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Classic Sash Windows
Add character and value to your home with draught-free, secure sash windows that cut heating costs by up to 40%
Timeless Elegance, Modern Performance
Introduction
Carefully crafted to suit your home's character, our made-to-measure sash windows blend traditional charm with modern innovations perfect for British weather.
Each window is built to your exact measurements, offering excellent heat retention, robust security features, and authentic period styling that enhances your property whilst preserving its architectural heritage.
Authentic Period Aesthetics
Perfect replication of traditional timber sash windows
Outstanding Performance
A+ energy rating with robust security fixtures
Carefully Crafted to Measure
Tailor-made to your exact specifications
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Years Lifespan
Minimum expected durability
Energy Savings
Average heating cost reduction
Satisfaction
Customer satisfaction rate
Year Guarantee
Full parts and labour warranty
Star Rating
Average customer review
20% OFF
Your First Project
Limited time offer for new customers. Transform your home with our premium sash windows.
*Terms and conditions apply. Offer valid until end of month.
Key Benefits
Why Choose Our Sash Windows
Our windows combine traditional aesthetics with modern performance, giving you the best of both worlds.
Enhanced Security
Multi-point locking systems and reinforced frames for complete peace of mind
Energy Efficient
A+ rated windows that help reduce energy bills and improve comfort
Low Maintenance
Easy to clean and maintain, never needs painting or treating
Secured by Design
Police-approved security features that exceed British Standards
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Perfect for Conservation Areas
Our sash windows are specifically designed to meet conservation area requirements, replicating traditional timber windows while providing modern benefits. They have been approved for use in many conservation areas across the UK.
- Authentic period aesthetics
- Conservation officer approved
- Maintains property value
Product Details
Crafted With Precision
Authentic Design Features
Our sash windows are meticulously designed to replicate traditional timber windows while incorporating modern materials and techniques.
Slim 35mm Midrail
Elegant, slim profile that maximizes glass area while maintaining authentic proportions.
Mechanical Butt Joints
Traditional joinery techniques that create authentic corner details without visible welding.
Seamless Sash Horns
Optional decorative sash horns that replicate traditional timber window details.
Eclipse Concealed Vents
Hidden trickle ventilation that maintains airflow without compromising aesthetics.
Deep Cill Design
Authentic deep cill profiles that match traditional window designs.
Our Installation Process
How we ensure a perfect fit every time
Free Consultation & Measure
We take precise measurements of your existing windows and discuss your preferences for style, colour, and functionality. Our experts assess your property's needs and explain the best options available.
Free Service
No cost, no pressure
Our Gallery
See our work in action
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Our Guarantee
Your peace of mind is our priority
35-Year Frame Guarantee
Our frames are guaranteed to maintain structural integrity and performance for 35 years.
10-Year Installation Warranty
All our installations come with a full 10-year workmanship warranty for peace of mind.
Insurance-Backed Guarantee
For complete reassurance, all our guarantees are insurance-backed by trusted UK providers.
Rapid Response Promise
In the unlikely event of an issue, we guarantee a 48-hour callout anywhere in our service area.
Customer Testimonials
Hear from our satisfied clients
Outstanding service from start to finish. Our new sash windows look incredible and have transformed our home's warmth and comfort. Highly recommended.
James R
Hampstead
The quality of Harrington's sash windows is exceptional. They've perfectly matched our period property's style while providing modern insulation. Couldn't be happier.
Sarah M
Surrey
From consultation to installation, Harrington Windows provided a truly premium service. Our new sash windows have completely transformed our home's appearance and comfort.
David & Emma P
Kent
Inspired by these projects? Let's create something beautiful for your home.
Compare Your Options
See how our sash windows measure up
Perfect match to original
Modern appearance
Original style
A+ Rated
A Rated
Poor insulation
Minimal maintenance
Low maintenance
Regular maintenance needed
Robust locking mechanisms
Basic security
Good when maintained
35+ years
20-25 years
60+ years if maintained
Excellent draught exclusion
Good
Requires regular treatment
Quality investment
Most affordable
Highest cost
1-2 days
1 day
3-4 days
| Feature | Our Sash Windows | Standard uPVC Windows | Traditional Timber |
|---|---|---|---|
| Authentic Period Look | Perfect match to original | Modern appearance | Original style |
| Energy Efficiency | A+ Rated | A Rated | Poor insulation |
| Maintenance | Minimal maintenance | Low maintenance | Regular maintenance needed |
| Security | Robust locking mechanisms | Basic security | Good when maintained |
| Lifespan | 35+ years | 20-25 years | 60+ years if maintained |
| Weather Resistance | Excellent draught exclusion | Good | Requires regular treatment |
| Cost | Quality investment | Most affordable | Highest cost |
| Installation Time | 1-2 days | 1 day | 3-4 days |
Need help deciding?
Our window experts can help you compare options and choose the perfect solution for your home.
Our Service Locations
Premium sash windows installation across the UK
North London
Premium sash windows in North London
Our specialist installation teams cover North London, including:
West London
Premium sash windows in West London
Our specialist installation teams cover West London, including:
East London
Premium sash windows in East London
Our specialist installation teams cover East London, including:
South London
Premium sash windows in South London
Our specialist installation teams cover South London, including:
Hertfordshire
Premium sash windows in Hertfordshire
Our specialist installation teams cover Hertfordshire, including:
Essex
Premium sash windows in Essex
Our specialist installation teams cover Essex, including:
Cambridge
Premium sash windows in Cambridge
Our specialist installation teams cover Cambridge, including:
Our Windows
Explore our complete range of premium window solutions
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Ready to Transform Your Home?
Get started with a free consultation and quote. Our experts are ready to help you find the perfect sash windows for your home.
Or call 0203 917 4308 to speak with a specialist now.