Get 20% Off your First Project

Classic Sash Windows

Add character and value to your home with draught-free, secure sash windows that cut heating costs by up to 40%

⭐⭐⭐⭐⭐Rated 4.9/5 from 300+ reviews

10 Year Guarantee

Conservation Approved

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

Harrington premium sash window with authentic period styling and modern thermal efficiency

Crafted with precision and care

Every detail meticulously designed

Years Lifespan

Minimum expected durability

Energy Savings

Average heating cost reduction

Satisfaction

Customer satisfaction rate

Year Guarantee

Full parts and labor warranty

0.0

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

Harrington sash windows installed in a conservation area property - perfect for period homes

Perfect for Conservation Areas

Our sash windows are specifically designed to meet conservation area requirements, replicating traditional timber windows while providing modern benefits. They've 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.

Traditional Styling

With modern materials

Our Installation Process

How we ensure a perfect fit every time

Free Consultation & Measure

Our local experts visit your home to understand your requirements, take precise measurements, and provide tailored advice.

Detailed Design & Quote

We create a made-to-measure window design that suits your home's style and provide a clear, no-pressure quote.

Manufacturing

Your windows are built to exact measurements using quality materials and skilled British craftsmanship.

Professional Installation

Our skilled fitters install your windows with minimal disruption, typically taking just 1-2 days per property.

Final Inspection & Aftercare

We conduct a thorough inspection and walkthrough, backed by our comprehensive guarantee and aftercare service.

Free Consultation & Measure

We take precise measurements of your existing windows and discuss your preferences for style, colour, and functionality. Our experts will assess your property's specific requirements and explain the best options available.

Free Service

No cost, no pressure

Our Gallery

See our work in action

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.

Our Promise to You

We stand behind the quality of our products and workmanship. If you're not completely satisfied, we'll make it right. It's that simple.

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

★★★★★

4.9 out of 5

★★★★★

9.87 out of 10

Standard uPVC Windows

1 day

Traditional Timber

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