Sash windows, with their timeless charm and architectural versatility, can enhance almost any home, from period properties to contemporary designs. Over 90% of period homes in the UK originally featured sash windows, cementing their legacy as a hallmark of British architectural heritage. Today, modern sash windows—crafted in timber, aluminium, or energy-efficient uPVC—offer a fusion of classic aesthetics and cutting-edge functionality, making them suitable for a variety of homes.
What Sets Sash Windows Apart?
Sash windows differ from casement or sliding windows in their unique vertical or horizontal sliding mechanism, creating a seamless, unobstructed appearance. This classic design not only elevates the character of a property but also provides superior ventilation control compared to other window types.
Why Choose Sash Windows?
- Aesthetic Appeal: Ideal for maintaining the character of period homes while seamlessly blending into modern builds.
- Energy Efficiency: Modern sash windows can achieve A+ ratings, matching or surpassing the thermal performance of other window types.
- Increased Property Value: Their timeless style enhances curb appeal, potentially increasing your home’s market value.
- Durability & Customisation: Available in durable materials like uPVC or timber, with design options tailored to your preferences.
Transform Your Home with Sash Windows
Whether you live in a Victorian townhouse, a Georgian property, or a modern suburban home, sash windows can be tailored to complement your architectural style. Many homeowners worry about retrofitting these windows into newer builds, but advanced designs allow for seamless integration without compromising energy efficiency or security.
Quick and Easy Installation Process
Scheduling an initial consultation is fast and hassle-free—most appointments can be arranged within a week. Our expert team will assess your property and guide you through every step, from design selection to installation.
Key Benefits at a Glance:
- Heritage Appeal: Maintain the character of period properties.
- Modern Innovation: Enjoy the benefits of energy-efficient glass and eco-friendly materials.
- Customisable Design: Choose from various frame materials, glazing styles, and finishes.
- Enhanced Security: Secure locking mechanisms for peace of mind.
“Our new sash windows blend the old-world charm we wanted with modern energy efficiency. The team was fantastic from start to finish!”
– Anna M., London
With over 20 years of expertise and a track record as London’s #1 sash window specialists, we’re here to help you achieve the perfect balance of beauty, functionality, and energy efficiency.
Ready to transform your home?
Why Sash Windows Remain a Popular Choice Across Home Styles
Sash windows have stood the test of time, remaining an iconic feature of British architecture since their invention in the 17th century. Widely embraced during the Georgian and Victorian eras, these windows became a defining element of period homes, with approximately 75% of listed buildings in the UK still featuring them today. Their enduring appeal lies in their ability to merge historic character with modern functionality, making them a versatile choice for both period and contemporary homes.
The Timeless Versatility of Sash Windows
Sash windows offer unmatched architectural flexibility, seamlessly integrating into various home styles:
- Period Homes: Retain the historic charm and authenticity of Georgian, Victorian, or Edwardian properties.
- Modern Builds: Create a striking visual contrast by blending traditional designs with sleek, contemporary architecture.
For homeowners seeking a balance between heritage aesthetics and modern practicality, sash windows deliver a customisable solution. From frame materials like timber or uPVC to glazing styles and finishes, they can be tailored to your exact specifications.
The Advantages of Sash Windows
Energy Efficiency
Modern sash windows boast energy ratings of up to A+, rivalling or exceeding other window types. Advanced glazing and draught-proofing technologies keep homes warmer in winter and cooler in summer, reducing energy bills without compromising style.
Enhanced Indoor Ventilation
Sash windows provide excellent ventilation with their unique sliding mechanism, allowing warm air to escape through the top while drawing in cooler air from below. This design naturally regulates airflow, contributing to a healthier indoor environment.
Boosting Property Value
The aesthetic and functional benefits of sash windows are well-documented. Their historic significance appeals to buyers of period properties, while modern sash designs increase the appeal of newer builds. Installing high-quality sash windows can significantly enhance your property’s value and curb appeal.
A Comparison: Sash vs Other Window Types
| Feature | Sash Windows | Casement Windows | Sliding Windows |
| Aesthetic Appeal | Timeless, versatile | Simple, functional | Contemporary, minimalistic |
| Energy Efficiency | A+ rated available | A to A+ ratings available | Moderately efficient |
| Ventilation | Superior airflow control | Limited to hinged openings | Partial airflow control |
| Customisation | High (materials, glazing, etc.) | Moderate | Limited |
Whether your goal is to preserve the character of a historic property or introduce elegance to a modern home, sash windows offer a winning combination of tradition and innovation.
