing. Depending on the condition of the frame, replacing the sealed glass unit may be an appropriate solution.
A professional inspection can help determine whether you need a window repair, replacement glass unit or complete replacement window.
What Types of Replacement Windows Are Available?
There is no single window style that is right for every property. Your choice should take into account your home’s architecture, available space, ventilation requirements, budget and preferred appearance.
Some of the most popular replacement window options include:
uPVC Replacement Windows
uPVC windows remain a popular choice for UK homeowners because they combine durability, low maintenance and thermal performance.
Modern uPVC windows are available in a variety of styles, colours and finishes, making them suitable for both traditional and contemporary properties.
Benefits can include:
- Low maintenance
- Good thermal insulation
- Weather resistance
- Durable construction
- A wide choice of styles and finishes
- Modern security features
- Competitive installation costs
Glitz Windows supplies and installs made-to-measure uPVC windows designed around the requirements of individual properties.
Aluminium Replacement Windows
Aluminium windows are particularly suitable for homeowners looking for a contemporary appearance and slim sightlines.
Aluminium is strong and allows manufacturers to create narrow frames while maintaining structural strength. This can provide larger areas of glass and increased natural light.
Aluminium replacement windows can be particularly suitable for:
- Modern homes
- Large window openings
- Extensions
- Contemporary renovations
- Properties where slim sightlines are important
Glitz Windows offers both uPVC and aluminium window solutions across South London and Surrey.
Casement Windows
Casement windows are one of the most versatile window styles available. They are hinged and can be configured to open from the side or top depending on the design.
They are suitable for many rooms and property styles and can provide effective ventilation when correctly specified.
Modern casement windows can also incorporate multi-point locking systems and energy-efficient glazing. Glitz Windows provides uPVC, aluminium and timber casement window options.
Sash Windows
For traditional and period properties, replacement sash windows can help preserve the character of the building while providing modern glazing and insulation.
Depending on the property and design requirements, sash windows can be manufactured with modern materials and glazing technology while maintaining a traditional appearance.
Bay and Bow Windows
If you want to increase natural light or create additional visual space, bay and bow windows can be another option.
They can provide wider views and add architectural character to a property. However, their installation requirements can differ from those of standard flat windows, so professional surveying is particularly important.
Double Glazing or Triple Glazing?
The glazing specification is another important consideration when choosing replacement windows.
Double glazing consists of two panes of glass separated by a sealed cavity, commonly containing an insulating gas such as argon. This creates a thermal and acoustic barrier between the interior and exterior of your home.
Modern double glazing can provide:
- Better thermal insulation
- Reduced heat loss
- Improved comfort
- Reduced external noise
- Enhanced security
- Lower maintenance compared with older window systems
Triple glazing adds a third pane of glass and can provide additional thermal and acoustic performance. However, it is not automatically the best choice for every property.
The appropriate glazing specification depends on your property’s construction, orientation, existing windows, budget and performance requirements.
Rather than choosing based solely on the number of panes, consider the complete window system, including the frame, glass specification, spacer bars, seals and installation quality.
What Makes a Window Energy Efficient?
Energy efficiency is one of the biggest reasons homeowners consider replacing old windows.
Older or poorly performing windows can allow heat to escape, making rooms feel colder and potentially increasing the amount of energy required to heat the property.
When comparing energy-efficient replacement windows, look at factors such as:
Window Energy Rating
Window Energy Ratings (WERs) provide a way of comparing the energy performance of windows.
Glitz Windows supplies A-rated energy-efficient glazing options designed to help reduce heat loss.
Low-E Glass
Low-emissivity, or Low-E, glass has a special coating designed to reduce heat transfer through the glazing.
Insulated Frames
The frame is also important. A high-performance glass unit cannot deliver its full potential if the surrounding frame has poor thermal performance.
Gas-Filled Units
Modern double-glazed units can use an insulating gas such as argon between the panes to reduce heat transfer.
Professional Installation
Even a high-quality window can perform poorly if it is incorrectly installed.
Proper measurements, suitable sealing and professional installation all contribute to the overall performance of replacement windows.
uPVC vs Aluminium Windows: Which Should You Choose?
There is no universal answer because both materials have different characteristics.
| Feature | uPVC Windows | Aluminium Windows |
| Maintenance | Low | Low |
| Appearance | Versatile | Modern and slim |
| Strength | Excellent | Very high |
| Thermal performance | Excellent with modern systems | Excellent with thermal-break systems |
| Design options | Wide range | Wide range |
| Large openings | Suitable | Particularly suitable |
| Typical cost | Often more affordable | Generally higher |
For homeowners looking for a practical and cost-effective replacement window solution, uPVC can be an excellent option.
For homeowners prioritising slim frames, large glass areas and a contemporary appearance, aluminium may be more suitable.
The best choice ultimately depends on the property and your requirements.
How Much Do Replacement Windows Cost in the UK?
The cost of replacement windows varies considerably from one property to another.
Factors affecting the price include:
- Number of windows
- Window dimensions
- Window style
- Frame material
- Double or triple glazing
- Glass specification
- Colour and finish
- Bespoke designs
- Accessibility
- Installation requirements
- Any structural alterations required
For example, a standard uPVC casement window will generally have a different price from a large aluminium window, bay window or bespoke sash window.
Glitz Windows currently publishes guide pricing for standard window installations, but an accurate price requires the property’s measurements and specification to be assessed.
For this reason, getting a free, no-obligation window survey and written quotation is usually more useful than relying on a generic online price.
Should You Repair or Replace Your Windows?
Replacing every window is not always necessary.
If the existing frame is structurally sound but the sealed glass unit has failed, a replacement glass unit may be sufficient.
However, a complete replacement window may make more sense where:
- The frame is damaged
- The window is badly draughty
- Security is outdated
- The mechanism is failing
- The frame has deteriorated
- Thermal performance is poor
- The window design is no longer suitable for the property
Glitz Windows provides both double glazing repairs and complete window installations, allowing homeowners to discuss the appropriate solution before committing to a replacement.
What Should You Look for in a Window Installer?
Choosing the right installer is just as important as choosing the right windows. Before booking, check:
- FENSA registration – Ensures relevant installations meet building regulations.
- Experience – Choose an installer experienced with your window type and property.
- Guarantee – Check what the product and installation guarantee covers.
- Written quotation – Make sure costs, glazing and installation are clearly explained.
- Professional survey – Accurate measurements help ensure a correct fit.
- Aftercare – Check what support is available after installation.
Glitz Windows is FENSA registered, has 25+ years of experience, and offers a 10-year guarantee on qualifying installations, with free, no-obligation surveys available.
Replacement Windows in Coulsdon, Croydon and Surrey
Looking for replacement windows in Coulsdon? Glitz Windows & Doors provides uPVC and aluminium windows, double glazing and doors across Coulsdon, Croydon, Sutton, Caterham, Epsom, Crawley and surrounding South London and Surrey areas.
Whether you need one replacement window or a complete upgrade, a professional survey can help you choose the right solution for your property.
Choose the Right Replacement Windows for Your Home
The right replacement windows should do more than improve the appearance of your property. They should provide the combination of thermal performance, security, ventilation, durability and design that suits your home.
Start by assessing thAssess your existing windows, compare materials and glazing options, and choose an experienced installer. Glitz Windows & Doors offers replacement windows across Coulsdon, Croydon, Sutton and Surrey, backed by 25+ years of experience, FENSA registration and a 10-year guarantee on qualifying installations.
Contact Glitz Windows for a free, no-obligation survey
