Market-leading windows
Authentic heritage, modern performance
Timberlook uses Timberweld® mechanical joints to replicate classic butt-joints—no visible mitres—so frames and sashes look authentically timber from every angle. Optional concealed trickle vents maintain clean sightlines where background ventilation is required, and a practical night-vent setting allows secure airflow after dark. With a standard 70 mm frame depth, installation is straightforward in typical UK openings.
Transform your home with our stunning flush sash windows that embody both elegance and durability. Crafted to perfection, these windows combine timeless aesthetics with modern 21st century technology, offering you the warmth and charm of traditional casement windows made of timber without the maintenance. Our flush casement windows are beautiful inside and out and are designed to give your home the ultimate wow factor.
Browse the galleryExceptional features of our Timberlook windows
Patented Timberweld Technology
Certified to PAS24 Specifications
Concealed Trickle Vents for An Elegant Look
U-values as low as 1.2W/m2K
What Should You Know About Flush Sash Windows?
This FAQ section addresses key questions about flush sash windows, offering insights into their design, cost, energy efficiency, and overall value. Whether you're planning a home renovation or exploring window options, our answers aim to provide you with the essential information needed to make an informed choice.
Discover the Perfect Flush Sash Windows for Your Home – Contact Us for a Quote TodayWhat is a flush sash window?
A flush sash window is a style of window where the sash— the part of the window that holds the glass—sits flush with the outer frame, creating a smooth, even surface. This design is often used in period properties to maintain a traditional appearance while benefiting from modern materials and performance.
Are flush windows more expensive?
The cost of flush windows can vary depending on factors like materials and customisation options. While they may sometimes be more costly than standard windows due to their bespoke design, it’s advisable to contact us for a tailored quote to meet your specific needs.
What is the difference between flush and casement windows?
The primary difference between flush and casement windows lies in the positioning of the sash. In flush windows, the sash is level with the frame, offering a sleek appearance, whereas in standard casement windows, the sash typically protrudes slightly beyond the frame.
Are flush windows worth it?
Flush windows are a worthy investment for homeowners seeking a combination of traditional aesthetics and modern performance. They offer superior energy efficiency, durability, and can significantly enhance the visual appeal of both period and contemporary homes.
Are flush windows energy-efficient?
Yes, flush windows are highly energy-efficient. Their design helps to minimise heat loss, and when combined with modern glazing options, they can contribute significantly to reducing your energy bills and improving the overall comfort of your home.
Timberweld tech
Innovative technology, modern design
Our Timberlook Flush Sash windows feature a fully sealed design thanks to the innovative Timberweld join. This patented technique combines the beauty of traditional timber butt joints with a variety of woodgrain options and the precision and strength of modern welding. By utilising this complex internal weld technology, we are able to create heritage windows that combine the elegance of traditional design with a secure, weatherproof seal. Multi-chambered uPVC profiles and advanced double or triple glazing deliver excellent thermal performance, with U-values as low as 1.2 W/m²K and A or A+ BFRC energy ratings achievable depending on specification. The result is reduced heat loss, more consistent room temperatures, and lower energy consumption throughout the year.
Energy Efficient Flush Sash Windows (U-values & Ratings)
Security and comfort come as standard. Our uPVC flush casement windows can meet PAS 24 when specified and feature multi-point locking with internally beaded glazing for added peace of mind. Precision gaskets, robust seals, and tested drainage deliver reliable weather resistance and draught-proofing—ideal for the UK’s varied climate.
Contact usConservation-area confidence
Working on a character property or in a conservation area? Timberlook’s authentic detailing, balanced proportions, and period hardware options make these windows a natural choice for sensitive renovations. Our conservation area flush windows help projects blend in sympathetically. Where properties fall under an Article 4 Direction, planning permission may be required—your installer can advise and supply product information to support applications.
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Conservation Areas & Design Options
For sensitive projects, our heritage flush sash windows provide authentic detailing, slim profiles and period hardware choices (Monkey Tail, Pear Drop) that complement listed and character properties. In designated locations, conservation area flush windows are frequently considered appropriate; where an Article 4 Direction applies, planning permission may be required—your installer can advise and provide product data to support applications. Personalise your windows with deep bottom rails, timber-grain foils, and a curated palette of colours to achieve a convincingly timber look flush sash window aesthetic without the upkeep.