How to Know if Sash Windows Are Suitable for Your Property
Sash windows are renowned for their ability to blend seamlessly into various architectural styles, whether you’re upgrading a modern home or restoring a historic property. However, determining their compatibility requires careful evaluation of several factors, including frame condition, structural features, and regulatory requirements.
Key Factors for Compatibility
1. Assessing Your Home’s Architecture
Sash windows are highly versatile and can complement both period and contemporary homes.
- Period Homes: Their timeless design makes sash windows ideal for Georgian, Victorian, or Edwardian houses.
- Modern Homes: Customisation options, such as uPVC frames and sleek glazing designs, allow sash windows to integrate effortlessly into modern builds, adding a touch of elegance.
2. Frame and Structural Considerations
Before installation, existing frames and structural features must be assessed:
- Frame Condition: Ensure the frames are in good condition or can accommodate replacements. Rotten timber or structural gaps may require repair or bespoke adjustments.
- Small Openings or Unusual Shapes: Modern sash windows can be tailored to fit non-standard dimensions, making them suitable for unique layouts.
3. Conservation and Listed Building Regulations
Homes in conservation areas or listed as historically significant often have restrictions on window alterations. The UK Planning Portal highlights that sash windows are frequently required in such areas to maintain architectural authenticity. Fortunately, modern designs meet these regulations while offering energy-efficient solutions.
Customisation Options for Any Home
Modern sash windows can be fully customised to match your property’s requirements:
- Frame Materials: Choose from traditional timber or low-maintenance uPVC.
- Glazing: Options include double or triple glazing for improved energy efficiency.
- Finishes: A wide range of colours and finishes ensures sash windows complement any aesthetic.
Addressing Common Challenges
For properties with unique layouts or older structures, sash windows provide innovative solutions:
- Small Openings: Slim-profile designs can optimise light without sacrificing style.
- Non-Standard Frames: Bespoke manufacturing ensures a perfect fit.
- Ventilation Needs: Their unique sliding mechanism facilitates superior airflow in any setting.
Meeting Modern and Historic Needs
Whether installed in new builds or historic properties, sash windows enhance both functionality and aesthetics. Their ability to improve ventilation, meet regulatory standards, and adapt to diverse styles makes them a timeless and practical choice for homeowners.
Key Considerations for Successful Sash Window Installation
Installing sash windows requires careful planning to ensure they complement your home’s style, meet practical needs, and adhere to regulations. From selecting materials to understanding planning permissions, these factors will guide you through a seamless installation process.
1. Permissions and Legal Requirements
If your property is listed or located in a conservation area, planning permission is often required. According to the UK Planning Portal, sash windows are frequently mandated in these settings to preserve historical integrity. Modern sash windows, crafted from timber or uPVC, can replicate traditional aesthetics while complying with regulations.
2. Choosing the Right Material
The choice of material greatly impacts cost, aesthetics, and longevity:
- Timber Sash Windows: Timeless and authentic, ideal for period properties. However, they require regular maintenance and are more expensive.
- uPVC Sash Windows: Affordable and low-maintenance, costing 30–50% less than timber. These provide excellent insulation while maintaining a traditional appearance.
- Aluminium Sash Windows: Sleek, durable, and perfect for contemporary homes. They are typically higher in cost but offer exceptional strength and modern design.
3. Energy Efficiency and Glazing Options
Investing in double or triple-glazing can reduce heat loss by up to 40%, as shown in studies by the Energy Saving Trust. Modern glazing also reduces noise, enhancing home comfort in urban areas.
4. Practical Installation Tips
- Frame Measurement: Accurate measurements are essential to avoid costly errors. A professional installer will assess your frame’s condition and dimensions before ordering.
- Customisation for Unique Frames: Non-standard openings can be addressed with bespoke sash designs.
5. Selecting a Reliable Installer
Choosing the right installer is critical for long-term satisfaction:
- Look for accreditation or membership in trade organisations like FENSA or CERTASS.
- Obtain multiple quotes to compare costs and ensure quality workmanship.
- Read reviews and ask for references to verify the installer’s expertise.
Minimising Disruption During Installation
Most professional installations are completed within a day per window. Installers take steps to minimise disruption, using dust sheets and cleaning as they work. By planning ahead, your home can remain functional throughout the process.
