Casement
Bespoke uPVC casement windows (aluminium available) built with Eurocell profiles, double or triple glazing and premium glass from Martin Dales and Glasscraft.
Flush Sash Windows: Key Specifications
Browse our profile systems, colours and glazing options below. For full technical drawings, U-values and heritage hardware specs, download the brochure and share it with your team or client.
- Details & Features
- Specifications
- Glazing & Security
- Colours
- Downloads
| Specification | Detail |
|---|---|
| Profile systems | Eurocell Logik (70mm) or Modus (75mm) |
| Joint options | Mitre-welded or mechanical-look |
| U-value (Logik double) | From 1.2 W/m²K |
| U-value (Modus triple) | From 0.7 W/m²K |
| Energy rating | Up to A++ |
| Glazing thickness | 28mm double or 44mm triple |
| Spacer bars | Black or grey warm edge |
| Locking | Multi-point shoot-bolt, PAS24 |
| Gaskets | Post co-extruded PCE seals |
| Warranty | 10 years |
Glazing and security as standard
Sealed units come from Martin Dales and Glasscraft, with toughened, laminated, Low-E and decorative options available. Every flush sash window ships with internal beading and multi-point shoot-bolt locks tested to PAS24 and Secured by Design, keeping draughts and intruders out.
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Colour and finish options
Pick from over 30 foils, including:
- White, Cream, Black, Anthracite Grey
- Agate Grey, Slate Grey, Chartwell Green
- Woodgrain effects: Irish Oak, Golden Oak, Rosewood, White Ash
Dual colours and grey substrates are available on request for a true timber look when the sash is open.
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Download the brochure
Need full specs to price up a job or share with a homeowner? Download our flush sash brochure for complete technical detail, U-values, heritage hardware options and configuration drawings.
Contact UsModern performance, traditional look
Our process is simple. Send us your sizes, get a same-day response and a quote inside 24 hours, with delivery typically within two weeks across Leeds, Harrogate, Pudsey and the wider Yorkshire region.
Flush sash windows are a popular choice for period properties, heritage projects and contemporary homes alike. We build ours bespoke, with mechanical-look joints, Monkey Tail or Pear Drop handles in chrome, pewter or antique bronze for true authenticity.
Why trade installers choose Alpine
Peter and Richard bring nearly 80 years of combined industry experience to every order. We’re family-run, based in Morley, and we deal with traders the way we’d want to be dealt with, direct lines to the people running the business and no messing about.
Whether you need one replacement window or a full heritage refurbishment, we accommodate every order size. Free delivery across Leeds, flexible lead times and fantastic customer service from a friendly team who actually understand what installers need on site.
Flush sash windows: trade FAQs
Quick answers for installers and builders sourcing sash windows from us. For anything not covered, give the trade office a call on 0113 531 3148.
Contact UsMost flush sash orders leave our Morley factory within two weeks of order confirmation. Quotes are turned around inside 24 hours, with same-day responses to trade enquiries on sizes and specs.
Yes. Our uPVC flush sash windows replicate traditional timber sash windows with mechanical-look joints, Astragal bars and heritage handles, making them an excellent choice for Conservation Area projects and listed surrounding areas.
Logik double glazed units achieve U-values from 1.2 W/m²K, while Modus triple glazed can drop as low as 0.7 W/m²K, comfortably exceeding current and future Building Regulations for thermal efficiency.
Yes, they are manufactured with multi-point shoot-bolt locks to secure them at various sections around the frame. If security is the client’s top priority, they can opt for toughened glass alongside this.
Regardless of the building type of your client, commercial or domestic, these windows will have an appropriate finish. More rural or sensitive settings could be foiled with a convincing woodgrain effect, and likewise new builds can choose contemporary looks like anthracite grey. Dual colour options are also available.
How we work with the trade
Our Process
Initial quote
Send us your sizes online or over the phone. We turn most trade quotes around within 24 hours, and there is no obligation to proceed.
Conversation
We talk through the priorities for you or your client, be it design, thermal performance, security, colour finish, glazing, or locking.
Manufacturing
We manufacture in-house at our Morley facility using Eurocell uPVC profiles, DoorCo composite slabs and Alunet aluminium systems. Typical lead time is two weeks.
Bespoke build, testing and supply
Every frame is made to your exact sizes and quality-checked before despatch. Supply only as standard, full installation available on request.
What fellow trade professionals say about us
Honest feedback from the installers, builders and double glazing companies we supply day in, day out.
Had both front and back stable doors fitted recently, and I have to say the men that came to fit them were really good, pleasant, efficient and did a great job! I am really pleased with my doors and the way the men conducted themselves; they are a credit to Alpine – thanks again.
Carol Marshall
I can’t thank the team at Alpine enough for all of the hard work on your build. They were great from the start, being really helpful through the quote process and in advising. The fitting team worked so hard to make sure everything was perfect, and nothing was too much trouble. We are so happy with Alpine. The results really speak for themselves, and we would not hesitate to recommend them to anyone!
Kate Oakes
We recently renovated a small cottage and needed to consider the traditional look and feel of the property, Alpine Windows and Doors were brilliant, listening to our requirements, we ended up with 6 sash windows and a new composite door all in a non standard colour, which was no problem. from placing the order to the completion of the installation nice and smooth, 5 weeks time frame, fitted perfectly with our project, would highly recommend
Tom Crowe
Excellent service from start to finish. They made the process from colours to design easy, nothing was too much trouble. Lovely polite staff and fitters. Fitters turned up on time and finished to an exceptional standard (I am a perfectionist!) left my home clean and tidy and removed all old frames and doors. Couldn’t fault them at any stage and would highly recommend them. I would give more than 5* if I could.
Sarah Wood
Peter at Alpine has done the windows and doors at both our offices and my home. The service was very professional, fast and competitive price wise. I had a combination of Aluminium bi folds and French doors with UPVC windows. I cannot fault the quality. Very happy to recommend for both domestic and commercial projects.
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