Flush Sash Windows

What are Flush Sash Windows?

Also known as flush casement windows, flush sash windows have sashes which end flush with the window’s external face. When shut, the window sash is level with the outer frame, making for consistently smooth exterior contours.

The inside of the window looks fairly like any regular side-opening casement window commonly found on modern UK homes.

This design can recreate the appearance of traditional wooden casement windows but with the benefit of twenty-first century technology for optimal performance. The look is incredibly authentic.

BENEFITS OF CASEMENT WINDOWS

With uPVC flush sash windows, you have the advantages of low-maintenance, attractive and thermally-efficient alternatives to wood with a product that’s 100% recyclable. The slim profiles blend seamlessly into any property style or period. Add elegance to your home with these home improvements.

These models are highly secure, giving you real peace of mind.

OUR FLUSH SASH WINDOWS FROM PLATINUMNRG

Take a closer look at our flush sash, 70mm profile timber-alternative uPVC windows from Platinum NRG.

These products come with a great choice of hardware options and an array of colours and styles with a chamfered or sculptured finish.

The multi-point locking system makes these products seriously secure, while the internal glazing also enhances security. These products are certified ‘Secured by Design’ by the Association of Chief Police Officers. There’s double-glazed energy glass which maximises incoming light with an ‘A’ energy score.

The high-impact modified uPVC used has a polished gloss finish to reduce cleaning and maintenance,  while these models also resist mould, cracking and extreme cold and the material is 100% free from lead.

With its high-tech, six-chamber frame and four-chamber sash design fashioned from superbly strong structured uPVC. We’re confident this flush sash model is one of the best-performing products you’ll find on today’s market, offering ultimate heat and sound retention.

Posted on Google Google
Barrie Horsted
15 June 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Great service. The team arranged scaffolding to go over the conservatory.the technitians worked in the worst weather every but completed a quality job
Posted on Google Google
Alexander Waters
28 May 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
I was very pleased with the service here. The quote was done very quickly and the price was fair, given you are paying for quality. Lots of help with answering my questions, and most importantly, when it came to fitting, the fitter was experienced and really took care of the work at hand.
Posted on Google Google
Roger Britt
12 May 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Very good job done, very pleased with our new windows, work was done quickly and very tidily, excellent job all round,
Posted on Google Google
Sam Andrews
7 May 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Fantastic service and product, extremely happy customer - would highly recommend!
Posted on Google Google
Ali Burt
27 April 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
An excellent company to deal with. The team particular Alex, Sarah and Liz, were helpful in everyway. Keep up the good work.
Posted on Google Google
Steve Barnes
27 February 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
5* service the whole way through, from initial quote to installation. The fitter done a fantastic job, and the finished result looks incredible
Posted on Google Google
Phil N
18 February 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Friendly, positive and helpful staff with good products and fast turnarounds
Posted on Google Google
Traci Chaney
4 February 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Excellent workmanship. All workmen very polite and respectful. All worked really hard, in all weathers. Cleaned up as they went along. Very pleased with work carried out.
Posted on Google Google
Gina Stokes
7 January 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Really personal service. Professional job.
Posted on Google Google
Marc Mosthav
11 December 2025
Google star 1Google star 2Google star 3Google star 4Google star 5
Great service. Friendly, prompt and knowledgable.

FLUSH SASH WINDOWS TO YOUR SPECIFICATION

Our Flush Sash Windows can be tailored to match your home and style, choose from different finishes, features, handles and more!

Security

With bi-directional roller locks and shootbolts, our windows keep you safe and secure and hold the Secured by Design Certification.

FIND OUT MORE

Finishes

We offer a wide range of woodgrain and coloured foil options, both internally and externally or even differing frames and sashes.

FIND OUT MORE

Handles

We have a wide selection of window handles from traditional brass through to contemporary steel to enhance your window design.

FIND OUT MORE

Guarantee

Flush Sash Windows come with a 10-year guarantee. Any issues related to the manufacture or installation will be repaired or replaced.

FIND OUT MORE

DOOR DESIGNER

Design your perfect windows with our easy-to-use casement window designer

VISIT OUR SHOWROOM

Visit our showroom and see our whole range of windows and doors!

LET'S HAVE A CHAT

Visit our showroom and see our whole range of windows and doors!

Flush Sash Windows FAQs

What are flush sash windows?

Flush sash windows, also known as flush casement windows, are windows in which the sashes end flush with the window’s external face, creating a smooth and consistent exterior contour.

How do flush sash windows differ from regular casement windows?

Regular casement windows have sashes that protrude from the frame when closed. Flush sash windows have sashes that end flush with the frame, creating a smooth exterior contour.

What are the benefits of flush sash windows?

Flush sash windows offer the advantage of low-maintenance, attractive and thermally-efficient alternatives to wood with a product that’s 100% recyclable. They are highly secure, giving you real peace of mind and also can recreate the appearance of traditional wooden casement windows but with the benefit of twenty-first century technology for optimal performance.

Are flush sash windows low-maintenance?

Yes, flush sash windows are low maintenance. The uPVC material used in these windows is durable and does not require regular painting or staining like wood.

How secure are flush sash windows?

Our flush sash windows are highly secure. They feature a multi-point locking system and internal glazing, and are certified ‘Secured by Design’ by the Association of Chief Police Officers.

What material are flush sash windows made of?

Our flush sash windows are made of uPVC, a durable and low-maintenance material that is also 100% recyclable.

Can flush sash windows be customized to match my home's style?

Yes, flush sash windows can be customized to match your home’s style. We offer a wide range of finishes, features, handles, and customization options to tailor your flush sash windows to your personal style.

What kind of glass do flush sash windows use?

Our flush sash windows use double-glazed energy glass which maximizes incoming light with an ‘A’ energy score.

Are flush sash windows energy-efficient?

Yes, flush sash windows are energy-efficient. The high-tech, six-chamber frame and four-chamber sash design of our flush sash windows provide ultimate heat and sound retention.

Is there a guarantee for flush sash windows?

Yes, flush sash windows come with a 10-year guarantee. Any issues related to the manufacture or installation will be repaired or replaced.