Sash windows, whether timber, uPVC, or aluminium, balance timeless design with modern functionality, ensuring energy efficiency and aesthetic value for any home.
Explore Sash Window Styles and Features
Sash windows combine timeless charm with modern functionality, offering versatile design options for any home. Whether you’re restoring a period property or enhancing a contemporary space, there’s a sash window style to suit your needs.
1. Types of Sash Windows
Sash windows come in three main varieties, each with unique benefits:
- Single-Hung Sash Windows: One movable sash and one fixed sash. These are cost-effective and ideal for traditional aesthetics.
- Double-Hung Sash Windows: Both sashes move independently, providing improved ventilation and easier cleaning.
- Sliding Sash Windows: Designed for modern homes, these glide horizontally, offering a sleek look and practical functionality in smaller spaces.
2. Customisation Options
Tailor sash windows to match your home’s aesthetic and performance requirements with features such as:
- Glazing Options: Acoustic or security glazing can reduce noise by up to 70% and enhance safety.
- Hardware and Finishes: Choose from brass, chrome, or matte black handles to complement your interior.
- Period-Specific Details: Georgian bars or Victorian-style horns add character to heritage properties.
- Colours and Frames: From traditional white to contemporary anthracite grey, sash windows can be customised to match any design scheme.
3. Modern Upgrades for Timeless Appeal
While sash windows retain their historical charm, advancements in technology make them more efficient and user-friendly:
- Tilt-and-Clean Mechanisms: Simplify maintenance, especially in hard-to-reach areas.
- Energy Efficiency Enhancements: Double or triple glazing and insulated frames help minimise heat loss, lowering energy bills.
- Enhanced Security: Reinforced frames, key-operated locks, and toughened glazing ensure peace of mind without sacrificing style.
4. Balancing Style, Efficiency, and Cost
Selecting the right sash window depends on your priorities:
- For authenticity, timber sash windows are unmatched but come with higher costs and maintenance.
- uPVC options offer a budget-friendly alternative with excellent insulation and low upkeep.
- Aluminium frames provide modern durability and a minimalist look, ideal for contemporary homes.
Sash windows effortlessly merge period elegance with cutting-edge technology, making them a standout choice for any property.
Advantages of Sash Windows for All Property Styles
Sash windows are a timeless choice, seamlessly blending historical elegance with modern practicality. Their versatility ensures they enhance both period and contemporary homes while delivering tangible benefits in aesthetics, energy efficiency, and property value.
1. Visual Appeal and Versatility
- For period properties, sash windows preserve architectural integrity. Features like Georgian bars and Victorian detailing complement the heritage aesthetic, as noted by Historic England, which highlights a 20% property value increase when retaining period-specific features.
- In modern builds, custom sash windows offer clean lines and contemporary finishes, striking a balance between traditional charm and modern minimalism.
2. Energy Efficiency and Cost Savings
Modern sash windows incorporate cutting-edge technology:
- Double-Glazing: Achieving energy ratings comparable to A-rated casement windows, they reduce heat loss by up to 40%, helping to lower utility bills.
- Insulated Frames: Timber, uPVC, and aluminium options are designed to prevent draughts and improve thermal performance.
- Noise Reduction: Acoustic glazing cuts external noise by up to 70%, ideal for urban homes.
3. Superior Ventilation
Sash windows provide exceptional ventilation with their unique design. The ability to open the top and bottom sashes simultaneously creates a natural cooling effect known as the “stack effect”, improving airflow while maintaining security.
4. Curb Appeal and Property Value
Whether you’re refurbishing a Victorian terrace or upgrading a new-build, sash windows elevate curb appeal, a key factor in boosting resale value. Their blend of beauty and functionality makes them a smart long-term investment.
Sash windows prove that preserving tradition doesn’t mean compromising on innovation, offering a perfect synergy of historical charm and modern functionality.
Debunking Misconceptions About Sash Windows
Modern sash windows are far from outdated. With advancements in materials, design, and functionality, they blend timeless charm with cutting-edge technology. Let’s tackle some of the most persistent myths surrounding sash windows.
1. “Sash Windows Are Old-Fashioned”
While sash windows are iconic in period homes, they’re equally at home in modern builds. Thanks to customisation options, such as sleek uPVC frames and minimalist finishes, sash windows can align with any architectural style. The versatility of these windows ensures they never go out of style, offering both heritage and contemporary appeal.
