Flush Sash Windows
Authentic Flush Sash Windows With Timeless, Timber-Look Craftsmanship
Flush sash windows bring the elegance of traditional timber joinery to your home, with a sash that sits flush within the frame for clean, uninterrupted lines. Available in uPVC and aluminium, and backed by A-rated energy efficiency and PAS 24 security, our flush sash window range is trusted across Buckinghamshire, Oxfordshire and the surrounding areas.
- Free On-Site Survey & Written Quote
- Welded Joints, Timber-Look Finish
- PAS 24 & Secured by Design Compliant
25+ years in business
Certified installers
1000+ Home installations
10 Year guarantee
What a Flush Sash Window Involves?
A flush sash window replicates the sightlines of a traditional timber sash, with the sash sitting flush within the outer frame rather than overlapping it. There’s no external overlap and no visible step between sash and frame, just the clean, classic lines period properties are known for.
Available as flush sash uPVC windows or aluminium flush sash windows, every unit is built from a multi-chambered frame with double or triple glazed units, double weather seals, and a full multi-point locking system.
When You Might Need Flush Sash Windows?
Flush sash windows are the natural choice when replacing tired timber sashes that have started to warp, rot, or let in draughts, and when updating standard casement windows on a period or conservation property where planning restrictions call for an authentic sash appearance.
They’re equally suited to contemporary and new-build properties, where slim sightlines and superior thermal efficiency are the priority. If you’re weighing up a flush sash window replacement against a standard casement window alternative, our team can advise during your free survey.
Start your Project Today
Take the first step towards a more comfortable, secure, and better-looking home. Whether you’re replacing a single window or upgrading your entire property, our team makes the process simple from start to finish. You’ll get expert advice, tailored designs, and clear pricing with no pressure.
Colours
Handles
Cills
Obscure Glass
Glazing Options
Colours, Finishes & Cost
Whether you prefer traditional elegance or contemporary styling, our flush sash windows are available in carefully selected finishes designed to enhance your home’s character. Popular options include white, cream, anthracite grey, black, chartwell green, and realistic woodgrain effects. These durable finishes help maintain their appearance while supporting a cohesive design across your property.
Window Cills for Protection & a Perfect Finish
Choosing the right glazing can transform how your rooms feel and function. Flush Sash uPVC offers a range of decorative, obscure, and specialist glass solutions that help balance privacy, daylight, aesthetics, and security while complementing the architectural style of your property.
95mm Cill
Ideal for standard installations where minimal projection is required while maintaining effective weather protection and a neat finish.
150mm Cill
A versatile option suitable for many residential properties, providing additional projection and improved water management.
180mm Cill
Popular for deeper wall constructions and renovation projects where greater coverage and protection are needed.
250mm Cill
Designed for properties requiring substantial projection, making it suitable for deeper reveals and rendered walls.
Handles that complete the Look
Hardware is often the finishing detail that defines a window’s character. Our carefully selected handle collection combines aesthetics, comfort, and durability. Available in traditional and contemporary designs, these options allow homeowners to coordinate windows with existing doors, architectural features, and interior décor.
White OS
Satin OS
Chrome OS
Graphite OS
Bronze OS
Black LL
Antique Black OS
Gold OS
Chrome MT
Gold MT
Antique Black MT
Graphite MT
Chrome TD
Graphite TD
Antique Black TD
Gold TD
Glass Choices for Privacy and Natural Light
Choosing the right glazing can transform how your rooms feel and function. We offer a range of decorative, obscure, and specialist glass solutions that help balance privacy, daylight, aesthetics, and security while complementing the architectural style of your property.
Advanced Glazing for Better Performance
Modern glazing technology plays a major role in comfort, efficiency, and noise reduction. Our glazing solutions help create a quieter, warmer, and more energy-efficient home while supporting long-term performance and reducing heat loss throughout the year.
Triple
Glazed
Laminated
Glass
Square
Lead
Diamond
Lead
Internal
Georgian Bar
Joint & Weld Options Tailored to your Window Design
The way window corners are manufactured can significantly influence the overall appearance of the finished product. We offer both welded and mechanical joint options, allowing homeowners to choose a finish that best complements their property’s architectural style and design preferences.
