Looking to upgrade your home with energy-efficient and low-maintenance windows? uPVC (Unplasticised Polyvinyl Chloride) double glazed windows are a durable and cost-effective solution. Known for their excellent insulation and weather resistance, these windows help keep your home warmer in winter and cooler in summer, reducing reliance on heating and cooling systems.
In this comprehensive uPVC guide, you’ll discover the key benefits of uPVC double glazed windows, the types available, average costs, and what to consider before window installation to ensure optimal performance and long-term value.
What are uPVC Double Glazed Windows?
A uPVC double glazed window combines a frame made from Unplasticised Polyvinyl Chloride (uPVC)—a durable, rigid thermoplastic resistant to corrosion—with two panes of glass separated by an insulating gap. This design significantly reduces heat loss, improves thermal insulation, and boosts energy efficiency.
Compared to traditional wooden frames, uPVC frames are lighter and thinner, allowing more glass area per window unit. This increased glass area lets in more natural light, enhancing interior brightness while maintaining excellent insulation properties.
An upgrade to this is triple glazing, which includes three glass panes with insulating spaces, offering superior thermal performance and noise reduction compared to standard double glazed units.
Environmentally, modern uPVC windows are energy efficient due to their low thermal conductivity and can be recycled, reducing environmental impact compared to timber frames. The combination of uPVC frames and glazing reduces reliance on heating systems, cutting energy costs.
Additionally, white uPVC remains a popular choice for frames due to its classic look and ease of matching with many home styles. Complementing these are uPVC window sills, which provide durable protection and enhance the overall aesthetics of the window unit.
Furthermore, uPVC windows require minimal maintenance—resisting rot, rust, and warping—making them a practical long-term choice for homeowners.
For further details, explore our comprehensive overview of modern uPVC windows designs, including options for white uPVC frames and durable uPVC window sills that enhance both aesthetics and protection.
What Kind Of uPVC Double Glazed Windows Would Best Fit My Needs?
Choosing the right uPVC window depends on your budget, the architectural style of your home, and your practical needs. Here are some common types of uPVC double glazed windows and their ideal applications:
Casement Windows: The most popular window type in the UK, casement windows can open from the left, right, or top, providing excellent ventilation and ease of use. Their versatility, combined with durable uPVC frames, makes them a practical and attractive choice for most homes. These are also available in triple glazing units for superior thermal performance.
Sash Windows: Ideal for period or traditional properties, sash windows feature two panels that slide vertically over one another. For a classic look with modern performance, consider installing a uPVC sash window, which replicates the traditional timber sash style but with improved insulation and durability. You can also opt for sliding sash designs, perfect for maintaining heritage aesthetics while benefiting from low-maintenance white uPVC materials.
Bay Windows: Bay windows extend outward from the building, adding floor space and letting in more natural light. Commonly seen in Victorian and Edwardian homes, bay windows are now popular in new builds as well—sometimes requiring planning permission. When built with modern uPVC windows, they offer both elegance and high energy efficiency.
Rooflight and Skylight Windows: These roof-mounted windows are designed to bring light into attic or loft areas. Dormer windows, another roof extension option, add vertical space as well as daylight, making them ideal for converted lofts and top-floor rooms. Opting for triple glazing units in these installations helps regulate temperature and reduce noise from above.
Flush Sash and Flush Casement Windows: If you love a clean and simple look, flush sash or are a great choice—they sit neatly in line with your wall and give your home a modern, streamlined feel.
Understanding these styles and how they align with your property’s architecture and functional goals will help you choose the best modern uPVC windows to enhance your home’s comfort, energy efficiency, and curb appeal.
Costs of uPVC Double Glazed Windows
The cost of uPVC double glazed windows varies depending on several factors, including property size, window type, glazing style, and installation complexity. On average, you can expect to pay between £350 and £500 per window, including installation.
Terminology-wise, these may also be referred to as PVC double glazed windows or even plastic double glazed windows, but the correct term is uPVC (unplasticised polyvinyl chloride), which is valued for its strength, insulation, and affordability.
💷 Average Cost Breakdown by Property Size
| Property Type | Estimated Number of Windows | Total Cost Range |
|---|---|---|
| Flat | 2 windows | £700 – £1,000 |
| Small House | 5 windows | £1,750 – £2,500 |
| Medium House | 10 windows | £3,500 – £5,000 |
| Large House | 15 windows | £5,250 – £7,500 |
If you’re unsure how much your specific project might cost, feel free to get in touch for a custom quote.
Advantages and Disadvantages of uPVC Double Glazed Windows
When considering uPVC double glazed windows, it’s important to understand both their strengths and potential limitations. This clear comparison will help you make an informed decision—especially if you’re wondering how long uPVC window frames last or are researching the disadvantages of uPVC windows in detail.
✅ Advantages
✔️ Durability
High-quality uPVC windows can last up to 20–25 years with minimal maintenance. They are resistant to rot, corrosion, and weathering, making them ideal for UK climates.
✔️ Energy Efficiency
Double glazing combined with uPVC frames provides excellent thermal insulation. These windows trap heat inside during winter and reflect solar gain during summer, helping to reduce heating and cooling bills.
✔️ Noise Reduction
The dual-pane design helps cut down on outside noise—ideal for homes near busy roads or urban areas.
✔️ Security
Modern uPVC windows often include reinforced steel cores, multi-point locking systems, and internal glazing beads, making them difficult to tamper with or force open.
