Heritage look, modern performance

Flush sash replicates traditional timber casements with authentic, slim sightlines and a neat, understated profile. From period cottages to minimalist extensions, the design blends in effortlessly while elevating kerb appeal. Choose from a wide palette of colours, including classic whites, soft neutrals, and popular greys, plus ultra-realistic woodgrain foils that mirror the texture of painted or stained timber—without the upkeep. Add dummy peg stays, mechanical joints, and traditional hardware for a convincingly period aesthetic, or specify sleek contemporary handles for a modern twist. Bring your plans to the showroom and we’ll help you finalise the perfect combination.

cream flush sash window
white upvc flush window

Why Should You Choose Flush Sash Windows?

Clean, equal sightlines

The sash sits level with the frame; dummy sashes create balanced proportions and more natural light.

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.

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White double window with multiple panes set in a rustic stone wall of a cottage.

UPVC Windows

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  • Excellent thermal efficiency
  • Enhanced security
  • Highly customisable
smarts black window

Casement Windows

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  • Unobstructed views
  • Excellent ventilation
  • Enhanced security
white ecoslide window

Sliding Sash Windows

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  • Energy efficient
  • Enhanced security
  • Timeless aesthetic
white tilt and turn window

Tilt & Turn Windows

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  • Versatile ventilation
  • Easy cleaning
  • Energy efficient
A white Georgian window uPVC triple-paned window installed in a brick house exterior, with part of a bare tree branch visible in the foreground.

Georgian Windows

Best Price Guaranteed

  • Thermally efficient
  • Enhanced security
  • Period aesthetic
lead georgian windows

Lead Windows

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  • 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

White

Walnut Ameretto

Walnut Ameretto

Basalt Grey Sanded

Basalt Grey Sanded

Agate Grey

Agate Grey

Walnut Terra

Walnut Terra

Walnut

Walnut

Oregon

Oregon

Dark Oak

Dark Oak

Oak Special

Oak Special

Mahogany

Mahogany

Steel Blue

Steel Blue

Oak Alpine

Oak Alpine

Grey Sanded

Grey Sanded

Anthracite Grey

Anthracite Grey

Grey

Grey

Cream

Cream

Dark Red

Dark Red

Palisander

Palisander

Oak Concrete

Oak Concrete

Dark Green

Dark Green

Anthracite Grey Sanded

Anthracite Grey Sanded

White Woodgrain

White Woodgrain

Turner Oak Malt

Turner Oak Malt

Green

Green

Brilliant Blue

Brilliant Blue

Birch

Birch

Irish Oak

Irish Oak

Golden Oak

Golden Oak

Chartwell Green

Chartwell Green

Rosewood

Rosewood

Aluminium Brushed

Aluminium Brushed

Rosewood White

Rosewood White

Palisander - White

Palisander - White

Oak - White

Oak - White

Glass Options

Autumn

Autumn

Taffeta

Taffeta

Sycamore

Sycamore

Stippolyte

Stippolyte

Minister

Minister

Mayflower

Mayflower

Laurel

Laurel

Florielle

Florielle

Flemish

Flemish

Digital

Digital

Cotswold

Cotswold

Contour

Contour

Charcoal

Charcoal

Chantilly

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?

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What’s the difference between standard casement and flush sash windows?

Standard casements have a “lipped” sash that sits proud of the frame. Flush sash sits level with the frame, creating a flat, streamlined exterior that’s closer to traditional timber styling.

Are flush sash windows energy-efficient?

Yes. Multi-chambered uPVC frames and advanced double or triple glazing help retain heat, reduce draughts, and improve acoustic comfort—supporting high energy ratings when correctly specified.

Can I install flush sash windows in a conservation area?

Often, yes—because their authentic appearance is sympathetic to period architecture. Policies vary by authority, so always check local requirements. We can provide drawings, samples, and guidance to support your application.

Order Process

At Crown Conservatories, Windows and Doors Ltd , we believe in making the order process as simple and convenient as possible for our customers. Here's how it works:

Quotation

Once you get in touch with us regarding your project, you can expect a response from our team within 24 hours.

Design & Survey

A 3D design plan and expert guidance help you visualise your final result. Our attention to detail ensures a seamless fit and high-quality finish.

Installation

Our experienced fitting teams will ensure that your new windows and doors are installed with precision and care.

Aftercare

Our products come with a 10-year warranty as standard. Should any issues arise, you can rely on us to address them.
anthracite grey flush windows
Added Elegance

Heritage look, modern performance

Flush sash replicates traditional timber casements with authentic, slim sightlines and a neat, understated profile. From period cottages to minimalist extensions, the design blends in effortlessly while elevating kerb appeal. Choose from a wide palette of colours, including classic whites, soft neutrals, and popular greys, plus ultra-realistic woodgrain foils that mirror the texture of painted or stained timber—without the upkeep.

Add dummy peg stays, mechanical joints, and traditional hardware for a convincingly period aesthetic, or specify sleek contemporary handles for a modern twist. Bring your plans to the showroom and we’ll help you finalise the perfect combination.

Contact Us

Warm, efficient, and quiet

Behind the heritage styling is a multi-chambered uPVC frame engineered for thermal efficiency. Specify high-performance double or triple glazing to retain heat, cut draughts, and improve acoustic comfort—great for homes near busy roads or schools.

The flush exterior and quality seals help reduce air leakage, while low-iron, argon-filled glass options support excellent energy ratings. The result is a brighter, more comfortable living space with lower everyday maintenance than traditional timber and dependable performance all year round.

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white upvc flush fit rear window
white upvc flush sash window

Secure and built to last

Every unit is designed around robust security and longevity. Multi-point locking engages the sash at several positions to resist forced entry, and reinforced frames add rigidity where it counts.

Weather-resistant gaskets, advanced drainage, and durable finishes mean no sanding, no repainting, and no warping—just an occasional wipe-down to keep them looking their best.

Choose toughened or laminated glazing for rooms that need extra security or safety.

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Made for sensitive settings

Flush aesthetics make these windows a natural choice for character properties and conservation-style refurbishments. Many local authorities recognise the sympathetic appearance of flush casements; if you’re in a listed building or designated conservation area, our team can help with technical details (sightlines, section drawings, and sample swatches) to support your application. Speak with us early and we’ll advise the most appropriate specification for your project.

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Flush fit double-glazed windows installed in a red brick home, featuring a sleek, modern design with excellent insulation.
chartwell green flush window

Why choose us

From survey to installation and aftercare, you’ll get expert advice, precise measuring, and neat, considerate fitting. We’ll guide you through designs, colours, security upgrades, and glazing choices so your new windows look stunning and perform exactly as you expect.

Ready to begin?

  • Book a free home survey to confirm sizes and specifications.
  • Visit our showroom to compare colours, hardware, and woodgrain finishes.
  • Download a brochure for technical details and inspiration.
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