2. “Sash Windows Are Inefficient”
Modern sash windows rival other window types in energy performance.
- Double-Glazing: High-quality glazing options can achieve energy ratings comparable to A-rated casement windows, significantly reducing heat loss.
- Insulation: Materials like uPVC and aluminium frames minimise draughts while maintaining a traditional look.
3. “Sash Windows Require Too Much Maintenance”
The introduction of low-maintenance materials has transformed upkeep requirements:
- uPVC Sash Windows: Last 20-25 years with minimal cleaning and no repainting.
- Tilt-and-Slide Mechanisms: Allow easy access for cleaning, even in upper-storey windows.
4. “Sash Windows Are Less Secure”
Security concerns are outdated. Modern sash windows incorporate advanced locking systems, many of which are Secured by Design-certified, providing robust protection against intrusions. Optional security glazing further enhances peace of mind.
Conclusion: Innovation Meets Tradition
Modern sash windows seamlessly combine tradition with functionality, offering homeowners a stylish, efficient, and secure choice for both period and contemporary properties.
Understanding Rules and Regulations for Sash Window Installation
1. Do I Need Planning Permission to Replace Sash Windows in a Conservation Area?
In conservation areas, sash window replacements often require planning permission. Local authorities aim to preserve the area’s architectural character, and modifications must align with these standards. According to Historic England, retrofitting modern double-glazing into existing sash frames is a popular solution. This approach improves energy efficiency while maintaining the heritage appearance, thus simplifying the approval process.
2. Are There Specific Rules for Installing Sash Windows in Listed Buildings?
Listed buildings have stricter regulations. Any changes to their appearance, including windows, must receive Listed Building Consent.
- Material Restrictions: Replacing original timber sash windows with uPVC may be prohibited; restoration using similar materials is preferred.
- Design Considerations: New windows must replicate historical features like Georgian bars or Victorian detailing.
- Approval Tip: Always consult your local planning authority or a heritage specialist before starting work.
3. How Do I Ensure My Sash Windows Meet Building Regulations?
Building regulations focus on safety, thermal performance, and accessibility. Modern sash windows are designed to comply with these standards:
- Thermal Efficiency: Double-glazed sash windows meet Part L requirements, reducing heat loss by up to 40%.
- Safety: Toughened glass and advanced locking systems enhance security.
- Ventilation: Compliance with Part F ensures adequate airflow in living spaces.
Navigating the Planning Process
- Step 1: Research your property’s classification (e.g., conservation area or listed building).
- Step 2: Consult your local planning authority to confirm specific requirements.
- Step 3: Submit detailed plans, including materials, designs, and compliance information.
- Step 4: Work with certified installers who understand both building regulations and heritage guidelines.
Balancing Heritage and Modern Needs
By combining period-appropriate designs with modern technology, sash windows can meet regulatory requirements while maintaining the charm and value of your property.
How Much Do Sash Windows Cost? A Comprehensive Guide
1. What Factors Influence the Cost of Sash Windows?
The cost of sash windows depends on several factors, including material, glazing, customisation, and installation complexity.
- Materials: uPVC sash windows are the most affordable, costing between £700–£1,200 per unit, while timber sash windows range from £1,000–£1,800 per unit. Aluminium options typically fall between these ranges, offering a modern aesthetic and durability.
- Glazing Options: Double-glazing adds to the cost but delivers significant savings over time, cutting energy bills by up to 20%, according to the Energy Saving Trust. Acoustic or security glazing may increase upfront expenses but offers better noise reduction and enhanced security.
- Customisation: Period detailing, such as Georgian bars or bespoke finishes, can elevate costs but enhance the authenticity and visual appeal of the windows.
2. Are Timber Sash Windows More Expensive than uPVC Alternatives?
Yes, timber sash windows are generally more expensive due to the craftsmanship and natural materials involved. However, they are ideal for conservation areas or listed buildings where authenticity is paramount. uPVC sash windows, while less costly, provide excellent value with minimal maintenance and modern designs that mimic traditional aesthetics.
3. Can Sash Windows Help Reduce Heating and Cooling Bills?
Absolutely. Modern double-glazed sash windows with A-rated energy efficiency can significantly lower heating and cooling costs by preventing draughts and retaining heat. Retrofitting double-glazing into existing frames is also an option for period homes, offering energy savings without compromising historical charm.