✔️ Fire Resistance
uPVC is self-extinguishing and doesn’t sustain combustion, offering added safety during fire incidents.
✔️ Low Maintenance
No painting, sanding, or sealing required. A simple wipe-down keeps them looking new.
❌ Disadvantages
⚠️ Limited Design Flexibility
Compared to timber or aluminium windows, uPVC options offer fewer customisation choices in terms of finishes, colors, and textures—though this is improving with woodgrain foils and custom RAL colours.
⚠️ Potential for Frame Sagging
Older or poorly reinforced uPVC frames may sag over time, especially in larger openings. This is usually preventable with internal galvanised steel reinforcements.
⚠️ Not Suitable for Heritage Conservation Areas
In some conservation zones, timber-framed windows are required due to planning restrictions.
✅ Tip: Choose high-quality profiles from trusted manufacturers and certified installers to mitigate most of the disadvantages listed above.
Advantages of Choosing Bowland Windows for Boarding Up Services
When your windows are broken due to break-ins, storm damage, or accidental impact, fast action is crucial. Bowland Windows offers emergency boarding up and window repair services designed to restore your home’s security, insulation, and weather protection without delay.
✅ What Sets Our Boarding Up Services Apart?
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Rapid Response Time: Our team is available 24/7 for urgent call-outs across [region or service area].
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Heavy-Duty Materials: We use reinforced timber panels and secure fixings to protect your property until permanent glazing can be installed.
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Minimal Disruption: Boarding is done professionally and discreetly to avoid damage to existing frames or structures.
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Insurance Compliance: We follow insurer-approved protocols, helping you avoid claim disputes during property damage events.
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Follow-Up Solutions: Once the property is secured, we can also quote for replacement uPVC double glazed windows or glass-only repairs if needed.
✅ Whether it’s a smashed pane from vandalism or storm debris, we ensure your home is protected and safe — fast.
Is uPVC Double Glazing the Right Choice for Your Home?
If you’re looking to improve comfort, reduce energy bills, and boost your home’s long-term value, uPVC double glazed windows are a smart and cost-effective solution.
Here’s when choosing uPVC makes the most sense:
✅ Ideal for:
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Homeowners replacing outdated timber or aluminium frames
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New builds needing modern, low-maintenance glazing
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Landlords or property managers seeking long-term durability
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Energy-conscious buyers aiming to cut heating bills
🔍 Why It’s a Smart Investment:
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Thermal Efficiency: Helps retain indoor heat during winter and blocks excess heat in summer—resulting in consistent comfort year-round.
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Low Maintenance: No sanding, painting, or warping—uPVC frames are weather-resistant and built to last.
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Eco-Friendly: uPVC is recyclable and a poor thermal conductor, making it an environmentally responsible choice.
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Fire Resistance: The material is self-extinguishing, adding a layer of passive fire safety.
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Health & Air Quality: Consider installing a trickle vent to maintain indoor ventilation without compromising insulation.
Verdict:
Whether you’re renovating or planning new installations, uPVC double glazing offers the perfect mix of performance, safety, and long-term savings.
Final Thoughts: Is uPVC Double Glazing Right for You?
uPVC double glazed windows are a smart, long-term investment for any property. Offering excellent thermal insulation, durability, and low maintenance, they’re ideal for homeowners looking to reduce heating bills and enhance everyday comfort.
✅ Versatile Styles
Whether you prefer sliding sash, flush casement, or bay windows, there’s a uPVC style to suit every architectural design—from modern flats to period homes.
💷 Estimated Costs
Installation costs typically range from £1,700 to £10,000, depending on the size and number of windows. These costs are often recovered through energy savings and low upkeep, especially when combined with timely window replacement if needed.
🔧 Lifespan & Maintenance
While most double glazing lasts 20+ years, it’s important to monitor for signs of double glazing failure. These may include draughts, reduced energy efficiency, or condensation between the panes. If you’re wondering how long double glazing should last before misting, the answer is generally two decades—but premature misting can occur due to poor installation or seal breakdown.
🔥 Fire Safety & Air Quality
uPVC frames are fire-retardant and can be paired with trickle vents to maintain healthy indoor airflow—supporting both safety and comfort throughout the year.
Get In Touch With Us Now:
Still unsure? Get a free quote from the Bowland Windows team. We’ll help you find the perfect match for your home and budget.
FAQs
Q: What are the benefits of uPVC double glazing windows?
A: uPVC double glazing windows improve energy efficiency, reduce external noise, enhance security, and require very little maintenance—making them a popular and long-lasting window choice.
Q: Are PVCu double glazing windows better than traditional windows?
A: Yes, PVCu double glazing offers superior thermal insulation, is weather-resistant, and is more cost-effective over time compared to timber or aluminium options.
Q: Are uPVC windows fire resistant?
uPVC windows are fire retardant and self-extinguishing, but not fully fireproof.
Q: Are uPVC windows double glazed?
Yes, most uPVC windows are double glazed by default, offering better insulation and energy efficiency.
Q: How long do upvc window frames last?
uPVC window frames typically last 20–25 years with proper care, offering long-term durability, weather resistance, and minimal maintenance requirements.
Q: How long should double glazing last before misting?
Quality double glazing should last 15–20 years before misting occurs. Misting often signals seal failure, which may require unit replacement to restore insulation performance.