Welded Joint
A strong and durable modern construction method that creates clean, seamless corners. Welded joints are ideal for contemporary homes and homeowners seeking a sleek, low-maintenance finish.
Mechanical Joint
Designed to replicate the appearance of traditional timber windows, mechanical joints provide an authentic heritage aesthetic that is particularly popular for period-style.
Enjoy Privacy without The Maintenance with Integral Blinds
Integral blinds are permanently sealed within the double-glazed unit, offering a stylish, maintenance-free solution for light control and privacy. Unlike conventional blinds, they remain protected from dust, moisture, and everyday damage, keeping them looking clean for years. Ideal for busy family homes, integral blinds combine modern convenience with improved energy efficiency and a sleek, uncluttered appearance that perfectly complements flush sash windows.
Book a Free Home Survey
Provide us details about your project.
Why Choose Our Flush Sash Windows
Authentic, Timber-Look Design
Mechanically jointed or welded construction replicates traditional timber joinery for a genuinely authentic, meticulously designed flush sash finish, ideal for period and conservation properties.
A-Rated Energy Efficiency
Multi-chambered frames and double or triple glazing deliver low U-values, superior thermal efficiency, and energy ratings up to A/A+.
Secure by Design
Multi-point locking as standard, with PAS 24 and Secured by Design compliance confirming genuine, trusted security performance.
Recent Flush Sash Windows Projects
Take a look at some of our recent Flush Sash Windows installations. Each project reflects our focus on quality, detail, and design.
Flush Sash Window Tips & Insights
Planning a flush sash window installation? These guides can help.
- What Are Flush Sash Windows?
- Flush Sash vs Sculptured vs Chamfered Windows
- uPVC vs Aluminium Flush Sash Windows
- Flush Sash Windows for Conservation Areas
Quality, Compliance & Guarantees
Every flush sash window is installed by experienced, insured fitting teams and backed by a workmanship guarantee alongside the manufacturer’s warranty on materials and glazing. Each window meets British Standard Kitemark quality standards, PAS 24 and Secured by Design security compliance, and satisfies conservation area compliance for period and heritage properties.
Get Your Free Flush Sash Windows Quote
Ready to bring the enduring elegance of a flush sash window to your home? Get a free, no-obligation quote from our experienced team, covering uPVC and aluminium range across Buckinghamshire and Oxfordshire.
FAQs
Common questions we are asked the most
What is a flush sash window?
A flush sash window is a type of casement window where the opening sash closes completely flat and level with the outer frame, creating a smooth exterior with no overlapping lip. We supply flush sash windows in both uPVC and aluminium. Request a free quote to discuss options for your property.
Are flush windows more expensive?
Flush sash windows typically carry a price premium of around 10 to 15% over standard casement windows. This comes down to the tighter manufacturing tolerances and precise alignment needed for the sash to sit completely flat against the frame. Get a free, no-obligation quote for an accurate price on your project.
What are the disadvantages of flush windows?
Flush sash windows cost more and demand a higher standard of precision installation than a standard lipped casement window. Some designs also use dummy sashes, which can slightly reduce the visible glass area compared to a standard casement. Our team can talk you through the trade-offs during your free survey.
What is the difference between flush and non-flush windows?
The difference comes down to how the sash sits in the frame. On a flush window, the sash closes completely level and flat with the outer frame, while on a non-flush, or lipped, casement window, the sash sits proud and overlaps the frame with a visible lip. Contact us to discuss which style suits your property.
Are flush fit windows better?
Flush fit windows aren’t automatically the “better” option; they simply offer a different look and a different balance of cost and construction. Whether they’re right for you depends on your property style and your budget. Speak to our team for tailored advice.
What do flush windows look like?
Flush windows have a smooth, flat exterior appearance, with the sash closing completely level against the outer frame and no raised lip or overlapping step. Finished with heritage-style hardware and optional astragal or Georgian bars, they give a clean, streamlined look. Get a free quote to see finish and colour options for your home.