4. Tips for Budgeting and Maximising Value
- Compare Quotes: Obtain multiple quotes to ensure the best balance of quality and cost.
- Repair vs Replace: If the frames are in good condition, repairing existing sash windows can be more cost-effective.
- Financing Options: Look for grants or financing programmes for energy-efficient upgrades.
- Long-Term Value: While initial costs may seem steep, energy savings and increased property value make sash windows a worthwhile investment.
Balancing Budget and Quality
Investing in sash windows combines timeless design with energy efficiency, adding long-term value to your home while maintaining its aesthetic integrity.
How Sash Windows Contribute to a Greener Home
1. Energy Efficiency: A Core Advantage of Modern Sash Windows
Modern sash windows equipped with double-glazing can reduce energy loss by up to 65%, making them highly efficient compared to single-glazed options. Triple-glazing offers an even greater thermal barrier, further minimising heat transfer. Key innovations like Low-E (low emissivity) glass reflect heat back into your home while allowing natural light to penetrate, and warm-edge spacers between glass panes reduce cold bridging for optimal insulation.
These energy-saving features not only help maintain comfortable indoor temperatures but also lower heating and cooling costs, contributing to reduced carbon emissions and a smaller ecological footprint.
2. Eco-Friendly Materials and Sustainable Design
Sash windows are now crafted with sustainability in mind:
- Timber sash windows are a renewable option, sourced from sustainable forests and capable of lasting decades with proper care.
- uPVC sash windows, while synthetic, are 100% recyclable and designed for minimal maintenance, ensuring durability over a 20–25 year lifespan.
- Aluminium, another popular material, is lightweight, corrosion-resistant, and infinitely recyclable, making it an eco-conscious modern choice.
3. Upgrading Older Sash Windows for Better Sustainability
For period homes, retrofitting sash windows with double-glazing and draught-proofing systems can significantly improve energy efficiency without compromising heritage aesthetics. This not only enhances thermal performance but also reduces condensation and eliminates draughts.
4. Balancing Aesthetics with Environmental Impact
Modern sash windows deliver the best of both worlds: the timeless charm of traditional designs and cutting-edge energy efficiency. With features like Secured by Design-certified locking mechanisms and acoustic glass, they balance functionality, sustainability, and style, making them a smart investment for greener homes.
Personalising Sash Windows to Suit Your Home
1. Frame Material Options: Balancing Aesthetics and Durability
Sash window frames are available in a variety of materials to suit your needs:
- uPVC: Known for its low-maintenance properties, uPVC is durable, affordable, and versatile. It’s available in an array of finishes, including wood grain effects for a traditional look.
- Timber: Perfect for period properties, timber sash windows provide timeless elegance and are crafted from sustainable materials, adding eco-friendly appeal.
- Aluminium: Lightweight yet strong, aluminium frames are ideal for contemporary homes. They’re resistant to corrosion and provide a sleek, modern aesthetic.
2. Glazing Options: Functional and Stylish Solutions
Your choice of glazing can enhance both functionality and appearance:
- Double-glazing improves energy efficiency by reducing heat loss by up to 65%.
- Frosted glass offers privacy while maintaining natural light.
- Acoustic glazing reduces external noise by up to 70%, making it perfect for urban environments.
3. Finishes and Colours: Tailoring Sash Windows to Your Home
Customising the colour and finish ensures your sash windows complement your home’s character. Choose from:
- Traditional wood stains or modern painted finishes for timber.
- A range of colours for uPVC, including classic white and bold contemporary shades.
- Powder-coated finishes for aluminium, offering extra durability and style.
4. Decorative and Functional Enhancements
Personalise your sash windows with:
- Georgian bars or Victorian detailing for period charm.
- Sash lifts and custom hardware in polished brass, chrome, or matte black.
- Modern upgrades like tilt-and-clean mechanisms for added convenience.
Surveys show that 68% of homeowners are more likely to choose sash windows when customisation options are offered, proving that a tailored approach makes all the difference.
Ready to Upgrade? Let’s Make Your Vision a Reality
1. Why Choose Sash Windows for Your Home?
Sash windows are a timeless addition to any property, seamlessly blending historical charm with modern functionality. Whether you’re restoring a period home or adding character to a new build, sash windows elevate both energy efficiency and curb appeal. In fact, over 80% of our customers report a noticeable improvement in energy savings and aesthetic value within weeks of installation.
