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Flush Sash Windows in Brighton & Sussex
Flush sash windows replicate the appearance of original timber casement windows while delivering exceptional energy efficiency. Their clean, flush finish creates a classic design perfect for both period properties and new builds.
Available with double glazing or triple glazing, these uPVC windows combine period charm with modern technology. They’re low maintenance, thermally efficient, and built with the highest quality materials for lasting performance.
Why choose flush sash windows?
Period charm
A classic flush window style with authentic details suited to conservation projects and heritage homes.
Exceptional energy efficiency
Achieves 1.8 W/m²K and WER A+ with double glazing, with triple glazing also available.
Low maintenance
uPVC flush sash windows replicate timber but need minimal upkeep, unlike wood.
Modern performance
Six-chambered design with optional seals ensures thermal efficiency and durability.
Various styles
Options include deep bottom rails, dummy sashes, mechanical joints and traditional hardware.
Trusted installation
We provide flush sash window installation across Sussex using quality materials and years of experience.
- Colours
- Glazing
- Downloads
Traditional and modern finishes
Choose from a wide range of finishes, from heritage shades like Chartwell Green and Irish Oak to contemporary greys and dual colour options.
Contact UsGlazing options for thermal efficiency
Flush sash windows achieve WER A+ and 1.8 W/m²K with double glazing. Triple glazing is also available for added performance, helping improve insulation and reduce energy bills.
Double or triple glazing available
WER A+ with double glazing
Thermal efficiency built into every frame
Designed to meet the specific needs of heritage and modern homes
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Download our brochure
View our flush sash windows brochure for full specifications, colours, and style of window options.
What are flush sash windows?
Flush sash windows are a style of window where the sash sits level with the frame, creating a flat, seamless finish. This design mirrors original timber casement windows while offering the durability and low maintenance of uPVC windows.
They bring period charm to replacement windows or new builds, combining classic design with modern technology such as multi-chambered frames and advanced weather seals for thermal efficiency.
Perfect for heritage and modern homes
These flush windows are particularly suited to period properties, cottages, and conservation projects where maintaining original style matters. At the same time, their clean lines also suit new build developments looking for contemporary design.
Combining period charm with modern technology, our flush sash window installation service across Brighton and Sussex ensures the highest standards, minimal disruption, and long-lasting results for every type of home.
Flush Sash Windows FAQs
Here are answers to some of the most common questions we receive about our flush sash windows.
find out moreFlush sash windows feature sashes that sit level with the frame, creating a flat, seamless look similar to traditional timber casement windows.
Our flush sash windows achieve WER A+ and 1.8 W/m²K with double glazing. Triple glazing is also available for improved thermal efficiency.
Yes, their classic design is ideal for conservation projects and heritage homes, with details such as deep bottom rails and period-style hardware.
Yes, unlike timber, uPVC flush sash windows need minimal maintenance while keeping their appearance for years.
We carry out flush sash window installation across Brighton, Hove, and the wider Sussex area.
Your Journey with Us
Explore Your Options
Browse our range of options to find the right fit for your home improvement project.
Your Journey with Us
Free Consultation
Contact us, and our team will offer clear advice, helping you choose the perfect solution for your specific needs.
Your Journey with Us
Professional Installation
Our reliable expert installation team delivers a smooth, efficient service with minimal disruption.
Your Journey with Us
Aftercare & Support
We’ll make sure everything works as intended and leave you nothing short of delighted with your finished home improvement project.
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Hear from our customers
Read how other homeowners rate our products, service, and results across Brighton and Sussex.
All round great service
Excellent service from Premier Windows. Totally reliable and well managed. Paul is always very helpful and good communicator. All round great service.
Read moreJudith Elliott
I will be using your services again
Had a new door and window fitted into my new kitchen extension. The fitter was first class and the product and installation excellent. Can't believe the light it's brought into...
Read moreJohn R
We would recommend
We are extremely happy with the double glazing fitted this week by Premier Windows, our 4 bedded house completed in 3 days with minimal dust or disruption. Terry and Daryl...
Read moreDanise L
Couldn’t have asked for better quality
Thank you so much our bifold doors and new front door are truly amazing. Couldn't have asked for better quality, service or price. We will definitely be going back when...
Read moreVenos
I would not hesitate in recommending them
I purchased a new-build property two years ago. The excellent quality windows and doors were installed by Premier Windows. The company also offers a first class response in the unlikely...
Read moreRobert L
Really good and reliable company
I bought the exterior door and I love it. Phil from the sales department offered me several solutions to make me happy with colours, materials and prices. He followed me...
Read moreStefanial
All round great service
Excellent service from Premier Windows. Totally reliable and well managed. Paul is always very helpful and good communicator. All round great service.
Judith Elliott
I will be using your services again
Had a new door and window fitted into my new kitchen extension. The fitter was first class and the product and installation excellent. Can’t believe the light it’s brought into the space and the difference its made. The whole job was completed in a morning without any mess. I will be using your services again.
John R
We would recommend
We are extremely happy with the double glazing fitted this week by Premier Windows, our 4 bedded house completed in 3 days with minimal dust or disruption. Terry and Daryl were polite and helpful and all dealings with the company were very satisfactory the price was actually less than expected. We would recommend.
Danise L
Couldn’t have asked for better quality
Thank you so much our bifold doors and new front door are truly amazing. Couldn’t have asked for better quality, service or price. We will definitely be going back when we replace our windows!
Venos
I would not hesitate in recommending them
I purchased a new-build property two years ago. The excellent quality windows and doors were installed by Premier Windows. The company also offers a first class response in the unlikely event of a problem. I would not hesitate in recommending them.
Robert L
Really good and reliable company
I bought the exterior door and I love it. Phil from the sales department offered me several solutions to make me happy with colours, materials and prices. He followed me through the entire process and always answered all my questions and concerns. With him, I obtained a colour that was not that easy to get from other companies.
The installation team was also really nice. In particular, there was a guy from Bulgaria who did an amazing job in a couple of hours and left everything nice and clean.
I would definitely recommend this company 🙂
Stefanial
