Flush windows offer a flat, seamless appearance that standard casements can't match. The sash sits level with the outer frame — popular on contemporary new builds, barn conversions, and self-builds across Tyne and Wear.
Get Your Free QuoteThe sash face sits level with the outer frame — no raised rebate, no shadow line. A cleaner, more architectural appearance than a standard casement.
The same high-performance profiles and argon-filled glazing units as our standard casements — flush construction doesn't compromise thermal performance.
Available in both uPVC and aluminium frames — giving you a choice between the warmth and value of uPVC or the ultra-slim sightlines of aluminium.
The architectural choice for homeowners who want something cleaner. Installed across Sunderland and Tyne and Wear by Range Windows
Superior Kerb Appeal
The flat-faced profile gives properties a more refined, architectural finish. Particularly effective on grey or anthracite coloured frames where shadow lines would detract from a contemporary look.
Works with Heritage Planning
The flush profile more closely replicates traditional timber window proportions, making it a viable option in some conservation areas where standard casements may not be appropriate.
Same Performance as Standard Casements
Flush construction uses the same high-performance glazing and multi-point locking hardware — you get the aesthetic upgrade without any compromise on insulation, security, or durability.
The term "flush window" covers two distinct styles. Both share the flat-faced profile, but they operate differently and suit different property types.
Side-hinged and outward-opening — the same operation as a standard casement, but with the sash face sitting level with the outer frame. The most popular flush window choice for contemporary new builds and extensions.
A vertical sliding sash window with a flush external profile. Combines the traditional operation of a sash window with the clean flat appearance of flush construction — suited to period homes where planning or aesthetic requirements demand a more traditional feel.
For ultra-slim sightlines and a premium finish, our aluminium flush windows deliver the flat-faced profile with even narrower frames than uPVC. Popular on high-end builds and large glazed elevations.
Available across the full colour range — anthracite grey and black flush windows are particularly popular for contemporary properties. Dual-colour options (different inside and outside) are available on both uPVC and aluminium.
Book a free home survey — no obligation, no pressure.
Get a Free QuoteCommon questions from homeowners across Sunderland and Tyne and Wear.
A flush window is one where the opening sash sits level with the outer frame, rather than projecting proud of it as a standard casement does. This creates a flat, seamless appearance suited to contemporary, barn-style, and timber-frame properties. Available in both uPVC and aluminium.
On a standard casement, the sash sits proud of the outer frame by around 15–20mm, creating a visible shadow line. On a flush window, the sash face is level with the frame for a flat, uniform appearance. Both operate identically — the difference is entirely aesthetic.
Flush windows carry a modest premium over standard casements due to the specialist profiles required. The difference is generally a small percentage of the overall installation cost. We provide full pricing in your free, no-obligation quote.
Yes. Flush uPVC windows use the same multi-chambered profiles, argon-filled glazing, and warm-edge spacer bars as standard casements — achieving A-rated thermal performance. The flush construction has no impact on energy efficiency.
Flush windows suit contemporary new builds, barn conversions, self-builds, and any property where a clean flat-faced appearance is preferred. They also work well on period properties where planning guidelines require minimal projection — let us know during the free survey if any restrictions apply.
Yes — anthracite grey is one of our most popular flush window colours. The flat profile and darker frame combine particularly well for a contemporary look. We also offer black, white, cream, and a full range of woodgrain foils, plus dual-colour options.
Contact us today for a free, no-obligation quote on flush windows in Sunderland.
Get Your Free Quote134 reviews on Google
Lisa Young
4 months ago
Fantastic experience with Lee from Range Windows. Prompt efficient service, windows swiftly measured up and date of installation agreed. Call on the day of installation to confirm the time and Lee arrived as agreed. Fab installation and exceptionally happy with the product. Will definitely recommend.
Keira Hunter
This week
Had a new door fitted by Range Windows and Doors today, door looks amazing and service was brilliant. Everything was all cleaned up after the job was finished too which was a bonus. Highly recommended.
Taryn Cotton
This week
Definitely recommend this company! Service is 5 star, they try to help any way they can. Fitting me in to fit a low profile door so my wheelchair could get in my new home. The door is easy to work, draft free and feels very secure and solid. A very caring genuine company which is hard to find nowadays.
Deborah Younger Martin
A month ago
Excellent service, friendly, helpful, arrived when they said they would, and cleaned up after themselves. Can't recommend enough.
Stephen Raine
A month ago
Adam and Brad came early, on time and got to work straight away. They worked hard, fitting 3 new bedroom windows then a back door — all finished in the day. Every item was installed well. They cleaned up everything inside and out, taking all rubbish away with them. Thank you for your good work.
Sye
2 months ago
Within a day Adam came to the house for a free quote — no pressure, no rush. Very professional and we chose this company just from how Adam represented them. Lee measured everything up within days, giving honest advice where other companies were saying to replace everything. Outstanding service.
Jessica Campbell
2 months ago
I couldn't recommend these guys enough! Service was spot on start to finish. Lee and the guys are so knowledgeable about their products, even dropping off brochures so I could make a decision in my own time. No pressured sales, just down to earth people. Adam and Brad fitted the door — so professional.
Aaron Harfield
A month ago
Amazing job, could not ask for more from Lee and Adam.
Get in touch — and see why homeowners trust Range Windows with their home.
info@rangewindows.co.uk
0191 375 8531
Unit 13
Pennywell Business Centre
Sunderland
SR4 9AR
Monday – Friday: 8:00am – 6:00pm
Tell us a bit about your project and we'll get back to you within 24 hours.