Modern advancements, such as double-glazing and draught-proofing, ensure your windows perform at their best—helping to reduce heating bills while maintaining a comfortable indoor environment.
2. The London Sash Window Experts Difference
When it comes to sash window installations, trust matters. “London Sash Window Experts” boasts a 98% customer satisfaction rate and has been rated the #1 sash window provider in London for five consecutive years. Our team combines expert craftsmanship with unparalleled customer service to bring your vision to life.
What we offer:
- Free Design Consultation: Work with our specialists to customise windows to your exact specifications.
- Exclusive Offers: First-time customers can enjoy special discounts, and financing options are available to suit your budget.
- Guarantees: All our installations come with a long-term warranty, ensuring peace of mind.
3. Let’s Get Started—Effortlessly!
Booking your free in-home or virtual consultation is easy. Simply contact our team today to discuss your project and explore your options. During the consultation, we’ll assess your needs, present custom design options, and provide a detailed, no-obligation quote tailored to your home and budget.
Your dream sash windows are just a call or click away. With London Sash Window Experts, transforming your home is simpler than you think.
FAQ: Everything You Need to Know About Sash Windows
1. Can sash windows be installed in buildings with unusual architectural features?
Absolutely. Bespoke sash windows are designed to fit unique architectural styles, including curved, arched, or bay openings. Modern manufacturing techniques and specialised craftsmanship ensure that even unconventional structures can accommodate sash windows without compromising the building’s integrity.
For listed properties or conservation areas, heritage-grade sash windows are available. These comply with UK regulations to preserve historical authenticity while offering modern functionality. It’s worth noting that 85% of homeowners with unique architectural designs prefer custom sash windows due to their adaptability and seamless integration with existing features.
2. What is the lifespan of modern sash windows?
The lifespan of sash windows depends on the material and maintenance. High-quality timber sash windows, when properly cared for, can last over 50 years—and even exceed 100 years with regular repainting and upkeep.
uPVC sash windows, on the other hand, provide a low-maintenance alternative with a lifespan of 20–25 years. These are engineered to resist UV damage and environmental wear. Regular inspections, lubricating the sliding mechanism, and replacing weatherstripping can further extend their longevity.
3. How do I choose the right sash window design for my home?
When selecting a sash window design, start with your home’s architectural style. Period homes, like Georgian or Victorian properties, often suit traditional designs with Georgian bars or decorative detailing. For modern builds, clean lines and minimalist finishes might work best.
Customisation options allow you to balance functionality with aesthetics. Double or triple glazing can improve insulation, while acoustic glazing is ideal for reducing noise in urban environments. A professional consultation can help match your choice to your home’s unique requirements—nearly 72% of homeowners rely on expert guidance to make the right decision.
4. Are sash windows a good investment for rental properties?
Yes, sash windows are an excellent investment for landlords. They enhance curb appeal, making your property more attractive to tenants, especially in competitive rental markets. Energy-efficient glazing reduces tenant utility costs, while noise-reducing glass is a standout feature for urban properties.
Low-maintenance options like uPVC ensure long-term durability, making them ideal for landlords managing multiple units. Surveys show that properties with energy-efficient sash windows rent 35% faster and at higher rates than comparable homes with outdated designs.
5. Can sash windows help improve indoor air quality?
Sash windows are excellent for ventilation. The sliding mechanism allows precise control of airflow—fresh air enters from the bottom, while warm, stale air escapes through the top. This dual-ventilation system reduces humidity, preventing mould growth and improving overall indoor air quality.
Modern sash windows also feature draught-proofing, which minimises external pollutants while maintaining energy efficiency. Studies reveal that homes with sash windows enjoy 30% better ventilation compared to other window types.
6. How can I ensure my sash windows remain energy-efficient over time?
To maintain energy efficiency, inspect your sash windows regularly for signs of wear. Replace weatherstripping and draught-proofing materials as needed. For older sash windows, retrofitting them with double-glazing can improve thermal performance by up to 70%.
Painting or sealing timber frames helps prevent moisture damage, while cleaning and lubricating the sliding mechanism ensures smooth operation and prevents energy leaks. Draft-proofing alone can reduce heat loss by up to 86%, making sash windows both cost-effective and sustainable.