Contact UsBuilt for UK regulations
Specify Timberlook to align with current Building Regulations:
Ready to upgrade to flush sash windows?
Book a design consultation and quote. An approved Timberlook specialist will confirm U-values, glazing and hardware, advise on conservation and planning, and install to FENSA-certified standards—delivering beautiful, energy-efficient windows across the UK.
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Concealed trickle vents
Concealed ventilation solutions for your home
You don't have to spoil the appearance of your new windows with unsightly trickle vents anymore. At Timberlook, we have come up with a solution - a head drip that can be attached to the Timberlook outer frame, concealing any external vent canopy. Our concealed trickle vents are designed with both aesthetics and functionality in mind, offering improved air quality while maintaining the sleek look of your windows.
Colours
Heritage Colour & Foil Options
Our Timberlook windows are available in a range of standard colours, woodgrain foils and dual-colour options Our range has been curated to complement everything from period properties to modern homes.
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White
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Polar White
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Cream Foil
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Irish Oak
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Golden Oak
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Rosewood
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Chartwell Green
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Painswick
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Pebble Grey
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Anthracite(Woodgrain)
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Anthracite(Smooth)
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Black Foil
Cills
Choosing the right cill for your Timberlook windows
We offer a choice of cill options to complement your flush sash windows. Choose between the contemporary shallow cill that comes as standard or the Radlington Cill which has been designed to replicate the historic cills seen on traditional timber windows.
85mm Stubb Cills
These small but strong cills are often used for properties with stone cills, having been crafted to ensure that moisture is directed away from the frames, removing the risk of water ingress.
150mm Cills
As the industry’s ‘standard’, these cills protrude 80mm from the front of the frame. They offer long lasting protection, are virtually maintenance free, and come in a choice of colours.
180mm Cills
The 180mm cill is the largest cill we offer, protruding 110mm from the front of the frame. You’ll often find these cills in properties with frames that are recessed in the brickwork.
Radlington 165mm
Cills are usually 30mm deep, but to accurately emulate traditional looking frames, the Radlington cill is slightly thicker at 55mm deep, protruding 95mm from the face of the frame.
Hardware
High quality hardware and optional accessories
As standard, our flush sash windows are equipped with contemporary handles. However, you can customise them even further with our Premium Regency furniture. You have the option to choose from Peardrop and monkey-tail handles to give your windows a unique truly authentic period touch.
Standard Handles
Our sleek window handles fit perfectly with Timberlook windows and won’t interrupt views. They are available in a wide range of colours to perfectly match our windows, and offer smooth and comfortable operation.
Monkey Tail
Inject distinctive character and timeless elegance into Timberlook windows with monkey tail handles. These elegant and durable handles add a touch of vintage charm while providing reliable functionality.
Pear Drop
Transform the look of Timberlook windows with classic and ornate pear drop handles. These handles combine timeless aesthetics with practicality, enhancing the beauty and functionality of our flush casement windows.
Peg/ Dummy Stays
Decorative and functional peg/dummy stays not only add a touch of charm to our Timberlook flush casement windows, but also provide sturdy support, improving the overall window experience.
Find an Installer
Looking for a professional Timberlook installer in your local area?
At Timberlook, we have years of experience connecting homeowners nationwide with quality installers who provide competitive pricing and exceptional customer service.. Get in touch to get connected with your nearest professional Timberlook installer!
What our customers say
Take a look at some amazing feedback from our customers. We’re proud to deliver exceptional service that exceeds customer expectations and leaves them delighted with their homes.
Quality windows that have changed the look of my house completely, reasonably priced, really felt looked after. Ryan is marvellous!!!
Adrian Barliga
A great measure of any business is its aftersale service. The doors were great quality and the aftersales service outstanding. Thankyou to Ryan very helpful
S
What a pleasure to deal with, an excellent 5 star service as always
Russell Dyer