Clean, equal sightlines
The sash sits level with the frame; dummy sashes create balanced proportions and more natural light.
Achieve a Sleek and Modern Look with Flush Sash Windows
With our high quality flush sash casement windows, you can achieve a sleek and modern look for your property. These windows are a popular choice among UK homeowners, and have frames that align perfectly with the surrounding walls, creating contemporary style and a clean and unobtrusive appearance that complements all architectural styles. Whether you want to replace a few selected windows or fit new ones across your entire property, our team at Crown will work closely with you to create a package that suits your requirements.
Why Should You Choose Flush Sash Windows?
Energy performance
Advanced frames and glazing help reduce heat loss and keep rooms comfortable year-round.
Design options
uPVC or aluminium, woodgrain foils and RAL colours, monkey-tail or pear-drop handles, and optional mechanical joints.
UPVC Windows
Best Price Guaranteed
- Excellent thermal efficiency
- Enhanced security
- Highly customisable
Casement Windows
Best Price Guaranteed
- Unobstructed views
- Excellent ventilation
- Enhanced security
Sliding Sash Windows
Best Price Guaranteed
- Energy efficient
- Enhanced security
- Timeless aesthetic
Tilt & Turn Windows
Best Price Guaranteed
- Versatile ventilation
- Easy cleaning
- Energy efficient
Georgian Windows
Best Price Guaranteed
- Thermally efficient
- Enhanced security
- Period aesthetic
Lead Windows
Best Price Guaranteed
- Customisable design
- Suitable for any property
- Expertly crafted
The perfect style options to suit your home
Our range of flush sash windows offers extensive customisation possibilities including a full range of colours, sizes and additional features which add further authenticity if desired.
- Colour Options
- Glass Options
- Brochures
Colour Options
White
Walnut Ameretto
Basalt Grey Sanded
Agate Grey
Walnut Terra
Walnut
Oregon
Dark Oak
Oak Special
Mahogany
Steel Blue
Oak Alpine
Grey Sanded
Anthracite Grey
Grey
Cream
Dark Red
Palisander
Oak Concrete
Dark Green
Anthracite Grey Sanded
White Woodgrain
Turner Oak Malt
Green
Brilliant Blue
Birch
Irish Oak
Golden Oak
Chartwell Green
Rosewood
Aluminium Brushed
Rosewood White
Palisander - White
Oak - White
Glass Options
Autumn
Taffeta
Sycamore
Stippolyte
Minister
Mayflower
Laurel
Florielle
Flemish
Digital
Cotswold
Contour
Charcoal
Chantilly
Brochures
Have Questions About Our Windows, Doors & Conservatories?
Choosing the right windows, doors, and conservatories for your home is an important decision. We’ve answered some of the most common questions to help you understand our products, installation process, and what to expect. If you need more details, our team is always happy to help.
Can't see the answer you're looking for?
Contact UsAre flush sash windows suitable for conservation areas?
Yes! Our range of flush sash windows includes designs that are specifically tailored to meet the requirements of conservation areas. We understand the importance of preserving the architectural integrity and character of these special locations, which is why we offer window styles that blend seamlessly with traditional and period properties.
What maintenance do flush sash windows require?
With their low-maintenance features like uPVC construction or aluminium cladding options our flush sash casement windows require minimal upkeep.
Can I save on my energy bills by installing flush sash windows?
Absolutely! Thanks to their high thermal benefits, our flush sash windows help to reduce heat loss and lower your energy consumption.
Are flush sash windows secure?
Yes! Our flush sash windows come with high-quality locking mechanisms that provide excellent security for your home.
Do you offer a guarantee on flush sash windows?
All of our installations come with a 10-year warranty and insurance-backed guarantee as standard.
Added Elegance
Enhance Your Property with Our Flush Sash Window Solutions
Upgrade your home with made-to-measure windows, doors, and conservatories, designed to fit seamlessly with your property’s style.
- Windows: Whether you prefer classic casement windows or modern sliding sash, our range includes uPVC, flush sash, tilt & turn, Georgian, and lead designs, all crafted for a precise fit.
- Doors: Find the perfect entrance with uPVC, composite, bi-fold, French, patio, and internal doors, offering a combination of security and style.
- Conservatories: Add valuable space with a Victorian, lean-to, gable-end, Edwardian, Georgian, or combination conservatory. For better insulation, our Guardian Tiled Conservatory Roofs provide a stylish and energy-efficient upgrade.
Every product is built to last, ensuring quality, durability, and expert craftsmanship in every installation.
Contact UsFlush sash windows energy ratings and U-values
Get strong thermal performance with modern chambered profiles, tight gaskets and high-spec glass units. Choose double glazing for value or triple glazing to push U-values lower and limit drafts. We can add laminated panes for security or noise, plus low-iron and solar-control options for brighter rooms and smoother temperatures.
Security is built in. You get robust multi-point locking and internal glazing beads as standard.
Ask about PAS 24 test options and Secured by Design packages. They add upgraded hardware, reinforced points and glass choices that resist forced entry. Trickle vents, child-safe restrictors and safety glazing can be specified to suit bedrooms, stairs or door-side windows.
Get A Quote
uPVC and aluminium flush sash windows colours and hardware
Upgrade your home with made-to-measure windows, doors, and conservatories, designed to fit seamlessly with your property’s style.
- Windows: Whether you prefer classic casement windows or modern sliding sash, our range includes uPVC, flush sash, tilt & turn, Georgian, and lead designs, all crafted for a precise fit.
- Doors: Find the perfect entrance with uPVC, composite, bi-fold, French, patio, and internal doors, offering a combination of security and style.
- Conservatories: Add valuable space with a Victorian, lean-to, gable-end, Edwardian, Georgian, or combination conservatory. For better insulation, our Guardian Tiled Conservatory Roofs provide a stylish and energy-efficient upgrade.
Every product is built to last, ensuring quality, durability, and expert craftsmanship in every installation.
Contact UsDiscover the Latest News from Crown
Read all about the latest home improvement trends to help take your property to the next level.
Transform Your Bicester Home with Victorian Conservatories
30 August 2025
Key findings Victorian conservatories combine classic period charm with practical extra space – those distinctive...
Energy Efficiency: Installing Flush Sash Windows in Aylesbury Properties
29 August 2025
Key findings · Flush sash windows perfectly combine period aesthetics with modern thermal efficiency, making...
Composite vs uPVC Doors: Which Offers Better Security and Style?
3 August 2025
Key Findings Composite doors offer the market’s highest level of security, thermal efficiency, and durability....
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