RLM FLUSH SASH WINDOWS
Flush Sash Windows
Our flush sash windows combine contemporary aesthetics with traditional charm, perfect for homes seeking modern performance with classic appeal. Whether you’re renovating a period property or building new, our flush sash windows offer superior energy efficiency, security, and style. These versatile windows sit flush within the frame, creating clean lines that suit both modern and heritage properties. Add heritage bars for an authentic period look, or keep them plain for a sleek, contemporary finish.
Modern flush sash windows can be a striking feature in any contemporary, stylish home. However, by adding something as simple as a heritage bar through the centre of the glass, your flush sash window can be instantly transformed into a period-style design—perfect for a more traditional property and ideal for replicating the look of classic timber windows.
Flush Sash Windows by RLM: Bespoke Design Meets Performance
At RLM Windows, we specialise in bespoke flush sash windows for properties across the North East. Our made-to-measure flush sash windows combine traditional aesthetics with modern energy efficiency, offering homeowners a perfect balance of style, security, and thermal performance. Whether you’re renovating a period property or updating a contemporary home, our flush sash window range provides the flexibility to match your requirements. Flush sash windows remain a popular choice for homeowners seeking a sophisticated, clean-lined aesthetic. They sit flush within the frame, creating seamless sight lines that suit both traditional and modern properties.
Why Choose Flush Sash
Considerable care has been taken to capture the charm and elegance of a traditional timber window, even down to the tactile woodgrain finish, but combine this with the advance low maintenance qualities associated with modern day UPVC windows.
Our bespoke flush sash windows are completely tailored to your exact requirements and are all fully made to measure. We offer a combination of high security, low maintenance, energy-rated windows. Visit our showroom or contact us for a free quote.
Compliance & Safety
On our Flush sash range we offer a choice of Welded finish or mechanical Genus finish. Engineered using traditional joinery techniques, the Genus finish offers milled butt joints to provide the Ultimate timber effect window.
Design Flush Sash Windows That Match Your Home
One of the greatest advantages of choosing RLM flush sash windows is the ability to fully customise every aspect of your design. We understand that every home is unique, and your windows should reflect that. Whether you’re looking for a contemporary aesthetic with clean lines or a traditional period style with heritage bars, our extensive range of options allows you to create windows that are both functional and uniquely yours. From colour selection to hardware finishes, glass types to decorative glazing bars, you have complete control over the final design. Our team can guide you through each decision, or if you prefer a hands-on approach, try our free Window Designer tool to visualise your options.
Product Options
Our flush sash windows come in a variety of colour options and finishes.
Black W Grain Smooth White
Chartwell Green W Grain Smooth White
Cherrywood
Irish Oak
Cherrywood Smooth White
Dark Grey Smooth White
Dark Grey
Dark Grey White Grain
Ice Cream
Ice Cream Smooth White
Irish Oak Smooth White
Spectral Grey Smooth White
Spectral Grey Spectral Grey
Spectral Platinum Smooth White
Spectral Platinum
Light Grey Smooth White
Rosewood
Rosewood Smooth White
Smooth White
White W Grain
Black W Grain Smooth White
Chartwell Green W Grain Smooth White
Cherrywood
Irish Oak
Cherrywood Smooth White
Dark Grey Smooth White
Rosewood
Dark Grey White Grain
Ice Cream
Ice Cream Smooth White
White W Grain
Rosewood Smooth White
Smooth White
The colours shown on our web site are for your guidance only, please ask to see physical samples for a true representation.
Antique Black
Black
Bronze
Chrome
Gold
Graphite
White
Antique Black
Gold
Chrome
Graphite
Antique Black
Gold
Chrome
Graphite
We offer a choice of Flush Sash and Rebated Sash profile options. This can often be influenced by your personal preference and taste. Our standard go to profile is Ultimate Heritage Window.
Ultimate Heritage Window Flush Sash
Ultimate Heritage Window Rebated Sash
Arctic
Autumn
Chantily
Charcoal
Contora
Cotswold
Digital
Everglade
Flemish
Florielle
Mayflower
Minster
Oak
Pelerine
Stippolyte
Sycamore
Taffeta
Warwick
Rehau Windows
Rehau by RLM
Legacy Sliding Sash
Ultimate Modern Collection
Ultimate Heritage Collection
If you want to discuss colour, profile or hardware options please speak to the team on Call 0191 266 8788.
Ready to upgrade to flush sash windows? Contact our team for a free, no-obligation quote.
Why Choose RLM for Your Flush Sash Windows?
When investing in new windows, you’re not just buying a product—you’re choosing a partner for your home improvement project. Here’s what sets RLM apart:
- Fully Bespoke & Made-to-Measure – Every flush sash window is crafted to your exact specifications, ensuring a perfect fit and finish for your property.
- Extensive Customisation – Choose from multiple colours, hardware finishes, glass options, and decorative heritage bars to create windows that reflect your home’s personality.
- Heritage Bar Options – Add a heritage bar through the centre of the glass to transform your flush sash window into a period-style design— replicating the look of classic timber windows.
- Expert Installation & Aftercare – Our highly-rated team handles everything from design consultation to professional installation and ongoing support.
- Trusted Local Installer – With over 15 years of experience, RLM is one of the highest-rated glazing installation businesses in the North East, with excellent reviews on Checkatrade and Google. We are registered with FENSA and offer a 10 year insurance backed Guarantee for your peace of mind.
Frequently Asked Questions
RLM Windows is based in Newcastle upon Tyne and serves the North East region. We install flush sash windows and other products throughout Northumberland, Tyne and Wear, and surrounding areas. Contact us for details on your specific location.
Flush sash window prices vary based on size, materials, customisation options, and your property’s requirements. We offer free, no-obligation quotes tailored to your project. Contact us or visit our showroom to discuss your budget and get an estimate.
Yes! Our showroom is located at Unit 2, Armstrong Drive, Westmoor, Newcastle upon Tyne, NE12 7EB. You can view our flush sash windows and other products in person, including colour samples and hardware options. Our team is available to discuss your project and answer any questions. Call 0191 266 8788 to book an appointment.
Casement windows open outward on hinges and offer excellent ventilation and ease of operation. Flush sash windows sit flush within the frame, creating clean lines that suit both modern and heritage properties. Our team can help you choose the right style for your home.
Why not visit our showroom where you can view our range of products in person. Our team are here to help talk you through any project.
Try Our Window Designer
Want to design and plan your own windows? Then try our free window designer.