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Premium Flush Sash Windows

Experience the sleek contemporary look of flush sash windows with authentic timber aesthetics - perfect for both modern homes and heritage properties

⭐⭐⭐⭐⭐Rated 4.9/5 from 300+ reviews

10 Year Comprehensive Guarantee

Sleek Design, Modern Performance

Why Choose Flush Sash Windows for Your UK Property?

Contemporary Style with Traditional Timber Aesthetics

Inspired by traditional timber joinery and Scandinavian minimalism, flush sash windows feature a sash that sits perfectly level with the outer frame when closed, creating a sleek, flat exterior profile.

Available in uPVC, aluminum, timber, and composite options, each flush sash window is custom-manufactured to your specifications, offering excellent thermal performance, enhanced security features, and a minimalist contemporary aesthetic that perfectly complements both modern homes and heritage properties.

Sleek Minimalist Design

Flush exterior for clean, contemporary aesthetics

Superior Thermal Efficiency

Tight seal for optimal energy performance

Enhanced Security

Flush design eliminates external gaps for better protection

Flush sash windows showcasing sleek design with timber aesthetics and modern performance

Sophisticated flush design

Perfect for contemporary living

Flush Design

Sleek minimalist profile

Energy Savings

A+ energy rated

Year Guarantee

Comprehensive warranty

Years Lifespan

Low maintenance design

0.0

Star Rating

300+ verified reviews

20% OFF

Your First Project

Limited time offer for new customers. Transform your home with our premium Flush Sash windows.

*Terms and conditions apply. Offer valid until end of month.

Key Benefits of Flush Sash Windows

Why Choose Flush Sash Windows

Flush sash windows combine sleek minimalist design with authentic timber aesthetics, featuring a sash that sits perfectly level with the frame for a clean, contemporary appearance with excellent thermal performance.

Long Lasting

Engineered using premium materials and contemporary manufacturing techniques, our flush sash windows are built to maintain their sleek appearance and smooth operation.

Award Winning

Our flush sash windows have earned recognition for their innovative design, combining minimalist aesthetics with outstanding thermal performance.

Expert Installation

Our specialist installers ensure precise fitting of your flush sash windows, maintaining the clean lines and perfect flush finish that defines these contemporary windows.

Easy Maintenance

The flush design eliminates dirt-trapping gaps, while high-quality materials and modern manufacturing ensure minimal maintenance requirements and lasting performance.

Harrington flush sash windows showcasing sleek design and contemporary aesthetics

Contemporary Style with Authentic Appeal

Our flush sash windows combine sleek minimalist aesthetics with traditional timber detailing. Featuring a flush exterior that sits perfectly level with the frame, they provide a clean, contemporary look with excellent thermal efficiency and enhanced security.

Sleek flush exterior eliminating unsightly gaps
A+ energy rating with tight weatherproof seal
Enhanced security with flush design and multi-point locking

Flush Sash Windows Product Details

Engineered for Contemporary Style and Performance

Flush Sash Windows Design Features

Our flush sash windows combine authentic period aesthetics with modern engineering, creating sleek windows that honor traditional design while delivering contemporary performance.

Vertical Sliding Operation

Traditional vertical sliding mechanism that allows both top and bottom sashes to move independently for flexible ventilation control.

Authentic Period Details

Carefully crafted features including decorative horns, astragal bars, and traditional hardware that replicate the look of original timber sash windows.

Easy-Clean Tilt Function

Modern tilt-in mechanism allowing both sashes to tilt inward for safe and convenient cleaning from inside your home.

Heritage Design

With modern functionality

Flush Sash Windows Installation Process

How we expertly fit your contemporary flush sash windows

Free Consultation & Measure

Our window specialists visit your home to assess your existing windows, take precise measurements, and discuss flush sash window options that complement your property's contemporary or traditional style.

Detailed Design & Quote

We create detailed designs for your flush sash windows, considering elements like frame style, flush finish, and hardware options, then provide a transparent, no-obligation quote.

Manufacturing

Your flush sash windows are precision-engineered using modern manufacturing techniques to ensure a perfect flush fit, contemporary aesthetics, and superior performance.

Professional Installation

Our specialist installers carefully remove existing windows and fit your flush sash windows with precision, ensuring perfect alignment for that signature flush finish and complete weatherproofing.

Final Inspection & Aftercare

We demonstrate how to operate and maintain your flush sash windows, complete a thorough inspection of the flush fit and operation, and provide comprehensive documentation for your warranty and care instructions.

Sliding sash windows installation step 1 - professional fitting process

Free Consultation & Measure

We take precise measurements of your existing windows and discuss your preferences for flush sash window designs, hardware finishes, and glazing options. Our specialists will evaluate your property's style to recommend the most suitable contemporary or traditional flush sash solutions.

Free Service

Expert consultation at no cost

Flush Sash Windows Gallery

See our flush sash windows in action

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Our Guarantee

Flush sash windows you can trust for decades

20-Year Frame Guarantee

Our flush sash window frames are guaranteed to maintain their structural integrity, flush fit, and contemporary appearance for 20 years.

10-Year Hardware Warranty

All our flush sash windows feature premium locking mechanisms and hardware backed by a dedicated 10-year warranty ensuring secure, reliable operation.

Insurance-Backed Guarantee

For complete reassurance, all our flush sash window guarantees are insurance-backed by specialist window insurers.

Specialist Service Promise

Our dedicated flush sash window specialists will respond within 48 hours to address any operational or maintenance concerns with your windows.

Our Promise to You

We stand behind the quality of our flush sash windows and specialist installation. Each window is crafted with precision, combining contemporary design with modern performance to ensure your complete satisfaction for decades to come.

Customer Testimonials

Hear from our satisfied clients

★★★★★

The flush sash windows have transformed our modern property. The sleek, minimalist design fits perfectly with our contemporary home while providing excellent thermal efficiency and security.

Sarah Thompson

Cambridge

★★★★★

Harrington's craftsmanship is exceptional. The flush sash windows look stunning with their clean lines and flush fit. They've made a huge difference to both the appearance and warmth of our home.

James Wilson

London

★★★★★

From consultation to installation, Harrington Windows provided excellent service. Our new flush sash windows have given our property a modern update while maintaining a traditional feel. The energy efficiency is remarkable.

Emma Roberts

Essex

★★★★★

4.9 out of 5

★★★★★

9.87 out of 10

Standard Sash Windows

Basic opening options

Modern Casement Windows

Dual sash operation

Feature	Our Flush Sash Windows	Standard Casement Windows	Traditional Sash Windows
Energy Efficiency	A++ rated with advanced seals	A-rated standard	B-C rated typically
Security	Multi-point locking with flush design	Basic multi-point locks	Traditional sash locks
Maintenance	Minimal - wipe clean design	Standard cleaning needed	Regular maintenance required
Lifespan	25+ years with minimal care	20-25 years	15-20 years typical
Weather Resistance	Excellent with flush seal	Good weather resistance	Moderate - needs adjustment
Noise Reduction	Superior acoustic performance	Standard noise reduction	Basic sound insulation
Contemporary Style	Perfect flush contemporary look	Modern appearance	Traditional period style
Ventilation Control	Multiple opening positions	Basic opening options	Dual sash operation

Need help deciding on the perfect flush sash solution for your property? Our experts can guide you through the options and help you choose the ideal flush sash windows for your home's style and your budget.