Key findings
- Flush sash windows are renowned for the frames and glass panes sitting completely level, creating a clean, modern look
- These windows also offer excellent energy efficiency to save money on energy bills, with A+ ratings and U-values as low as 1.0 with triple glazing
- Available in over 15 colours including white, rosewood, Irish oak and various grey options to suit any property style
- Advanced security features exceed British standards
- Professional installation by FENSA-registered fitters ensures compliance with building regulations and conservation area requirements
If you’re a homeowner looking to replace old windows whilst maintaining your property’s character, flush sash windows could be the perfect solution. These versatile windows bridge the gap between heritage appeal and modern performance, making them increasingly popular across Buckinghamshire and beyond.
Whether your home sits in a conservation area or you simply love the period look, flush sash windows deliver the authentic appearance of traditional timber designs without the associated upkeep challenges.
What are flush sash windows exactly?
Flush sash windows are a modern interpretation of traditional casement window designs, where the opening sash sits flush with the outer frame when closed. Unlike standard casement windows that protrude outwards, flush casement windows create completely flat external lines that mirror the appearance of historic timber windows.
They open in the same manner as a classic casement window, outwards like a door from the side or top, ensuring that element of simplicity and ease-of-use remains.
The flush casement design makes them particularly suitable for period properties, heritage buildings and homes in conservation areas where planning requirements often demand windows that closely replicate original features. The clean, simple lines deliver an undeniably authentic look whilst incorporating all the benefits of contemporary uPVC construction.
What are the benefits of flush sash windows?
Superior energy efficiency
Modern flush sash windows offer excellent energy efficiency that can dramatically reduce your energy bills. Our energy efficient flush windows achieve A+ Window Energy Ratings with double glazing, whilst advanced triple glazing delivers U-values as low as 1.0.
Put simply, windows with strong U-values help lower your energy bills by reducing heat transfer – keeping your home warmer in winter and blocking out excess heat and glare in summer. The result? A more comfortable living space and less reliance on radiators, fans, and other temperature controls.
For rooms that tend to overheat in summer or feel chilly in winter, temperature-regulating Low-E glass offers year-round comfort. It’s a big step up from traditional single-glazed windows, which often let in draughts and contribute to energy loss, especially in heritage properties.
Low maintenance and durability
Unlike timber alternatives, uPVC flush windows never need repainting and won’t rot, swell or warp over time. This makes them ideal for homeowners seeking the period aesthetic without the ongoing maintenance requirements of traditional materials.
The robust uPVC construction ensures a long lifespan with minimal upkeep, whilst the quality of the windows remains consistently high throughout their working life.
Increased security features
All flush sash windows from Double Glazing Direct come with high-quality window locks as standard and can achieve PAS 24: 2016 Enhanced Security Performance status. This means they exceed British standards and can resist physical attacks by opportunist burglars, providing peace of mind alongside period charm.
Customisation options for flush sash windows
Wide range of colours available
Our flush sash windows come in an extensive range of colours to complement any property style. Choose from classic white, elegant cream, or rich rosewood for traditional appeal. For contemporary tastes, options include anthracite grey, steel grey, storm grey and titanium grey.
Natural wood effects like golden oak, Irish oak and silvered oak provide authentic timber appearance, whilst unique shades like chartwell green and eclectic grey offer distinctive character.
Decorative glazing options
Beyond clear glass, decorative glazing adds privacy and visual interest to heritage projects. Options include cassini, taffeta, reeded, minster, mayflower and digital patterns, allowing you to create truly bespoke installations that reflect your home’s individual character.
Decorative glass is ideal for places like bathrooms, where privacy is the priority.
Heritage hardware and detailing
Authentic finishing touches complete the period look. Choose from chrome inline locking handles for contemporary appeal or exquisite Monkey Tail handles that hark back to simpler times.
Teardrop dummy window stay bars, Georgian bars, Astragal bars and mock sash horn detailing options ensure your flush windows perfectly match your property’s architectural style.
Are flush sash windows suitable for conservation areas?
Yes, flush sash windows are specifically designed for conservation areas and heritage properties.
Their traditional lines and authentic appearance often satisfy planning requirements for period property window replacements whilst delivering modern performance benefits.
Flush sash windows from Double Glazing Direct
At Double Glazing Direct, our flush sash windows are crafted using VEKA Group profiles and manufactured to the highest standards. We serve homeowners across Aylesbury, Buckingham and throughout Buckinghamshire, as well as Hertfordshire and Oxfordshire, with bespoke uPVC windows that combine heritage styling with modern engineering.
Every installation begins with a free, no-obligation home survey from our local surveyors. We assess your property’s conservation requirements and recommend the ideal profile and glazing solution. Our FENSA-registered installers ensure every window meets building regulations with a watertight, draught-free finish.
All work is backed by our comprehensive 10-year insurance-backed guarantee, and you can view our full range at our Aylesbury showroom before making your decision.
Frequently asked questions
Do flush sash windows cost more than standard casement windows? Flush sash windows typically cost slightly more due to their specialised design and heritage features.
Can flush casement windows be fitted with triple glazing? Yes, all our flush windows can accommodate advanced triple glazing for maximum energy efficiency.
How long do uPVC flush sash windows last? With proper installation, quality uPVC flush sash windows can last 20-30 years with minimal maintenance required.
Are flush windows suitable for modern homes? Absolutely – their versatile design works beautifully in both period and contemporary properties across the UK.
Who are Double Glazing Direct?
Double Glazing Direct is a full-service glazing company serving Aylesbury, Buckingham, High Wycombe and throughout Buckinghamshire. With decades of experience, we specialise in high-quality, cost-effective home improvements for homeowners and businesses.
Our comprehensive range includes uPVC windows, aluminium windows, composite doors, conservatories and more. Every installer and surveyor is trained to strict industry standards, ensuring work complies with the latest Building Regulations.
We’re proud to hold multiple accreditations including FENSA Approved, Which? Trusted Trader and TrustMark Government Endorsed Quality status. Visit our Aylesbury showroom Monday-Friday 8:30am-4:30pm, or contact us on 01296 320252 or sales@doubleglazing-direct.com for your free consultation.
